GENERAC GEN-CXSW100A301 PWRcell Automatic Transfer Switch Instruction Manual
- June 9, 2024
- Generac
Table of Contents
GEN-CXSW100A301 PWRcell Automatic Transfer Switch
Product Information: PWRcell Automatic Transfer Switch
The PWRcell Automatic Transfer Switch is available in three
different models: CXSC100A3 (Non-service Entrance Rated),
CXSW100A3 (Service Entrance Rated with Utility Service Circuit
Breaker), and CXSW200A3* (Service Entrance Rated with Utility
Service Circuit Breaker). The transfer switch includes a data decal
and enclosure, and is equipped with load management options and a
PWRcell ATS Controller. It also features a Smart Management Module
(SMM) and a utility service circuit breaker (if equipped).
Product Usage Instructions:
Section 1: Safety
Before using the PWRcell Automatic Transfer Switch, carefully
read the safety rules and warnings in Section 1 of the installation
manual. Ensure that you understand the electrical and general
hazards that come with using the product.
Section 2: General Information
To begin using the transfer switch, follow the unpacking
instructions provided in Section 2. Familiarize yourself with the
equipment description and transfer switch mechanism. Ensure that
you understand the safe use of the transfer switch before
proceeding.
Section 4: Operation (ESS-Only)
If you are using the PWRcell Automatic Transfer Switch for
Emergency Solar Storage (ESS) only, refer to Section 4 of the
installation manual for instructions on manual operation. This
includes steps for operating the transfer switch close to the
utility source side, close to the inverter source side, and
returning to the utility source side.
Section 5: Generator Integration
If you are integrating a generator with the PWRcell Automatic
Transfer Switch, refer to Section 5 of the installation manual for
instructions on generator integration. This includes information on
configuration options, replacing fuses in the PWRcell inverter for
generator integration, and controlling the air conditioner
load.
Regular maintenance of the transfer switch is recommended, and
instructions on how to test the PWRcell ATS Controller and Smart
Management Module (SMM) are provided in the manual. For additional
assistance or information, contact Generac at
888-436-3722 or visit
their website at www.generac.com. Remember to register your product
at https://register.generac.com and save the manual for future
reference.
Installation Manual
For PWRcell® Automatic Transfer Switch
100 200 Amp, Service Entrance / 100 amp Non-Service Entrance
Model Number CXSC100A3 (Non-service Entrance Rated) CXSW100A3 (Service
Entrance Rated with Utility Service Circuit Breaker) CXSW200A3* (Service
Entrance Rated with Utility Service Circuit Breaker)
SERIAL NUMBER: _____ DATE
PURCHASED:____ Register your product at
https://register.generac.com
WWW.GENERAC.COM 888-436-3722
Para español , visita: http://www.generac.com/service-support/owner-support
Pour le français, visiter : http://www.generac.com/service-support/owner-
support
SAVE THIS MANUAL FOR FUTURE REFERENCE
WARNING
CANCER AND REPRODUCTIVE HARM www.P65Warnings.ca.gov.
(000393a)
ii
PWRcell Automatic Transfer Switch Installation Manual
Table of Contents
Section 1: Safety
Section 4: Operation (ESS-Only)
Introduction ………………………………………………….1 Functional Tests and Adjustments ……………… 15
Safety Rules …………………………………………………1 Electrical Hazards …………………………………………2 General Hazards …………………………………………..3
Manual Operation ………………………………………. 15 Close to Utility Source Side …………………………………15 Close to Inverter Source Side …………………………….. 16 Return to Utility Source Side ………………………………. 16
Section 2: General Information Applications …………………………………………………5
Voltage Checks ………………………………………….. 16 Utility Voltage Checks ………………………………………..16 Inverter Voltage Checks …………………………………….. 16
Unpacking ……………………………………………………5 PWRcell System Voltage Tests …………………… 16
Equipment Description …………………………………5 Maintenance ………………………………………………. 17
Transfer Switch Mechanism ………………………….5 Utility Service Circuit Breaker (if
equipped) ……………..6
Transfer Switch Data Decal …………………………..6 Transfer Switch Enclosure
……………………………6
Testing the PWRcell ATS Controller …………… 17 PWRcell ATS Controller Fuse Service ………… 17 Testing the SMM ………………………………………… 17
Safe Use of Transfer Switch ………………………….6
Load Management Options ……………………………6 PWRcell ATS Controller ……………………………………….6
Smart Management Module (SMM) ……………………….7 Application Considerations
……………………………………7
Section 5: Generator Integration
Generator Integration Overview ………………….. 19
Configuration Options ……………………………….. 19 Replace Fuses in PWRcell Inverter for
Generator Integration ………………………………………………………..19
Section 3: Installation (ESS-Only) Introduction to Installation ……………………………9
Inverter Compatibility ……………………………………9 Mount the Enclosure …………………………………….9
Open Enclosure ……………………………………………9 Connect Utility and Standby Power Sources
..10 Connect the Inverter ATS Control Cable ………11 Connect the Current
Transformers (CTs) ……..14 Connect Air Conditioner Loads ……………………14
Control of Air Conditioner Load ……………………………14 Configure the Inverter
…………………………………14 Apply Fault Current Label ……………………………14
Installation ………………………………………………… 20 Flexible Coverage ……………………………………………..20
Whole Home Backup …………………………………………. 20
Setup and Commissioning …………………………. 21 Wiring Checklist …………………………………………………21
Activate the Generac Home Standby Generator …….22 Validate Powering the Home
with the Generator Only ………………………………………………………………… 22 Commission the PWRcell
System ………………………..22 Validate Inverter and Battery Firmware Versions …… 23
Configure Inverter Settings for Generator Integration
………………………………………………………..23 Generator Control Modes …………………………………… 24 Generator
Manual Override Commands ……………….24 Validate Charging the ESS from the
Generator ……..25 Validate Powering the Home with the ESS Only …….25 Set Auto
Control ……………………………………………….. 25 Validate Return to Grid Connected Operation
……….. 25
PWRcell Automatic Transfer Switch Installation Manual
Section 6: Troubleshooting Troubleshooting ………………………………………… 27 Error Codes
……………………………………………….. 28
1
Section 7: Drawings and Diagrams
Installation Drawings …………………………………..29 No. 0G6832-A: 100 A SE & non-SE /
150-200 A non-SE …………………………………………………………… 29
No.10000012171-A: 150 / 200 A SE ……………………. 30
Interconnection Drawings ……………………………30 No. A0001501194 (Part 1 of 4) —
INTERCONNECTION XFER SW 100-200 A — PWRcell Inverter …………… 31
No. A0001501194 (Part 2 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell
Inverter …………… 32
No. A0001501194 (Part 3 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell
Inverter …………… 33
No. A0001501194 (Part 4 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell
Inverter …………… 34
2
PWRcell Automatic Transfer Switch Installation Manual
Safety
Section 1: Safety
Introduction
Thank you for purchasing a Generac product. This unit has been designed to
provide high performance, efficient operation, and years of use when
maintained properly.
WARNING
Consult Manual. Read and understand manual completely before using product.
Failure to completely understand manual and product could result in death or
serious injury. (000100a)
Read this manual thoroughly and understand all of the instructions, cautions,
and warnings before using this equipment. If any section of the manual is not
understood, contact your nearest authorized dealer, or contact Generac
Customer Service at www.Generac.com, or call
888-436-3722 with any questions or
concerns.
The owner is responsible for proper maintenance and safe use of the equipment.
Before operating or servicing this transfer switch:
· Study all warnings in this manual and on the product carefully.
· Become familiar with this manual and the unit before use.
· Refer to the installation sections of the manual for instructions on final
assembly procedures. Follow the instructions completely.
Save these instructions for future reference. ALWAYS supply this manual to any
individual that will use this equipment.
The information in this manual is accurate based on products produced at the
time of publication. The manufacturer reserves the right to make technical
updates, corrections, and product revisions at any time without notice.
DANGER
Indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
(000001)
WARNING
Indicates a hazardous situation which, if not avoided, could result in death
or serious injury.
(000002)
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor
or moderate injury.
(000003)
NOTE: Notes contain additional information important to a procedure and will
be found within the regular text of this manual. These safety alerts cannot
eliminate the hazards that they indicate. Common sense and strict compliance
with the special instructions while performing the action or service are
essential to preventing accidents.
Safety Rules
The manufacturer cannot anticipate every possible circumstance that might
involve a hazard. The alerts in this manual, and on tags and decals affixed to
the unit, are not all inclusive. If using a procedure, work method, or
operating technique that the manufacturer does not specifically recommend,
verify that it is safe for others and does not render the equipment unsafe.
