GENERAC RXG10EZA1 Auto Transfer Switch Owner’s Manual
- August 27, 2024
- Generac
Table of Contents
GENERAC RXG10EZA1 Auto Transfer Switch
Specifications
- Model: 50 Amp RXG10EZA1
- Website: www.generac.com
- Contact: 1-888-GENERAC (1-888-436-3722)
Section 1: Introduction and Safety
Thank you for purchasing a Generac Power Systems Inc. product. This unit has been designed to provide high performance, efficient operation, and years of use when maintained properly. Read the manual thoroughly and understand all instructions, cautions, and warnings before using the equipment. If any section is unclear, contact your nearest authorized dealer or Generac Customer Service.
The owner is responsible for proper maintenance and safe use of the equipment. Before operating or servicing the transfer switch:
- Inspect the product carefully.
- Read and understand all safety warnings and instructions before use.
- Follow the instructions on final assembly procedures completely.
- Save the instructions for future reference and supply them to any user of the equipment.
Section 2: General Information
This section provides general information about the product, including installation diagrams and functional tests.
Section 3: Installation
Refer to the installation section for detailed instructions on how to install the automatic transfer switch correctly.
Section 4: Operation
Learn about functional tests, adjustments, and manual operation procedures in this section to ensure proper operation of the transfer switch.
FAQs
Q: Where can I find more information about safety precautions?
A: For more information on safety precautions and warnings, refer to
www.P65Warnings.ca.gov or contact Generac
Customer Service at 1-888-GENERAC
(1-888-436-3722).
Safety Rules
The manufacturer cannot anticipate every possible circumstance that might
involve a hazard. The warnings in this manual, and on tags and decals affixed
to the unit are, therefore, 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. Also make sure the procedure,
work method or operating technique utilized does not render the equipment
unsafe.
Throughout this publication, and on tags and decals affixed to the transfer
switch, 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. Their definitions
are as follows:
50A Automatic Transfer Switch Owner’s Manual
1
Introduction and Safety
Safety Symbols and Meanings
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
DANGER
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
(000119)
DANGER
Electrocution. Water contact with a power source, if not avoided, will result
in death or serious injury.
(000104)
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)
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)
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)
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)
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50A Automatic Transfer Switch Owner’s 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)
Introduction and 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)
WARNING
Sudden start-up. Always set the safety disconnect switch to MANUAL before
working on equipment. Failure to do so could result in death or serious
injury.
(000194)
· 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;
C22.1 Canadian Electric Code, 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.
50A Automatic Transfer Switch Owner’s Manual
3
Introduction and Safety
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50A Automatic Transfer Switch Owner’s Manual
Section 2: General Information
General Information
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.
Equipment Description
This automatic transfer switch is used for transferring critical electrical
load from a utility (normal) power source to a generator (standby) power
source. Such a transfer of electrical loads occurs automatically when the
utility power source has failed or is substantially reduced and the generator
source voltage and frequency have reached an acceptable level. The transfer
switch prevents electrical feedback between two different power sources (such
as the utility and generator sources) and, for that reason, codes require it
in all standby electric system installations.
The transfer switch consists of a transfer mechanism, a control relay, a
terminal strip and fuse holder for connection of sensing wires.
This switch is suitable for control of motors, electric discharge lamps,
tungsten filament and electric heating equipment and the tungsten load does
not exceed 30% of the switch rating.
This UL listed transfer switch is for use in optional standby systems only
(NEC article 702).
A 50A 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
50A maximum circuit breaker (Square D HOM, General Electric HQL, or Eaton
Cutler Hammer BR).
Transfer Switch Features
· UL listed to U.S.A. and Canadian safety standards · Single panels are
compatible with single-phase
generators rated up to 50 Amps/12 kW
· Flush or Surface Mount NEMA 1 enclosure
This switch is listed for use with the following one inch breakers:
· Siemens / Murray type QP
· Eaton type BR
· Square D type HOM
*Including GFCI, AFCI and tandem breakers up to 50 amps.
Specifications
Enclosure
Transfer Switch Transfer Switch Wire Size Ground Lug Neutral Bar Withstand
Rating Main Bus (Amps) Meets NEC Wire Bending Space UL/CUL Listed Weight:
Without Whips With Whips Operating Temperature
NEMA Type 1, Surface or Flush Mount, general purpose, painted
metal, for interior use only Generator Lugs (E1, E2)
Load Lugs (T1, T2)
1220 #414 AWG
10,000
Yes
Yes
20 lbs (9.1 kg) 39 (17.7 kg) 20°F to 140°F (-29°C to 60°C)
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.
000956
Figure 2-1. Panelboard With Operator
50A Automatic Transfer Switch Owner’s Manual
5
General Information
Transfer Switch Enclosure
The standard switch enclosure is a National Electrical Manufacturer’s
Association (NEMA) UL Type 1.
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 Introduction
and Safety carefully. Comply strictly with all information presented in
Introduction and Safety to prevent accidents and/or damage to the equipment.
The manufacturer recommends that a copy of Introduction and Safety 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 · NFPA 70E: Standard for Electrical Safety
in the
Workplace
· UL 1008: Standard for Safety–Automatic Transfer
Switches
· UL 67: Standard for Safety–Panelboard
NOTE: It is essential to use the latest version of any standard to verify
correct and current information.
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50A Automatic Transfer Switch Owner’s Manual
Section 3: Installation
Installation
Introduction
This equipment has been wired and tested at the factory. Installing the switch
includes the following procedures:
· Mounting the enclosure. · Connecting power source and load leads. ·
Connecting the generator start and sensing circuit. · Manually operating
switch to set operator toggle. · Testing functions.
Verify factory torque of conductors as well as electrical harness connections.
Mounting
Mounting dimensions for the NEMA Type 1 Transfer Switch enclosure are in this
manual. Enclosures are typically wall-mounted. See Drawings and Diagrams.
Protect the switch against impact at all times, and against construction grit
and metal chips.
1. Locate automatic transfer switch with built-in emergency load center in
close proximity to the main distribution panel. The transfer switch can be
located to the left or right of the main distribution panel. One (1) foot (0.3
m) is the suggested distance.
NOTE: The transfer switch may be located a different distance from the main
panel depending on available mounting area. Using the two (2) foot (0.61 m)
conduit connected straight across to the main panel is another option. Always
adhere to local electrical codes during installation.
2. Hold transfer switch against the mounting surface. Level the transfer
switch and mark the mounting holes.
3. Drill the appropriate size pilot holes. 4. Mount transfer switch with
built-in load center to
mounting surface with appropriate fasteners.
NOTE: See Figure 3-1. Transfer switch MUST be mounted vertically as shown.
004175
Figure 3-1. Mount Transfer Switch 5. Switch service main circuit breaker to
OFF (OPEN)
before removing cover or any wiring in the main electrical distribution panel.
The wires connected to the service main circuit breaker remain LIVE or HOT.
Avoid contact with these wires and the service main circuit breaker connection
lugs.
NOTE: This switch may be equipped with 2 foot (0.67 m) or 30 foot (9.1 m)
whips. If not provided, size conductors and conduits according to NEC codes.
Connecting Power Source and Load Lines
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
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)
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)
Installation and interconnection diagrams are provided 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.
50A Automatic Transfer Switch Owner’s Manual
7
Installation
2-Pole Mechanism
See Figure 3-2. These switches are used with a singlephase system when the
single-phase NEUTRAL line is to be connected to a Neutral Lug and is not to be
switched.
A
B
C
001488
Figure 3-2. Typical 2-Pole Transfer Mechanism
A.
Utility Lugs (N1 & N2)
B.
Generator Lugs (E1 & E2)
C.
Load Lugs (T1 & T2)
Solderless, screw-type terminal lugs are standard.