Throughout this publication, and on tags and decals affixed to the unit,
DANGER, WARNING, CAUTION, and NOTE blocks are used to alert personnel to
special instructions about a particular operation that may be hazardous if
performed incorrectly or carelessly. Observe them carefully. Alert definitions
are as follows:
PWRcell Automatic Transfer Switch Installation Manual
1
Safety
Electrical Hazards
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
DANGER
Electrocution. Water contact with a power source, if not avoided, will result
in death or serious injury.
(000104)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000145)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000237)
DANGER
Electrocution, equipment and property damage. Handle
transfer switches carefully when installing. Never install
a damaged transfer switch. Doing so could result in
death or serious injury, equipment and property
damage.
(000195)
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
(000123)
DANGER
Electrocution. Do not disable or modify the connection box door safety switch.
Doing so will result in death or serious injury.
(000157)
DANGER
Automatic start-up. Disconnect utility power and render unit inoperable before
working on unit. Failure to do so will result in death or serious injury.
(000191)
DANGER
Equipment malfunction. Installing a dirty or damaged transfer switch will
cause equipment malfunction and will result in death or serious injury.
(000119)
WARNING
Electric shock. Only a trained and licensed electrician should perform wiring
and connections to unit. Failure to follow proper installation requirements
could result in death, serious injury, and equipment or property damage.
(000155a)
CAUTION
Equipment damage. Verify all conductors are tightened to the factory specified
torque value. Failure to do so could result in damage to the switch base.
(000120)
CAUTION
Equipment damage. Perform functional tests in the exact order they are
presented in the manual. Failure to do so could result in equipment damage.
(000121)
CAUTION
Equipment damage. Exceeding rated voltage and
current will damage the auxiliary contacts. Verify
that voltage and current are within specification
before energizing this equipment.
(000134a)
2
PWRcell Automatic Transfer Switch Installation Manual
General Hazards
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000237)
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
(000123)
DANGER
Electrocution. Water contact with a power source, if not avoided, will result
in death or serious injury.
(000104)
DANGER
Electrocution. Do not wear jewelry while working on this equipment. Doing so
will result in death or serious injury.
(000188)
DANGER
Electrocution. Only authorized personnel should access transfer switch
interior. Transfer switch doors should be kept closed and locked. Failure to
do so will result in death or serious injury. (000213)
DANGER
Automatic start-up. Disconnect utility power and render unit inoperable before
working on unit. Failure to do so will result in death or serious injury.
(000191)
Safety
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000145)
WARNING
Loss of life. This product is not intended to
be used in a critical life support application.
Failure to adhere to this warning could result
in death or serious injury.
(000209b)
WARNING
Equipment damage. This unit is not intended for use as a prime power source.
It is intended for use as an intermediate power supply in the event of
temporary power outage only. Doing so could result in death, serious injury,
and equipment damage.
(000247a)
· Competent, qualified personnel should install, operate and service this
equipment. Adhere strictly to local, state and national electrical and
building codes. When using this equipment, comply with regulations established
by the National Electrical Code (NEC), CSA Standard; the Occupational Safety
and Health Administration (OSHA), or the local agency for workplace health and
safety.
· If working on this equipment while standing on metal or concrete, place
insulative mats over a dry wood platform. Work on this equipment only while
standing on such insulative mats.
· Never work on this equipment while physically or mentally fatigued.
· Any voltage measurements should be performed with a meter that meets UL3111
safety standards, and meets or exceeds overvoltage class CAT III.
PWRcell Automatic Transfer Switch Installation Manual
3
Safety
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4
PWRcell Automatic Transfer Switch Installation Manual
Section 2: General Information
General Information
Applications
The PWRcell® Automatic Transfer Switch (ATS) can be utilized in conjunction
with a PWRcell system, with or without an integrated generator. A PWRcell
Inverter with a PWRcell Battery attached will be referred to as a PWRcell
Energy Storage System (PWRcell ESS), or ESS herein.
When used with a PWRcell ESS alone, the PWRcell ATS enables the entire home to
be powered from the ESS, within the limits of it’s power capacity. To ensure
your PWRcell system is protected from being overloaded, see Load Management
Options. The PWRcell ATS can also be used to integrate a PWRcell ESS with a
compatible Generac Automatic Home Standby Generator. For more information see
Section 5:Generator Integration. For more information, and to access the most
up to date version of this installation manual, visit http:// www.generac.com
/service-support/owner-support.
Unpacking
Carefully unpack the transfer switch. Inspect closely for any damage that
might have occurred during shipment. The purchaser must file with the carrier
any claims for loss or damage incurred while in transit.
Check that all packing material is completely removed from the switch prior to
installation.
The kit should include:
· Manual Operation Handle
· Storage Bracket for Manual Operation Handle
· Fault Current Label
· Two 3.15 A Fuses (to be installed in the PWRcell Inverter for AC Generator
Integration)
Transfer Switch Mechanism
See Figure 2-1. This switch is used with a single-phase system when the
single-phase neutral line is to be connected to a neutral lug and is not to be
switched.
Solderless, screw-type terminal lugs are standard.
The conductor size range is as follows:
Switch Rating
100 A
200 A
Wire Range
14-1/0 AWG (Cu/Al) #6-250 MCM (Cu/Al)
Conductor Tightening Torque
50 in-lbs (5.6 Nm)
275 in-lbs (31 Nm)
This transfer switch is suitable for control of motors, electric discharge
lamps, tungsten filament and electric heating equipment where the sum of motor
full load ampere ratings and the ampere ratings of other loads do not exceed
the ampere rating of the switch and the tungsten load does not exceed 30
percent of the switch rating.
This UL listed transfer switch is for use in optional standby systems only
(NEC article 702).
A 100 A rated switch is suitable for use on circuits capable of delivering not
more than 10,000 RMS symmetrical amperes, 250 VAC maximum, when protected by a
100 A maximum circuit breaker (Siemens types QP or BQ) or 100 A maximum
circuit breaker (Square D Q2, Westinghouse CA-CAH, General Electric TQ2 and
Siemens QJ2).
A 200 A rated switch is suitable for use on a circuit capable of 22,000 RMS
symmetrical amperes, 240 VAC when protected by a circuit breaker without an
adjustable short time response or by fuses.
C
A
Equipment Description
This automatic transfer switch is used for transferring electrical load from a
utility (normal) power source to a PWRcell system or generator as an optional
(standby) power source.
Transfer of electrical loads occurs automatically when there is a significant
reduction or interruption in power provided from the utility grid.
The transfer switch prevents electrical backfeed between the main utility
power and the optional standby power source (generator or ESS).
The transfer switch consists of a transfer mechanism, utility service
disconnect circuit breaker (if equipped), and a PWRcell ATS Controller for
control wiring and management of HVAC loads.
D B
E 000219
Figure 2-1. Typical Single-Phase ATS Transfer Mechanism
A
Utility Closing Coil
B
Standby Source Closing Coil
C
Utility Lugs (N1 & N2)
D
Standby Source Lugs (E1 & E2)
E
Load Lugs (T1 & T2)
PWRcell Automatic Transfer Switch Installation Manual
5
General Information
Utility Service Circuit Breaker (if equipped)
The utility service and generator disconnect circuit breakers for 100 A models
are:
· Type BQ, 2-pole · 10,000 A/C · 120 / 240 VAC, 100 A · 50 / 60 Hertz · Wire
range: #1 – #8 AWG (Cu/Al) · The conductor tightening torque is 50 in-lbs.
(5.6
Nm). The utility service circuit breakers for 200 A models are:
· Type 225AF, 2-pole · 22,000 A/C · 120 / 240 VAC, 150 A / 200 A · 50 / 60
Hertz · Wire range:
Line: 300 MCM – 6 STR (Cu/Al)
Load – ATS: 250 MCM – 6 STR (Cu/Al)
· The conductor tightening torque is: Line: 375 in-lbs (42.4 Nm) Load –
ATS: 275 in-lbs. (31 Nm)
Transfer Switch Data Decal
A data decal is permanently affixed to the transfer switch enclosure. Use this
transfer switch only with the specific limits shown on the data decal and on
other decals and labels that may be affixed to the switch. This will prevent
damage to equipment and property. When requesting information or ordering
parts for this equipment, make sure to include all information from the data
decal. For future reference, record the Model and Serial numbers in the space
provided on the front cover of this manual.
Transfer Switch Enclosure
The standard switch enclosure is a National Electrical Manufacturer’s
Association (NEMA) and UL 3R type enclosure. UL and NEMA 3R (indoor / outdoor
rated) type enclosures typically provide a degree of protection against
falling rain and sleet and, are undamaged by the formation of ice on the
enclosure.
Safe Use of Transfer Switch
WARNING
Consult Manual. Read and understand manual completely before using product.