Switch Rating 50A
Wire Range 1/014 AWG
Conductor Tightening Torque
50 in.lbs. (5.65 Nm)
Conductor sizes must be adequate to handle the maximum current to which they
will be subjected, based on the 167° F (75°C) column of tables, charts, etc.
used to size conductors. The installation must comply fully with all
applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove any surface oxides from
the cable ends with a wire brush. All power cables should enter the switch
next to transfer mechanism terminals.
NOTE: If aluminum conductors are used, apply corrosion inhibitor to
conductors. After tightening terminal lugs, carefully wipe away any excess
corrosion inhibitor.
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 power source and load conductors to clearly marked terminal lugs on
transfer mechanism as follows:
1. Connect utility (normal) power source cables to utility service disconnect
circuit breaker.
2. Connect the generator (standby) source power cables to transfer switch
terminals E1 and E2. Connect customer LOAD leads to switch terminals T1 and
T2.
Conductors must be properly supported, of approved insulative qualities,
protected by approved conduit, and of the correct wire gauge size in
accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal parts and
grounded metal. Allow at least onehalf inch (13 mm) for 100-400 amp circuits.
Connecting Start Circuit Wires
Control system interconnections (Electrical Data section) consist of UTILITY 1
(N1), UTILITY 2 (N2) and LOAD (T1), and leads 23 and 194. Recommended wire
gauge sizes for this wiring depends on the length of the wire, as recommended
in the following chart:
Maximum Wire Length Recommended Wire Size
1115 ft (0.335 m) 116185 ft (3656 m)
No. 18 AWG No. 16 AWG
186295 ft (5789 m) 296460 ft (90140 m)
No. 14 AWG No. 12 AWG
Exception: Conductors of AC and DC circuits, rated 1000 volts nominal or less, shall be permitted to occupy the same equipment, cable, or conduit. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the equipment, cable, or conduit. See NEC 300.3(C)(1).
8
50A Automatic Transfer Switch Owner’s Manual
Installation
Circuit Breaker Wiring
NOTE: Balance must be maintained when moving circuit locations from main
electrical distribution panel to emergency load center. Circuit breaker
positions alternate buss bars vertically. Circuits sharing a neutral wire
should either be moved together to adjacent positions in emergency load center
or not moved. If unsure of the proper procedure or if the installation differs
from that described in this guide, consult a licensed professional at this
time.
1. Remove the main electrical distribution panel cover.
2. Remove appropriate size knockout from the right side of the main panel.
(If provided, a two foot (0.67 m) flexible conduit is pre-wired from the
transfer switch with built-in load center).
3. Remove threaded lock nut from conduit coupling. Feed all wires through
knockout into main panel. Slip lock nut over wires and tighten securely onto
conduit coupling.
NOTE: Circuits to be moved must be protected by same size breaker. For
example, a 15 amp 120 volt circuit in emergency load center will replace a 15
amp 120 volt circuit in main electrical distribution panel.
4. In the main panel, remove the black (hot) wire from the circuit breaker
that protects a circuit to be powered in the event of a power failure. Wire
nut the black wire to the matching circuit lead wire from the emergency
circuit breaker in the load center in the transfer switch. (All circuit wires
are color coded and labeled for easy identification). UL listed wire locknuts
are included in installation kit.
5. Trace each black (hot) wire connected and wire nut the white (neutral)
wire from the same Romex cable (circuit) to the matching circuit number on the
white (neutral) wire from the emergency load center. Repeat for each circuit.
6. Repeat this process with the remaining circuits to be powered by the
generator.
NOTE: Both grounded and ungrounded conductors must be moved to the emergency
panel and connected to the new wiring from the emergency panel using supplied
wire nuts.
7. Install the 50 amp double pole breaker into main electrical distribution
panel. This circuit breaker must be compatible with the main electrical
distribution panel. It may be necessary to reposition remaining circuit
breakers or remove circuit breakers that have been disconnected to accommodate
the insertion of the 50 amp double pole circuit breaker.
8. Connect white wire to the main distribution panel neutral bar.
9. Connect solid green wire to main electrical panel ground bar.
10. Connect the black and red wires to the 50 amp double pole circuit
breaker.
11. Reinstall the main distribution panel cover.
NOTE: In some applications, installers wish to substitute double-pole circuit
breakers for single-pole circuit breakers. In order to accommodate the
additional neutral wires, a dual neutral/ground kit can be installed on
prewired switches. The kit (model G006612-0) provides the additional required
landing spaces.
In other applications, local codes may not allow wire nut connections within
the main electrical panel. The installer must then add an additional gang box
to accommodate these connections. However, an additional gang box is not
required with the dual neutral/ground kit. After the auxiliary grounding bar
is installed, a jumper wire is installed between the bar and ground post. This
allows installers to connect the branch wiring directly to the switch by
providing the means to ground each circuit within the pre-wired switches.
NOTE: The dual neutral/ground kit cannot be used in both applications
simultaneously. It must be used for either neutral only, or ground only.
50A Automatic Transfer Switch Owner’s Manual
9
Installation
Connecting Start Circuit Wires
Control system interconnections consist of N1, N2, and T1, and leads 23, 194
and 0 (see Figure 3-3).
NOTE: To simplify installation, Generac Composite Tray Cable control wiring
color codes match the label on the control module.
The generator control wiring is a Class 1 signaling circuit. Reference
instruction manual of specific engine generator for wiring connection details.
Screw heads are straight bladed and cross-bladed, and should be tightened to
3.5 in-lb (0.4 Nm). Recommended wire gauge is No. 18 AWG.
Exception: Conductors of AC and DC circuits, rated 1000 volts nominal, or
less, shall be permitted to occupy the same equipment, cable, or conduit. All
conductors shall have an insulation rating equal to at least the maximum
circuit voltage applied to any conductor within the equipment, cable, or
conduit. See NEC 300.3(C)(1).
T1 N1 N2 0 GROUND 194 +12V 23 TRANSFER
Replace with Littlefuse® 021606.3MXHP,
Optifuse® FCD-6.3A or
Generac 10000005117 250 vac, 6.3A
T1
N1
N2
A
004776
T1 (fused) — Battery Charge N1 (fused) — Utility Sense N2 (fused) — Utility
Sense 0 — Ground (not required) 194 — + 12 VDC 23 — Transfer Control A– 240
VAC, 6.3A Fuses
Figure 3-3. Typical Connections
Table 3-1. Customer Wiring Connections Integrated PCB (non-SACM)
Terminal Numbering Decal
Wire Numbers
BLUE*
T1–Fused 120 VAC for battery charger
YELLOW
N1–Fused 240 VAC Sensing for utility dropout and pickup
YELLOW WITH BLACK STRIPE
N2–Fused 240 VAC Sensing for utility dropout and pickup
BLACK
0–DC (-) Not required
RED
194–DC (+) 12 VDC for transfer controls
WHITE
23–Transfer control signal wire
- Required to supply utility or generator voltage to the generator battery charger.
Installing Branch Circuit Conductors USA Installations
1. Select which branch circuits will be protected by the generator in the
normal power panel board.
2. Turn the circuit breaker in the normal power panel board to the off
position.
3. Remove the ungrounded (hot) conductor from the circuit breaker and neutral
conductor from the neutral terminal bar in the normal power panel board.
NOTE: If the circuit to be protected is part of a multi-wire branch circuit,
the entire multi-wire branch circuit has to be relocated to the transfer
switch panel board. (See NEC 210.4) The branch circuit wiring can be removed
from the normal power panel board and installed in the transfer switch panel
board, or spliced onto new branch circuit wiring originating from the transfer
switch panel board.