Failure to completely understand manual and product could result in death or
serious injury. (000100a)
Before installing, operating, or servicing this equipment, read the Safety
Rules carefully. Comply strictly with all Safety Rules to prevent accidents
and / or damage to the equipment. The manufacturer recommends that a copy of
the Safety Rules be posted near the transfer switch. Also, be sure to read all
instructions and information found on tags, labels, and decals affixed to the
equipment. Two publications that outline the safe use of transfer switches are
the following:
· NFPA 70; National Electrical Code
· UL 1008: Standard for Safety–Automatic Transfer Switches
NOTE: It is essential to use the latest version of any standard to guarantee
correct and current information.
Load Management Options
Load management systems are designed to work together to prevent a generator
or PWRcell system from being overloaded by large appliance loads. A PWRcell
ATS Controller is provided as standard equipment with this switch. Smart
Management Modules (SMMs) are available as an additional option for load
management (sold separately).
PWRcell ATS Controller
The controller has four load management circuits for air conditioning (A/C)
loads. The four load management circuits are numbered 1 to 4 and correspond to
a priority level (descending in priority order). The controller manages the
loads by shedding the connected loads in the event of a drop in system
frequency (overload). For assistance with system design please call Generac
Clean Energy Inside Sales,
1-855-635-5186, ext 1861. See Figure
2-2. A/C Priorities 1 4 (A) have connections for an air conditioner. To
control an air conditioner, no additional equipment is required. Internal
normally closed relays interrupt the 24 VAC thermostat control signal to
disable the air conditioner load. Four LEDs, located on the PWRcell ATS
Controller (B), illuminate when a load is connected and powered. See Figure
2-2. The controller has a test button (C) used to simulate an overload
condition. This button operates even when the transfer signal is inactive.
6
PWRcell Automatic Transfer Switch Installation Manual
General Information
C
B A
011166
Figure 2-2. PWRcell ATS Controller Smart Management Module (SMM) (sold
separately) Any 240 V loads, including central air conditioners, can be
managed using an SMM. The system can accommodate up to eight individual SMMs.
NOTE: SMMs are self-contained and have individual built-in controllers. They
are wired in series with the 240 V branch circuit wiring between the circuit
breaker and the managed load.
000106
Figure 2-3. Smart Management Module (SMM)
PWRcell Automatic Transfer Switch Installation Manual
Application Considerations
NOTE: Use of an SMM for load management of a PWRcell system is limited to
operation with the SMM’s Lock Out Jumper in its default (A) position. For
details on jumper location and adjustment, reference the Smart Management
Module Owner’s / Installation Manual.
An overload condition is determined by the PWRcell Inverter frequency while
the inverter is in Island Mode. Loads are managed and de-energized when
frequency is less than 58 Hz for three seconds or less than 50 Hz for ½ second
(for 60 Hz systems).
The PWRcell ATS controller can be used in conjunction with individual SMMs to
manage a combined total of eight loads.
· The priority order determines the order in which managed loads are re-
energized by the load management system after all of the managed loads have
been de-energized due to a utility service interruption or overload condition.
· Use Priorities A/C 1 4 on the controller as the top priorities, then up to
four SMMs as Priorities 5 8.
· Use only select A/C priorities on the controller as the top priorities, then
use additional SMMs as the remaining priorities.
· A SMM can share a priority with an A/C priority on the controller provided
the standby power source is sized to handle the combined surge load from both
appliances. Sharing priorities can allow up to 12 loads to be managed in a
properly sized system.
In any combination of modules, the recovery times after a loss of utility
power or shutdown due to overload are shown in Table 1: Priority Settings.
Table 1. Priority Settings
Priority 1 2 3 4 5 6 7 8
Recovery Time
5 minutes
5 minutes 15 seconds
5 minutes 30 seconds
5 minutes 45 seconds
6 minutes
6 minutes 15 seconds
6 minutes 30 seconds
6 minutes 45 seconds
PWRcell ATS Controller Yes Yes
Yes
Yes NA NA
NA
NA
SMM Yes Yes Yes Yes Yes Yes Yes Yes
Refer to the SMM Owner’s / Installation Manual for detailed characteristics
and specifications of that product.
7
General Information
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8
PWRcell Automatic Transfer Switch Installation Manual
Section 3: Installation (ESS-Only)
Installation (ESS-Only)
Introduction to Installation
This equipment has been wired and tested at the factory. Installing the switch
includes the following procedures:
1. Open Enclosure
2. Mount the Enclosure
3. Connect Utility and Standby Power Sources
4. Connect the Inverter ATS Control Cable
5. Connect Current Transformers (CTs)
6. Connect Air Conditioner Loads
7. Configure the Inverter
8. Apply Fault Current Label
Inverter Compatibility
The PWRcell ATS is compatible with all single-phase residential models of the
PWRcell Inverter. For installations where a generator will be integrated, use
only XVT076A03 model inverters. To determine the model of your inverter, refer
to the product label on the bottom right hand side of the enclosure. You will
see the model number “X7602” or “XVT076A03”.
Mount the Enclosure
Mounting dimensions for the transfer switch enclosure are in this manual.
Enclosures are typically wallmounted. See Drawings and Diagrams.
DANGER
Equipment malfunction. Installing a dirty or damaged transfer switch will
cause equipment malfunction and will result in death or serious injury.
(000119)
This transfer switch is mounted in a UL type 3R enclosure. It can be mounted
outside or inside and should be based on the layout of installation,
convenience and proximity to the utility supply and load center. Install the
transfer switch as close as possible to the electrical loads that are to be
connected to it. Mount the switch vertically to a rigid supporting structure.
Horizontal mounting of the switch is prohibited. To prevent switch distortion,
level all mounting points. If necessary, use washers behind mounting holes to
level the unit.
D
J A
H
B
GF
E C Figure 3-1. Open Enclosure
004397
Open Enclosure
See Figure 3-1. First, remove outer cover (A): 1. Remove thumb screw (B). 2.
Slide slot (C) over retention tab. 3. Lower cover until clear of top flange
(D), and pull away from enclosure.
4. Remove inner panel (E).
NOTE: Inner panel (E) is ONLY on Service Entrance Rated Models.
5. Loosen nut (F) until it clears t-slot (H) in inner panel.
6. Grasp inner panel at two cutouts (G left and right). Tilt inner panel as
shown, passing nut through t-slot.
7. Lower inner panel until clear of two retention slots (J left and right
sides), and pull away from enclosure.
NOTE: Two 3.15 A fuses, designed for the PWRcell Inverter, are taped to the
front of the PWRcell ATS Controller. These fuses are a necessary component for
integrating an AC coupled generator with the PWRcell system. For details, see
Replace Fuses in PWRcell Inverter for Generator Integration.
PWRcell Automatic Transfer Switch Installation Manual
9
Installation (ESS-Only)
Connect Utility and Standby Power Sources
DANGER
Electrocution. Turn utility and emergency power supplies to OFF before
connecting power source and load lines. Failure to do so will result in death
or serious injury. (000116)
Installation and interconnection drawings are provided in this manual. See
Drawings and Diagrams.
NOTE: All installations must comply with national, state, and local codes. It
is the responsibility of the installer to perform an installation that will
pass the final electrical inspection.
1. Remove the finger safe barrier covers and connect utility supply at the
utility service disconnect circuit breaker terminals N1 and N2. Follow torque
specifications listed on the circuit breaker.
2. See Figure 3-2. Connect utility neutral conductor to the neutral terminal
bar (B). The grounding electrode conductors can be connected to the equipment
grounding terminal bar (C) (see NEC 250.24(A)(4)). Follow all torque
specifications for the terminal bars. A wire type main bonding jumper is
provided to properly bond the service equipment.
NOTE: A wire type main bonding jumper (A) is provided on 200 A units and 100 A
Service Entrance rated units. This bonding jumper can be removed if needed
where the ATS is not installed as service equipment.
NOTE: 100 A service entrance rated model will have a service disconnect in
area (D) of Figure 33.
3. Use a 2-pole 40 A circuit breaker to connect the L1 and L2 terminals on
the inverter’s AC Grid Connection terminals to the main distribution panel.
Follow the torque specifications listed on the circuit breaker.
NOTE: Improper installation of a PWRcell ATS can result in an objectionable
current path through a paralleled neutral connection. Reference NEC 250.6. The
neutral conductor for the inverter AC Grid Connection circuit is not required
to be installed to the point of common coupling with the utility as permitted
by the exception in NEC 200.3. The installer is responsible for compliance
with applicable national, state, and local codes.
4. Connect the inverter protected load ungrounded feeder conductors to
terminals E1 and E2 on the transfer mechanism.