4. If the normal power panel board is being used as a junction box for the
protected branch circuit conductors, install an NEC approved conduit(s),
raceway(s), or other approved wiring method between the transfer switch panel
board and normal power panel board.
5. Install properly sized branch circuit conductors between the transfer
switch panel board to the branch circuit conductors to be protected by the
transfer switch.
6. Use listed wire nuts or any other approved termination device to connect
the branch circuit conductors.
7. Install the provided label on the existing panel board that indicates the
location of the disconnecting means for the pass through conductors.
10
50A Automatic Transfer Switch Owner’s Manual
Installation
8. If the generator protected branch circuit conductors are being re-
installed into the transfer switch panel board, punch the required sized
hole(s) for the cable, conduit, or raceway.
9. Route the branch circuit conductors into the transfer switch and terminate
the equipment ground conductor on the equipment ground terminal bar, the
neutral on the neutral terminal bar, and the ungrounded (hot) on the circuit
breaker terminal.
10. Size all conductors, raceways, conduits, and junction boxes, if required,
to the applicable NEC code articles and follow the NEC installation
requirements for the wiring method(s) selected.
NOTE: For outdoor installations, any entry into the transfer switch enclosure
that is above the level of uninsulated live parts shall use fittings listed
for use for wet locations to maintain the NEMA 3R rating of the enclosure. The
wiring methods installed shall be listed for use in wet locations.
Installing Branch Circuit Conductors Canadian Installations
1. Select which branch circuits will be protected by the generator in the
normal power panel board. Turn the circuit breaker in the normal power panel
board to the off position.
2. Remove the ungrounded (hot) conductor from the circuit breaker and neutral
conductor from the neutral terminal bar in the normal power panel board.
NOTE: If the circuit to be protected is part of a multi-wire branch circuit,
the entire multi-wire branch circuit has to be relocated to the transfer
switch panel board.
3. The Canadian Electric Code prohibits the use of the normal power panel
board as a junction box, the generator protected branch circuit wiring will
have to be relocated to a properly sized junction box, or reinstalled into the
transfer switch panel board.
4. Punch the required sized hole(s) for the cable, conduit, or raceway.
5. Route the branch circuit conductors into the transfer switch and terminate
the equipment ground conductor on the equipment ground terminal bar, the
neutral on the neutral terminal bar, and the ungrounded (hot) on the circuit
breaker terminal.
6. Size all conductors, raceways, conduits, and junction boxes, if required,
to the applicable CEC code articles and follow the CEC installation
requirements for the wiring method(s) selected.
NOTE: For outdoor installations, any entry into the transfer switch enclosure
that is above the level of uninsulated live parts shall use fittings listed
for use for wet locations to maintain the NEMA 3R rating of the enclosure. The
wiring methods installed shall be listed for use in wet locations.
Installing Breakers
IMPORTANT NOTE: AFCI and GFCI breakers are not provided by the factory. If the
circuits to be protected require AFCI or GFCI protection, or both, then listed
protection shall be provided by the installer. The factory-supplied breakers
can be changed by the installer. Install listed and labeled circuit breakers
that are compatible with the transfer switch (see Transfer Switch Features).
Follow all applicable NEC and CEC code articles for any field modifications.
See Figure 3-4. Insert the tab on the breaker (A) into the hook on the bus
(B). Push the breaker into the bus until it snaps into place.
B
A
Figure 3-4. Installing Breakers
000362
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Installation
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50A Automatic Transfer Switch Owner’s Manual
Section 4: Operation
Operation
Functional Tests and Adjustments
Following transfer switch installation and interconnection, inspect the entire
installation carefully. A competent, qualified electrician should inspect it.
The installation must 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)
See Figure 4-1. A manual transfer handle (D) is shipped with the transfer
switch.
IMPORTANT NOTE: Manual operation must be done prior to electrical operation.
This is to reset the toggle after shipping and to verify there are no wiring
obstructions near moving parts. To check manual operation, proceed as follows:
1. Verify the generator is in the OFF mode. 2. Turn OFF or OPEN both UTLITY
and
EMERGENCY power supplies to the transfer switch, with whatever means provided
(such as the main line circuit breakers). 3. Note position of transfer
mechanism main contacts by observing the movable contact carrier arm. · Manual
operation handle towards the top of switch mechanism–LOAD terminals (T1, T2)
are connected to STANDBY terminals (E1, E2). · Manual operation handle towards
the bottom of switch mechanism–LOAD terminals (T1, T2) are connected to
UTILITY terminals (N1, N2).
CAUTION
Equipment damage. Do not use excessive force while manually operating the
transfer switch. Doing so could result in equipment damage.
(000122)
Close to Normal Source Side
See Figure 4-1. Before proceeding, verify the position of the switch by
observing the position of the transfer switch operating lever (C) and manual
transfer handle (D).
A
A
C
B
C D
D B
C
D 002751
A
Load connected to standby power source
B
Load connected to utility power source
C
Transfer switch operating lever
D
Manual transfer handle
Figure 4-1. Actuating Transfer Switch
If the handle is down (A), the contacts are closed in the normal position. No
further action is required. If the handle is UP (B), proceed.
With the handle inserted into the actuating shaft, move handle DOWN. Be sure
to hold on to the handle as it will move quickly after the center of travel.
50A Automatic Transfer Switch Owner’s Manual
13
Operation
Close to Emergency Source Side
See Figure 4-1. Before proceeding, verify the position of the switch by
observing the position of the manual transfer handle (D). If the handle is UP,
the contacts are closed in the EMERGENCY (Standby) position. No further action
is required. If the handle is down, proceed. With the handle inserted into the
actuating shaft, move the handle UP. Be sure to hold on to the handle as it
will move quickly after the center of travel.
Return to Normal Source Side
Manually actuate switch to return manual operating handle to the DOWN
position.
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. Refer to the DMM manufacturer’s literature for additional
information.
Utility Voltage Checks
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)
1. Turn ON the UTILITY power supply to the transfer switch with whatever
means provided (such as the UTILITY main line circuit breaker).
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.
3. When certain that UTILITY supply voltage is correct and compatible with
transfer switch ratings, turn OFF the UTILITY supply to the transfer switch.
Generator Voltage Checks
DANGER
Electrocution. High voltage is present at transfer switch and terminals.
Contact with live terminals will result in death or serious injury.
(000129)
1. On the generator panel, select the MANUAL mode of operation. The generator
should crank and start.
2. Let the generator stabilize and warm up at no-load for at least five
minutes.
3. Set the generator main circuit breaker (CB1) to ON or CLOSED.
4. With an accurate AC voltmeter and frequency meter, check the no-load,
voltage and frequency. Measure across ATS terminal lugs E1 to E2; E1 to
NEUTRAL and E2 to NEUTRAL.
Frequency Terminals E1 to E2 Terminals E1 to NEUTRAL Terminals E2 to NEUTRAL
6062 Hz 240246 VAC 120123 VAC 120123 VAC
5. When certain that generator supply voltage is correct and compatible with
transfer switch ratings, turn OFF the generator supply to the transfer switch.
6. Set the generator main circuit breaker (CB1) to OFF or OPEN. Allow the
generator to cool down for one minute.
7. On the generator panel, select the OFF mode to shut down the generator.
Do NOT proceed until generator AC output voltage and frequency are correct and
within stated limits. If the noload voltage is correct but no-load frequency
is incorrect, the engine governed speed may require adjustment. If no-load
frequency is correct but voltage is not, the voltage regulator may require
adjustment.
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50A Automatic Transfer Switch Owner’s Manual
Operation
Generator Tests Under Load
1. Turn OFF the utility power supply to the transfer switch with whatever
means provided (such as the utility main line circuit breaker).