5. Connect the inverter protected load neutral conductor to the neutral
terminal bar. Connect the inverter protected load equipment grounding
10
conductor to the equipment grounding terminal bar. Follow all torque
specifications for the terminal bars. 6. Connect a subpanel supply to T1 and
T2 Terminals. Connect subpanel Neutral conductor to the neutral terminal bar
and the equipment grounding conductor to the equipment ground Copper or
Aluminum conductors shall be sized in accordance with all applicable NEC
requirements, and shall be permitted to be sized based on the 75°C column of
Table 310.16 in the NEC. The installation must comply fully with all
applicable codes, standards, and regulations. Knockouts into the transfer
switch can be made in the field as needed for entry of power cables and
conduit. Conduit entry shall maintain the proper wire bending spaces required
by Tables 312.6 (A) and (B) in the NEC. For transfer switches installed in wet
locations, power cables or conduits entering above the level of uninsulated
live parts shall use fittings listed for use in wet locations as required by
312.2 in the NEC. NOTE: If aluminum conductors are used, apply corrosion
inhibitor to conductors if required by the aluminum conductor manufacturer.
After tightening terminal lugs, carefully wipe away any excess corrosion
inhibitor.
PWRcell Automatic Transfer Switch Installation Manual
Installation (ESS-Only)
N1 N2 C
A B
E1 E2
T1 T2
011167
Figure 3-2. Wiring Connections 200 A Unit
A Bonding Jumper
C
Grounding Terminal Bar
N2 Utility Line 2
E2
Standby Power Source Line 2
T2 Load Line 2
B Neutral Terminal Bar
N1 Utility Line 1
E1
Standby Power Source Line 1
T1 Load Line 1
PWRcell Automatic Transfer Switch Installation Manual
N1 D
N2
E1 E2
C
T2
T1
B A
011266
Figure 3-3. Wiring Connections 100 A Unit
A Bonding Jumper
C
Grounding Terminal Bar
N1 Utility Line 1
E1
Standby Power Source Line 1
T1 Load Line 1
B Neutral Terminal Bar
D Service Disconnect
N2 Utility Line 2
E2
Standby Power Source Line 2
T2 Load Line 2
Tighten terminal lugs to the torque values as noted on the decal located on the inside of the door. After tightening terminal lugs, carefully wipe away any excess corrosion inhibitor.
CAUTION
Equipment damage. Verify all conductors are tightened to the factory specified
torque value. Failure to do so could result in damage to the switch base.
(000120)
Connect the Inverter ATS Control Cable
Use a minimum of a Cat 5 cable to connect the “Inverter ATS control” port on
the controller to the “ATS” port on the Inverter. Use Cat 5 with 600 V
insulation, and route away from the Utility and Inverter supply conductors.
See NEC Article 725.136(D) for more information on the installation
requirements. See Figure 3-4, Figure 3-5, and Figure 3-6.
NOTE: Cat 5 cables are not permitted to be installed in the same raceways as
the power conductors.
11
Installation (ESS-Only)
A
B
C D
E F
G H
U V K L M N
T S
I J
Figure 3-4. Controller Connections
P Q R
O
011242
A Thermostat 1
B Air Conditioner 1
C Thermostat 2
D Air Conditioner 2
E Thermostat 3
F Air Conditioner 3
G Thermostat 4
H Air Conditioner 4
I T1
J N1
K N2
L 0 Ground
M 194 (12V DC)
N 23 (XFSR)
O 240 VAC, 6.3A
Fuses
P Grid Status
Q Inverter CTs
R CTs
S Inverter ATS
Control
T Generator Control
U P1
V P2
12
PWRcell Automatic Transfer Switch Installation Manual
A
FGH
DE
I
J
Installation (ESS-Only)
A D E F GN I J
NO
B
C
M
K
L
009993
Figure 3-5. Inverter Connections for X7602
A
PWRcell DC Disconnects
Service Port H (Generac
personnel only)
REbus BiB directional DC
Terminals
STOP terminals I (external
shutdown)
C Internet Connection
J
Protected Loads Disconnect
D DC Main Fuses
AC Grid K Connection
Terminals
Current E Transformers (CTs)
Accessory Ports
L
Protected Loads Terminals
Automatic Transfer F Switches (ATS)
Accessory Port
M Grounding Bar
G REbus Beacon Port N Not Used
O Not Used
B
C
OP M
K H
L
011201
Figure 3-6. Inverter Connections for XVT076A03
A
PWRcell DC Disconnects
STOP Terminals I (external
shutdown)
REbus BiB directional DC
Terminals
J
Fast-Blow Mini Fuses 1A 250V
AC Grid C Internet Connection K Connection
Terminals
D DC Main Fuses
L
Protected Loads Terminals
Current E Transformers (CTs)
Accessory Ports
M Grounding Bar
Automatic Transfer F Switches (ATS)
Accessory Port
Service Port N (Generac
personnel only)
G REbus Beacon Port O Display
H
RGM PWR / Gen Inhibit
P LTE
PWRcell Automatic Transfer Switch Installation Manual
13
Installation (ESS-Only)
Connect the Current Transformers (CTs)
Connect the CTs as shown in Table 3-1 below. Clamp CT1 and CT2 around the
wires connected to T1 and T2,
respectively.
Table 3-1. CTs Connections
CT Controller PORT
WIRE COLOR
1
CT1+
Yellow
1
CT1-
Green
2
CT2+
Yellow
2
CT2-
Green
Use a Cat 5 cable to connect the “Inverter CTs” port on the controller to the “CTs” port on the Inverter. Use Cat 5 with 600 V insulation, and route away from the Utility and Inverter supply conductors. See Figure 3-4, Figure 3-5, and Figure 3-6.
Connect Air Conditioner Loads
See Figure 3-4. The PWRcell ATS controller can control an air conditioner (24
VAC) directly.
Control of Air Conditioner Load
1. Route the thermostat cable (from the furnace / thermostat to the outdoor
air conditioner unit) to the transfer switch.
2. Connect the wire to the terminal strip terminals (A/C 1) on the PWRcell
ATS Controller as shown in Figure 3-4. These are normally closed contacts
which open upon load shed conditions. Route thermostat wire away from high
voltage wires.
3. If required, connect additional air conditioners to the terminal strip
terminals (A/C 2 4).
Configure the Inverter
To enable control of the PWRcell ATS by a PWRcell
Inverter, inverter settings must be modified. Using the
inverter control panel, review and configure the inverter
settings described below. For more information, see
Adjusting Inverter Settings in the PWRcell Inverter
Installation and Owner’s Manual.
Setting Range Default
Description
NumTran Swtchs
0 / 1 / 2
Defines the number of external automatic transfer switches 0 connected to one inverter system and enables transfer
switch controls.
EnaLoad Shed
0 / 1 / 2
Select 1 if using SMM devices to shed loads. Select 2 if using 0 the PWRcell ATS Controller to shed loads (with or without SMMs).
Apply Fault Current Label
See Figure 3-7. A Fault Current Identification Label is provided in the bag
containing the unit Installation manual and transfer switch manual operation
handle. The 2017 NEC requires that the short-circuit current rating of the
transfer equipment, based on the type of overcurrent protective device
protecting the transfer equipment, be field marked on the exterior of the
transfer equipment. For NEC compliance, verify the required short-circuit
current rating of the transfer switch before installation. The completed label
provides the local AHJ (Authority Having Jurisdiction) with the information he
or she may require during inspection.
Apply the label to the exterior of the transfer switch enclosure. Use a pen to
fill in the required information, and then cover the label with the clear
protective decal.
Contact Ratings
A/C 1 4
24 VAC, 1.0 A Max
NOTE: These instructions are for a typical air conditioner installation. Control of certain heat pumps and 2-stage air conditioners may require special connections or the use of SMMs to control the loads.
Figure 3-7. Fault Current Label
004496
NOTE: The 2020 NEC does not require the use of this label for installations in one and two-family dwelling units.
14
PWRcell Automatic Transfer Switch Installation Manual
Section 4: Operation (ESS-Only)
Operation (ESS-Only)
Functional Tests and Adjustments
Following transfer switch installation and interconnection, inspect the entire
installation carefully. A competent, qualified electrician should perform the
inspection. The installation should comply strictly with all applicable codes,
standards, and regulations. When absolutely certain the installation is proper
and correct, complete a functional test of the system.
CAUTION
Equipment damage. Perform functional tests in the exact order they are
presented in the manual. Failure to do so could result in equipment damage.
(000121)
IMPORTANT: Before proceeding with functional tests, read and make sure all
instructions and information in this section is understood. Also read the
information and instructions of labels and decals affixed to the switch. Note
any options or accessories that might be installed and review their operation.
Manual Operation
DANGER
Electrocution. Do not manually transfer under load. Disconnect transfer switch
from all power sources prior to manual transfer. Failure to do so will result
in death or serious injury, and equipment damage.
(000132)
NOTE: Be sure to remove handle from mechanism upon completion and before
installation of protective covers.
See Figure 4-1. A manual handle (B) is shipped with the transfer switch
manual. Manual operation must be checked BEFORE the transfer switch is
operated electrically. To check manual operation, proceed as follows:
1. Verify the inverter is in the OFF mode. 2. Turn OFF both utility (service
disconnect circuit
breaker) and standby power supplies to the transfer switch.
3. Note position of transfer mechanism main contacts (A) by observing the
movable contact carrier arm. This can be viewed through the long narrow slot
in the inside cover. The top of the movable contact carrier arm is yellow to
be easily identified.
· Manual operation handle in the UP position – LOAD terminals (T1, T2) are
connected to utility terminals (N1, N2).
· Manual operation handle in the DOWN position LOAD terminals (T1, T2) are
connected to STANDBY terminals (E1, E2).
CAUTION
Equipment damage. Do not use excessive force while manually operating the
transfer switch. Doing so could result in equipment damage.
(000122)
Close to Utility Source Side Before proceeding, verify the position of the
switch by observing the position of manual operation handle (A) in Figure 4-1.
If the handle is UP, the contacts are closed in the utility (normal) position,
no further action is required. If the handle is DOWN, proceed with Step 1.
1. With the handle inserted into the movable contact carrier arm, move handle
UP. Be sure to hold on to the handle as it will move quickly after the center
of travel.
2. Remove manual operation handle from movable contact carrier arm. Return
handle to storage bracket.
A
B Figure 4-1. Manual Operation
011169
PWRcell Automatic Transfer Switch Installation Manual
15
Operation (ESS-Only)
Close to Inverter Source Side
Before proceeding, verify the position of the switch by observing the position
of the manual operation handle in Figure 4-1. If the handle is DOWN, the
contacts are closed in the inverter (standby) position. No further action is
required. If the handle is UP, proceed with Step 1.
1. With the handle inserted into the movable contact carrier arm, move the
handle DOWN. Be sure to hold on to the handle as it will move quickly after
the center of travel.
2. Remove manual operation handle from movable contact carrier arm. Return
handle to storage bracket.
Return to Utility Source Side
1. Manually actuate switch to return manual operation handle to the UP
position.
2. Remove manual operation handle from movable contact carrier arm. Return
handle to storage bracket.
NOTE: Be sure to remove handle from mechanism upon completion and before
installation of protective covers.
Voltage Checks
NOTE: Use the Digital Multimeter (DMM) LowZ low input impedance setting to
collect accurate voltage measurements. LowZ eliminates the possibility of
inaccurate ghost voltage readings, also known as phantom voltage or stray
voltage readings. See DMM manufacturer’s literature for additional
information.
Utility Voltage Checks 1. Turn ON the utility power supply to the transfer
switch using the utility service disconnect circuit breaker.
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
2. With an accurate AC voltmeter, check for correct voltage. Measure across
ATS terminal lugs N1 and N2; N1 to NEUTRAL and N2 to NEUTRAL.
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
(000123)
Inverter Voltage Checks
1. Open all breakers in load center. 2. Open service entrance breaker in ATS
or switch
upstream of the ATS. 3. Inverter should switch the ATS and begin powering
the load center.
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
4. Confirm voltage and frequency of each phase in load center using
multimeter. Each phase should be between 118 124 V, and 59.9 60.1 Hz.
5. To end test, close the service entrance circuit breaker.
NOTE: ESS should be charged to at least 20% before performing this test.
PWRcell System Voltage Tests
1. Open all breakers in load center except one dualpole breaker of 20 30 A.
2. Open service entrance breaker in ATS or switch upstream of the ATS.
3. Inverter should switch the ATS and begin powering the load center.
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
4. Check power output from inverter on the LCD interface on the inverter. If
less than 1 kW, close more breakers in load center until load reaches 1 kW.
5. Confirm voltage and frequency of each phase in load center using
multimeter. Each phase should be between 118 124 V, and 59.9 60.1 Hz.
6. To end test, close the service entrance circuit breaker, then the
remaining breakers in the load center.
NOTE: ESS should be charged to at least 20% before performing this test.
16
PWRcell Automatic Transfer Switch Installation Manual
Operation (ESS-Only)
Installation Summary
1. Verify the installation has been properly performed as outlined by the
manufacturer and that it meets all applicable laws and codes.
2. Verify proper operation of the system as outlined in the appropriate
installation and owner’s manuals.
3. Educate the end-user on the proper operation, maintenance, and service
call procedures.
NOTE: The Utility Power Circuit Breaker in the transfer switch must be turned
OFF to simulate a utility outage. Shutting off the main disconnect in a
subpanel connected to the transfer switch will NOT simulate an outage.
PWRcell ATS Controller Fuse Service
See Figure 4-2. A fuse removal and installation tool (A) is included in the
controller housing.
Maintenance
DANGER
Automatic start-up. Disconnect utility power and render unit inoperable before
working on unit. Failure to do so will result in death or serious injury.
(000191)
The PWRCell ATS requires no specific maintenance. Please refer to the
appropriate installation and owner’s manuals for maintenance guidance on other
PWRcell products in the system.
Testing the PWRcell ATS Controller
A “Test” push button is provided on top of the PWRcell ATS Controller to test
the operation of the load shed functions. The test pushbutton will work when
the ATS is in the utility or the inverter position.
1. Turn on the utility supply to the ATS. 2. Wait for 5 minutes. 3. Verify
managed loads are powered and all LEDs
illuminate on controller. 4. Press the TEST button on the controller. 5.
Verify that all of the connected loads to be “shed”
become disabled. 6. After five (5) minutes verify A/C 1 is energized and
Status LED A/C 1 is ON. 7. After another 15 seconds, verify A/C 2 is energized
and Status LED A/C 2 is ON. 8. After another 15 seconds, verify Load A/C 3 is
energized and Status LED Load A/C 3 is ON. 9. After another 15 seconds, verify
A/C 4 is energized
and Status LED A/C 4 is ON.
A
011461
Figure 4-2. Fuse Removal and Installation Tool
If a fuse requires replacement, snap the tool free with an appropriate tool
such as diagonal pliers, and use it to replace the fuse. The tool can be
stored in the controller housing retainer directly above the fuses, with the
large thumb tab facing out.
Use only Generac replacement fuses — part number 10000005117, rated 240 VAC,
6.3 Amps, 10,000 AIC.
Alternative fuses are Littelfuse® 021606.3MXP or Optifuse® FCD-6.3.
Testing the SMM
Refer to the SMM Owner’s / Installation Manual for testing procedure.
PWRcell Automatic Transfer Switch Installation Manual
17
Operation (ESS-Only)
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18
PWRcell Automatic Transfer Switch Installation Manual
Section 5: Generator Integration
Generator Integration
Generator Integration Overview
The PWRcell ATS can integrate a Generac Automatic Home Standby Generator with
a PWRcell ESS to power more simultaneous loads and enable longer backup run
times. Compatible generators are limited to Generacproduced, single-phase
models 10 kW or larger with an air-cooled engine and an EVO I or EVO II
Evolution controller. You can consult an authorized Generac installer to
determine if your generator can be integrated into a PWRcell ESS.
Configuration Options
PWRcell systems that integrate a Generac generator may use one of two
installation configuration options: Flexible Coverage or Whole Home Backup.
Generator size, PWRcell system size, coverage needs, and application should
all be considered when choosing the correct configuration for your site.
NOTE: PWRcell ATS requires a PWRcell ESS to function and cannot be used for
Generator-only applications.
Configuration
Inverter Requirements
ATS Quantity*
Protected Loads Panel
Interconnection Drawing
Flexible Coverage
XVT076A03
1
Yes
A0001501194 pg 3 of 4
Whole Home Backup
XVT076A03
2
No
A0001501194 pg 4 of 4
*ATS model and size should be selected with site requirements in mind. It is the responsibility of the installer to ensure the correct ATS is
selected for the installation site and application.
Replace Fuses in PWRcell Inverter for Generator Integration
See Figure 5-1. When integrating a Generac Home Standby Generator with a
PWRcell system, it is required to replace the 1 A fuses in the PWRcell
Inverter for the RGM PWR / Gen Inhibit circuit with the 3.15 A fuses included
with this ATS.
· Locate and remove the two 3.15 A fuses attached to the front of the PWRcell
ATS Controller.
· Remove both 1 A fuses from the PWRcell Inverter.
· Install the two 3.15 A fuses into the PWRcell Inverter.
3.15A
Failure to
replace fuses
in the inverter
can result in
ATS damage.
013183
Figure 5-1. Replace Fuses for Generator Integration
PWRcell Automatic Transfer Switch Installation Manual
19
Generator Integration
Installation
DANGER
Electrocution. Turn utility and emergency power supplies to OFF before
connecting power source and load lines. Failure to do so will result in death
or serious injury. (000116)
Begin by opening the enclosure of the PWRcell ATS. See Open Enclosure for more
details. For complete installation and interconnection diagrams, see Drawings
and Diagrams in this manual.
NOTE: All installations must comply with national, state, and local codes. It
is the responsibility of the installer to perform an installation that will
pass the final electrical inspection.
Flexible Coverage
The Flexible Coverage configuration offers generatorpowered whole home backup
with optional ESS backup for a protected loads panel. Reference
Interconnection Drawing No. A0001501194 (Part 3 of 4) — INTERCONNECTION XFER
SW 100-200 A — PWRcell Inverter which is found at the end of this manual.
1. Connect utility service conductors at the utility service disconnect
circuit breaker terminals N1 and N2. Follow torque specifications listed on
the circuit breaker.
2. See Figure 3-2. Connect the utility neutral conductor to the neutral
terminal bar. The grounding electrode conductors can be connected to the
equipment grounding terminal bar (see NEC 250.24(A)(4)). Follow all torque
specifications for the terminal bars. A wire main bonding jumper is provided
to properly bond the service equipment.
NOTE: A wire type main bonding jumper (A) is provided on 200 A units and 100 A
Service Entrance rated units. This bonding jumper can be removed if needed
where the ATS is not installed as service equipment.
NOTE: Service entrance rated models will have a service disconnect in area (D)
of Figure 3-3.
3. Connect the E1 and E2 power lugs in the generator to terminals E1 and E2
on the transfer mechanism. Connect the generator neutral wire to the neutral
terminal bar. Connect the generator ground wire to the equipment grounding
terminal bar.
4. Connect the main distribution panel to the PWRcell ATS T1 and T2
terminals. Connect main distribution panel neutral conductor to the neutral
terminal bar and the equipment grounding conductor to the equipment ground
bar.
NOTE: Copper or aluminum conductors shall be sized in accordance with all
applicable NEC requirements and shall be permitted to be sized based on the
75°C column
of Table 310.16 in the NEC. The installation must comply fully with all
applicable codes, standards, and regulations.
5. Use a 2-Pole 40 A circuit breaker to connect the inverter AC Grid
Connection terminals L1 and L2 to the main distribution panel. Follow the
torque specifications listed on the circuit breaker.
6. Connect the inverter AC Grid Connection neutral terminal N1 to the neutral
bar in the main distribution panel. Also connect the inverter ground bar to
the equipment grounding bar in the main distribution panel.
7. Connect the inverter Protected Loads terminals L1 Protcd and L2 Protcd to
the main breaker or main lugs of the protected loads panel.
8. Connect the N2 Protcd terminal on the inverter Protected Loads terminals
to the neutral terminal bar on the protected loads panel. Also connect the
inverter’s ground bar to the equipment grounding terminal bar in the protected
loads panel.
9. Using 26-16 AWG wire, connect the inverter Gen Inhibit L1 and L2 terminals
to the PWRcell ATS Controller P1 and P2 terminals, respectively.
10. Reference Connect the Inverter ATS Control Cable, Connect the Current
Transformers (CTs), and Connect Air Conditioner Loads to complete ATS wiring
requirements.
Whole Home Backup
The Whole Home Backup configuration with AC generator integration offers both
generator and ESS backup power for the whole home by using two transfer
switches – one to transfer power between utility and a generator, and one to
unlock whole home backup from the PWRcell Inverter ATS. Reference
Interconnection Drawing No. A0001501194 (Part 4 of 4) — INTERCONNECTION XFER
SW 100-200 A — PWRcell Inverter which is found at the end of this manual.
NOTE: The inverter ATS is not required to be a service rated ATS in this
configuration.
1. Connect utility service conductors at the utility service disconnect
circuit breaker terminals N1 and N2 of the generator ATS. Follow torque
specifications listed on the circuit breaker.
2. Connect the utility neutral conductor to the neutral terminal bar of the
generator ATS. The grounding electrode conductors can be connected to the
equipment grounding terminal bar (see NEC 250.24(a)(4)). Follow all torque
specifications for the terminal bars. A wire main bonding jumper is provided
to properly bond the service equipment.
3. Connect the E1 and E2 power lugs in the generator to terminals E1 and E2
on the transfer mechanism in the generator ATS. Connect the generator
20
PWRcell Automatic Transfer Switch Installation Manual
Generator Integration
neutral wire to the neutral terminal bar on the generator ATS. Connect the
generator ground wire to the equipment grounding terminal bar on the generator
ATS.
4. Connect the T1 and T2 terminals on the generator ATS to terminals N1 and
N2 on the inverter ATS.
5. Connect the neutral terminal bar on the generator ATS to the neutral
terminal bar on the inverter ATS. Connect the equipment grounding bar on the
generator ATS to the equipment grounding bar on the inverter ATS.
6. Connect the T1 and T2 terminals on the inverter ATS to the main
distribution panel supply. Connect the main panel neutral conductor to the
neutral terminal bar and the equipment grounding conductor to the equipment
ground bar on the inverter ATS.
7. Use a 2-Pole 40 A circuit breaker to connect the inverter AC Grid
Connection terminals L1 and L2 to the main distribution panel.
8. Connect the inverter’s ground bar to the equipment grounding bar in the
main distribution panel.
NOTE: Improper installation of a PWRcell ATS can result in an objectionable
current path through a paralleled neutral connection. Reference NEC 250.6. The
neutral conductor for the inverter AC Grid Connection circuit is not required
to be installed to the point of common coupling with the utility as permitted
by the exception in NEC 200.3. The installer is responsible for compliance
with applicable national, state, and local codes.
9. Connect the N2 Protcd terminal of the inverter Protected Loads terminals
to the neutral terminal bar in the inverter ATS.
10. Connect the inverter Protected Loads terminals L1 Protcd and L2 Protcd to
terminals E1 and E2 on the transfer mechanism of the inverter ATS.
11. Using 26-16 AWG wire, connect the “Generator Control” terminals on the
inverter’s PWRcell ATS Controller to the matching “Generator Control”
terminals on the generator’s PWRcell ATS Controller, taking care to maintain
polarity.
12. Using 26-16 AWG wire, connect the Gen Inhibit L1 and L2 terminals in the
inverter wiring compartment to the P1 and P2 terminals, respectively, on the
generator’s PWRcell ATS Controller.
13. Reference Connect the Inverter ATS Control Cable to connect the “ATS”
port on the inverter to the inverter ATS. Reference Connect Air Conditioner
Loads to complete wiring requirements for the inverter ATS.
14. Reference Connect the Current Transformers (CTs) to complete ATS wiring
requirements for the generator ATS.
15. Reference Load Management Options to ensure inverter has sufficient protection from overload.
Setup and Commissioning
Perform the following procedures to setup and commission the system:
1. Verify Wiring (Wiring Checklist).
2. Activate the Generac Home Standby Generator.
3. Validate Powering the Home with the Generator Only.
4. Commission the PWRcell System.
5. Validate Inverter and Battery Firmware Versions.
6. Configure Inverter Settings for Generator Integration.
7. Reference Generator Commands.
Manual
Override
8. Validate Charging the ESS from the Generator.
9. Validate Powering the Home with the ESS Only.
10. Set Auto Control.
11. Validate Return to Grid Connected Operation.
Wiring Checklist
Before proceeding to the Generator Integration functionality test procedures,
please first validate that the PWRcell system with the Generac Automatic Home
Standby Generator is correctly wired using the following checklist.
THIS CHECKLIST MUST BE COMPLETED BEFORE ENERGIZING THE SYSTEM.
CTs ATS
H
I
J
K
L
Figure 5-2. Accessory Ports
010001
H Current Transformers (CTs) Accessory Port (RJ-45) I Automatic Transfer
Switch (ATS) Accessory Port
(RJ-45)
J REbus Beacon Port (USB-B) K Authorized Generac Personnel Only L STOP
Terminals
For Flexible Coverage:
The Inverter ATS Control port on the PWRcell ATS
controller is wired to the inverter “ATS” port via Cat 5 cable. The inverter
“ATS” port is labeled ‘I’ in Figure 5-2.
The “Inverter CTs” port on the PWRcell ATS controller
PWRcell Automatic Transfer Switch Installation Manual
21
Generator Integration
is wired to the inverter “CTs” port via Cat 5 cable. The inverter “CTs” port
is labeled ‘H’ in Figure 5-2.
The “Gen Inhibit” L1 and L2 terminals in the inverter
wiring compartment are wired to the P1 and P2 terminals, respectively, on the
PWRcell ATS Controller See item “H” in Figure 3-6.
The utility is wired to the N terminals on the PWRcell
ATS.
The generator is wired to the E terminals on the
PWRcell ATS.
The main distribution panel is wired to the T terminals
in the PWRcell ATS.
The protected loads subpanel is wired to the
Protected Loads terminals of the inverter.
For Whole Home:
The “Inverter ATS Control” port on the inverter
PWRcell ATS controller is wired to the inverter “ATS” port via Cat 5 cable.
The inverter “ATS” port is labeled ‘I’ in Figure 5-2.
The “Inverter CTs” port on the generator PWRcell ATS
controller is wired to the inverter “CTs” port via Cat 5 cable. The inverter
“CTs” port is labeled `H’ in Figure 5-2.
The “Generator Control” terminals on the inverter ATS
are connected to the “Generator Control” terminals on the generator ATS.
The “Gen Inhibit” L1 and L2 terminals in the inverter
wiring compartment are wired to the P1 and P2 terminals, respectively, on the
generator PWRcell ATS Controller. See item H in Figure 3-6.
The service conductors are wired to the N terminals
on the generator PWRcell ATS.
The generator is wired to the E terminals on the
generator PWRcell ATS.
The T terminals of the generator PWRcell ATS are
wired to the N terminals of the inverter PWRcell ATS.
The inverter’s Protected Loads terminals are wired to
the E terminals of the inverter PWRcell ATS.
The T terminals of the inverter PWRcell ATS are wired
to the main distribution panel.
The main distribution panel is wired to the AC Grid
Connection terminals on the inverter through a 2-Pole 40 A breaker.
Check consistency of L1 and L2, ensuring lines do not
cross over or change between the inverter ATS, the inverter, and the main
distribution panel (the system must be powered off for these steps).
Ensure the inverter ATS is in the UP position.
Use the manual operation handle as needed.
Verify utility power is still disconnected from
entire installation and close the 2-pole 40 A backfeed breaker for the
inverter AC Grid Connection. Also verify the Protected Loads Disconnect is
closed.
With a digital multi-meter, measure continuity
between the T1 and E1 terminals on the inverter ATS. If there is no
continuity, check for miswiring and ensure consistency of L1 and L2 across
equipment.
Open the 2-pole 40 A backfeed breaker for the
inverter AC Grid Connection.
Activate the Generac Home Standby Generator
Activate the Generac Home Standby Generator prior to commissioning the PWRcell
system. Follow the activation instructions in the generator manual
accompanying the unit.
Validate Powering the Home with the Generator Only
1. Ensure the generator is in “AUTO” mode by checking the control panel on
the generator and ensure the generator has enough fuel for a short test.
2. Verify the PWRcell system is not powered and the 40 A solar backfeed
breaker for the inverter is open in the OFF position.
3. Disconnect the home from utility power. Be sure to disconnect power
upstream from the PWRcell ATS connected to the generator. If the PWRcell ATS
is service entrance rated, the main breaker inside the PWRcell ATS can be used
to disconnect utility power.
4. Verify that the generator starts and powers the main panel.
5. Reconnect to utility power and ensure the generator turns off after a few
minutes. The ATS should return to the normal utility position.
Commission the PWRcell System
With the generator off, complete PWRcell system wiring and follow
commissioning instructions. See Section 5: Electrical Connections for system
wiring in the inverter Installation and Owner’s Manual. See Section 6:
Commissioning in the inverter Installation and Owner’s Manual for pre-
commissioning checks and system commissioning.
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PWRcell Automatic Transfer Switch Installation Manual
Generator Integration
Validate Inverter and Battery Firmware Versions
1. Access the Installer Configuration Tool by logging onto the REbus Beacon.
2. Select Inverter’ from the menu. 3. Select ‘Common’ from the inverter submenu. 4. Verify that the inverter firmware version is 13760 or greater. 5. SelectBattery’ from the menu. 6. Select ‘Common’ from the battery submenu.
7. Verify that the battery firmware version is 12970 or greater.
NOTE: See Verifying Inverter Firmware Version section in PWRcell Inverter
Installation and Owner’s Manual for more information. To request a firmware
update, please call 1-855-395-7841 or
visit generac.com/resources-andtools/ce-installer-resources/installation-
resources.
Configure Inverter Settings for Generator Integration
1. From the home screen on the inverter control panel, use the right arrow
key to navigate to the inverter device page.
2. Push the center button to access the inverter device main menu. 3.
Navigate to “Mod. Settings” using the down arrow key and select using the
center button. Modify the settings in
the following table based on site configuration:
Setting NumTranSwtchs EnaLoadShed
GenPower
GenCtrlMode
Range 0 / 1 / 2 0 / 1 / 2 0 24 kW
0 / 1 / 2
Default 0
0 0
Description Defines the number of external automatic transfer switches
connected to one inverter system and enables transfer switch controls.
For generator integration, this must be 1 for Flexible Coverage configuration
and 2 for Whole Home Backup configuration. Select 1 if using SMM devices to
shed loads. Select 2 if using the PWRcell ATS Controller to shed loads (with
or without SMMs). Nameplate power rating of the integrated Generac Home
Standby Generator. If no generator is integrated, leave at 0. To set Generator
Control Mode select one of the three settings below. See Generator Control
Modes for more info.
0
0 = Single Transfer
1 = Source Cycling
2 = Always On
4. Use the down arrow key to scroll to the bottom of the menu and select `Save’ using the center button to save settings changes.
PWRcell Automatic Transfer Switch Installation Manual
23
Generator Integration
Generator Control Modes
Generators integrated into a PWRcell ESS can operate using one of three
control modes -Single Transfer’,Source Cycling’, or `Always On’- depending
on the installation configuration and the home owner’s usage needs.
Generator Control Mode Single Transfer Source Cycling Always On
Description
In the event of a power outage, the inverter will prioritize using the ESS to
power the home, and the generator will be kept off. Once the ESS SoC goes
below 25%, the inverter will switch the home to generator power. Spare
generator power will be used to charge the ESS. The home will be powered by
the generator for the remainder of the outage.
In the event of a power outage, the inverter will prioritize using the ESS to
power the home, and the generator will be kept off. Once the ESS SoC goes
below 25%, the inverter will switch the home to generator power. Spare
generator power will be used to charge the ESS. Once the ESS SoC goes above
95%, the inverter will switch the home back to ESS power, and this cycling
between ESS and generator power will repeat for the remainder of the outage.
In the event of a power outage, inverter will prioritize using the generator
to power the home. Spare generator power will be used to charge the ESS. The
home will be powered by the generator for the remainder of the outage.
NOTE: In an outage, the inverter will prioritize solar power over generator power to charge the batteries but can use excess generator power if needed and when available.
NOTE: If the inverter system is unable to supply adequate power to the active loads, the system will switch backup supply to the integrated generator regardless of the selected operating mode.
Generator Manual Override Commands
For PWRcell systems properly configured and set for AC Generator Integration,
there are manual override commands that can be accessed using the inverter
control panel. Use these commands to temporarily override the generator
control mode selected. Select `Auto Gen Ctrl’ to return to using the selected
generator control mode.
Generator Manual Override Command
Description
Auto Gen Ctrl
Returns the system to operate using its Generator Control Mode after an
override command.
NOTE: Selecting `Auto Gen Ctrl’ does not modify the Generator Control Mode.
Turn Gen On
Sends a command to have the system turn on the integrated Generac Home Standby Generator. Use this to override Generator Control Modes, ‘Single Transfer’ or ‘Source Cycling.’ This will allow the ESS to charge from the generator.
Turn Gen Off
Sends a command to have the system turn off the integrated Generac Home
Standby Generator. Use this to override the operation of the generator and
allow the PWRcell system to support house loads.
NOTE: Upon selection, the generator may come back on if the battery cannot
support house loads.
NOTE: Upon restoration of grid power, the manual override command will be cleared, and the inverter will transition back to using the Generator Control Mode.
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PWRcell Automatic Transfer Switch Installation Manual
Generator Integration
Validate Charging the ESS from the Generator
1. Ensure all PWRcell system components (inverter, PV Links, and batteries)
are enabled.
2. Ensure ‘GenCtrlMode’ is set to either ‘0’ for ‘Single Transfer’ or ‘1’ for
‘Source Cycling.’ Do not select ‘2’ for ‘Always On’ for this test.
3. Disconnect the entire system from utility power. The ESS will begin
powering house loads (protected loads or whole home depending on installation
configuration).
4. At the inverter device page, press the center button to access the
inverter device menu.
5. At the inverter device menu, use the down arrow key to scroll down to the
“Turn Gen On” option and press the center button to select. This will
temporarily override the Generator Control Mode to ensure the home is powered
by the generator power only.
6. Navigate to the home screen on the inverter control panel and verify the
generator icon is shown in the bottom right corner.
7. Verify the ESS is charging from generator power as shown by the power flow
display on the home screen.
NOTE: Large house loads may limit or cause fluctuations in battery charging.
Validate Powering the Home with the ESS Only
1. Complete the procedure above to Validate Charging the ESS from the
Generator.
2. Confirm the ESS is charged up to 40% or higher. If not, continue charging
the ESS from the generator.
3. Navigate to the inverter device page on the inverter control panel.
4. Press the center button to access the inverter device menu.
5. Use the down arrow key to scroll to the “Turn Gen Off” option and press
the center button to select. This will switch the home to ESS power instead of
generator power during a utility service interruption as long as the ESS has
sufficient charge.
6. Verify the inverter immediately takes over powering house loads. The
generator should turn off completely within a few minutes.
7. Navigate to the home screen on the inverter control panel and verify that
the generator icon is no longer shown in the bottom right corner.
8. Verify the ESS is powering the home. Depending on your configuration
(Flexible Coverage or Whole Home Backup), either the protected loads or the
whole home will be powered.
Set Auto Control
1. Verify that ‘GenCtrlMode’ is set for the preferred Generator Control Mode.
2. Navigate to the inverter device page on the inverter control panel.
3. Press the center button to access the device menu. 4. Use the down arrow
key to scroll down to the “Auto
Gen Ctrl” option and press the center button to select. This will return the
system to automatic control of switching between ESS and generator power
during a utility service interruption, depending on the selected Generator
Control Mode.
Validate Return to Grid Connected Operation
1. Reconnect utility power. 2. Verify the home is powered by the utility
within 30
seconds.
3. Verify the inverter connects to the grid within 5 minutes. The inverter
will show “grid connected” on the inverter device page.
NOTE: Upon restoration of grid power, the manual override setting will be
cleared, and the inverter will transition back to using the Generator Control
Mode.
PWRcell Automatic Transfer Switch Installation Manual
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Generator Integration
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PWRcell Automatic Transfer Switch Installation Manual
Section 6: Troubleshooting
Troubleshooting
Troubleshooting
Problem
On the inverter device page, “fuse blown” error
shown.
Generator is still running after using the “Turn Gen
Off” command.
Home is unpowered while the generator is running.
Switched to generator power when the ESS SoC
is above 25%. (Doesn’t apply to “Always On” mode)
Possible Cause
The ATS Cat 5 cable is faulty.
The P1/P2 connections on PWRcell ATS Controller are miswired.
If using two ATSs, “Generator Control” is miswired.
Fast-Blow Mini Fuses are blown. See Figure 3-6.
Loads exceeds what the ESS can supply.
ESS is below 25% SoC.
The ESS experienced an overload while islanded and it can’t connect the loads
to the generator since they exceed the safe operating limits of
the ESS. Lost communication with the
PWRcell Battery.
Loads exceed what the ESS can supply.
Solution Ensure male RJ45 connectors are properly terminated.
Use a data tester / Cat 5 tester to test continuity.
Check that wiring matches diagrams.
Check that wiring matches diagrams, and make sure that the “Generator Control”
wires do not flip polarity when wiring from one ATS to the other.
Take fuses out, and check them for continuity. Replace fuses that read as open
/ no continuity. For more details,
see the PWRcell Parts Manual.
Reduce load to a level that the ESS can supply.
Allow the generator to charge the ESS before trying to turn the generator off.
Reduce load and then manually turn the generator off using the “OFF” button on
the generator’s control panel. Wait 5 seconds and then turn the generator on
using the
“AUTO” button. The inverter will reconnect the loads during this 5 second
period.
Check that the ground connections are robust since these are used for
communication.
Reduce loads such that they don’t exceed what the ESS can supply.
PWRcell Automatic Transfer Switch Installation Manual
27
Troubleshooting
Error Codes
The inverter can detect a variety of setpoint misconfigurations and wiring
errors. If detected, the inverter will display a unique code on its device
page. A misconfiguration error will show up as “Configuration Error: X”, where
X is the unique code. The table below explains the meaning of the different
codes.
Code 3 4
5
6
7 8 9 A B
Configuration Error Codes Description
Generator integration is not supported on this inverter hardware version.
Newer hardware is needed. Need Islanding enabled for generator integration.
Set “EnaIslanding” setting to “on”. Need to be configured for an ATS for
generator integration. Set “NumTranSwtchs” to 1 when using one ATS and set it
to 2 when using two ATS’s. Configured for using two ATS’s, but not configured
for generator integration. Make sure “GenPower” setting is nonzero and
“NumTranSwtchs” setting reflects the correct number of ATS’s on the system.
Generator integration is not supported on this PWRcell ATS hardware version.
Newer hardware is needed. Make sure “GenPower” setting is between 10 kW and 24
kW for generator integration. Configured for both generator integration and AC
coupled PV, only one of these features can be supported at a time. Generator
integration is only supported for split-phase inverters. Need Islanding
enabled when using an ATS. Set “EnaIslanding” setting to “on”.
A misconfiguration error will show up as “Wiring Error: X”, where X is the unique code. The table below explains the meaning of the different codes.
Code 0 1 2 4
6
7
Wiring Error Codes
Description
Enabled for generator integration but no ATS has been detected. Check to make
sure the “CTs” cable is connected and the ATS Limit switch is connected to the
“Auxiliary Contact” port of the PWRcell ATS.
Not enabled for using an ATS, but an ATS is detected. Make sure the
“NumTranSwtchs” setting reflects the correct number of ATS’s on the system.
The line 1 and line 2 wires are swapped somewhere between the T terminals of
the PWRcell ATS and the Protected Loads terminals of the inverter. Check that
phases do not cross over or change along this path.
The line 1 and 2 wires are swapped somewhere between the E terminals of the
PWRcell ATS and the Protected Loads terminals of the inverter. Check that
phases do not cross over or change along this path.
The inverter ATS did not transfer back to the utility (UP position for ATS
manual operation arm). Verify wiring to the N terminals of the inverter ATS is
correct. Verify the Cat 5 cable for “Inverter ATS Control” is terminated
properly at the inverter and the inverter ATS. Verify that the factory wiring
at the transfer mechanism closing coils and relays are securely fastened at
the transfer mechanism.
The inverter ATS did not transfer to the inverter for backup (DOWN position
for ATS manual operation arm). Verify wiring to the E terminals of the
inverter ATS is correct. Verify the Cat 5 cable for “Inverter ATS Control” is
terminated properly at the inverter and the inverter ATS. Verify that the
factory wiring at the transfer mechanism closing coils and relays are securely
landed in place at the transfer mechanism.
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PWRcell Automatic Transfer Switch Installation Manual
Section 7: Drawings and Diagrams
Installation Drawings
No. 0G6832-A: 100 A SE & non-SE / 150-200 A non-SE
Drawings and Diagrams
PWRcell Automatic Transfer Switch Installation Manual
29
Drawings and Diagrams No.10000012171-A: 150 / 200 A SE
Interconnection Drawings
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PWRcell Automatic Transfer Switch Installation Manual
Drawings and Diagrams No. A0001501194 (Part 1 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell Inverter
WIRING DIAGRAM
INTERCONNECTION PWRCELL XFER SW 100-200A
DRAWING #: A0001501194
GROUP G
Page 1 of 4
16.8552
REVISION: B DATE: 12/8/21
PWRcell Automatic Transfer Switch Installation Manual
31
Drawings and Diagrams No. A0001501194 (Part 2 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell Inverter
WIRING DIAGRAM
INTERCONNECTION PWRCELL XFER SW 100-200A
DRAWING #: A0001501194
GROUP G
Page 2 of 4
16.8552
REVISION: B DATE: 12/8/21
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PWRcell Automatic Transfer Switch Installation Manual
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PWRcell Automatic Transfer Switch Installation Manual
16.8552
REVISION: B DATE: 12/8/21
GROUP G
P1
P2
T1
N1
N2
0
194
23
P1
P2
T1
N1
N2
0
194
23
Page 3 of 4
WIRING DIAGRAM
INTERCONNECTION PWRCELL XFER SW 100-200A
DRAWING #: A0001501194
Drawings and Diagrams No. A0001501194 (Part 3 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell Inverter
PWRcell Automatic Transfer Switch Installation Manual
34
16.8552
REVISION: B DATE: 12/8/21
GC1 GC2
GC1 GC2
GROUP G
GC1 GC2
P1
GC1 GC2
P2
T1
N1
N2
0
194
P1
23
P2
T1
N1
N2
0
194
23
Page 4 of 4
WIRING DIAGRAM
INTERCONNECTION PWRCELL XFER SW 100-200A
DRAWING #: A0001501194
Drawings and Diagrams No. A0001501194 (Part 4 of 4) — INTERCONNECTION XFER SW 100-200 A — PWRcell Inverter
Part No. A0001501191 Rev. A 12/17/2021
©2021 Generac Power Systems, Inc. All rights reserved. Specifications are
subject to change without notice. No reproduction allowed in any form without
prior written consent from Generac Power Systems, Inc.
®
Generac Power Systems, Inc. S45 W29290 Hwy. 59 Waukesha, WI 53189
1-888-GENERAC (1-888-436-3722)
www.generac.com
References
- Generac - A Total Energy Company
- Generac - A Total Energy Company
- Honeywell Generators - Home
- Honeywell Generators - Service and Support | Owner Support | Honeywell Generators
- P65Warnings.ca.gov
- Product Registration & Activation
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