2. Set the generator main circuit breaker to OFF or OPEN.
3. Manually actuate the transfer switch main contacts to the emergency
(Standby) position. See Manual Operation. To start the generator, select the
MANUAL mode of operation. When engine starts, let it stabilize for a few
minutes.
4. Set the generator main circuit breaker to ON or CLOSED. The generator now
powers all LOAD circuits. Check generator operation under load as follows:
· Turn on electrical loads to the full rated wattage/ amperage capacity of the
generator. DO NOT OVERLOAD.
· With maximum rated load applied, check voltage and frequency across transfer
switch terminals E1 and E2. Voltage should be greater than 230 volts (240 VAC
system); frequency should be greater than 59 Hz.
· Let the generator run under rated load for at least 30 minutes. With unit
running, listen for unusual noises, vibration, overheating, etc., that might
indicate a problem.
5. When checkout under load is complete, set main circuit breaker of the
generator to the OFF or OPEN position.
6. Let the generator run at no-load for several minutes. Then, shut down by
selecting the OFF mode.
7. Move the main switch contacts back to UTILITY.
NOTE: See Manual Operation. Handle and operating lever of transfer switch
should be in down position.
8. Turn on the utility power supply to transfer switch, using whatever means
provided (such as a utility main line circuit breaker). The utility power
source now powers the loads.
9. The system is now set for fully automatic operation.
Checking Automatic Operation
To check the system for proper automatic operation, proceed as follows:
1. Verify generator is in OFF mode. 2. Install front cover of the transfer
switch. 3. Turn the utility power supply to the transfer switch
ON, using the utility main line circuit breaker. 4. Set the generator main
circuit breaker to ON. 5. On the generator panel, select AUTO. The system
is now ready for automatic operation. 6. Turn utility power supply to the
transfer switch OFF.
With the generator ready for automatic operation, the engine should crank and
start when the utility source power is turned OFF after a ten second delay
(factory default setting). After starting, the transfer switch should connect
load circuits to the standby side after a five (5) second delay. Let the
system operate through its entire automatic sequence of operation.
Shutting Generator Down While Under Load
IMPORTANT NOTE: To avoid equipment damage, follow these steps, in order, when
shutting the generator down during utility outages. Shutdowns may be required
during outages to perform routine maintenance or to conserve fuel.
To turn the generator OFF (while running in AUTO and on-line):
1. Turn the main utility disconnect OFF (OPEN). 2. Turn the generator MLCB
(generator disconnect)
to OFF (OPEN). 3. Run the generator for approximately one minute for
proper cooling. 4. Turn the generator OFF.
To turn the generator back ON:
1. Put the generator into AUTO. 2. Start generator and warm up for a few
minutes. 3. Set the MLCB (generator disconnect) to ON
(CLOSED).
The system now operates in automatic mode. The main utility disconnect can be
turned ON (CLOSED).
To shut the unit off, repeat this entire process.
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.
50A Automatic Transfer Switch Owner’s Manual
15
Operation
Fuse Removal and Installation
See Figure 4-2. A fuse removal and installation tool (A) is included in the
control housing.
T1 N1 N2 0 GROUND 194 +12V 23 TRANSFER
Replace with Littlefuse® 021606.3MXHP,
Optifuse® FCD-6.3A or
Generac 10000005117 250 vac, 6.3A
T1
N1
N2
A
004776
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 control housing retainer
directly above the fuses, with the large thumb tab facing out. Use only
Generac replacement fuses–part number 100000005117, rated 240 VAC, 6.3 Amps,
10,000 AIC. Alternative fuses are Littelfuse® 021606.3MXHP or Optifuse®
FCD-6.3.
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50A Automatic Transfer Switch Owner’s Manual
Section 5: Drawings and Diagrams
Installation Diagram, 10 Circuit Panelboard
(Drawing 10000001392)
Drawings and Diagrams
EXPLODED VIEW:
10 CIRCUIT PANELBOARD
DRAWING #: 10000001392
GROUP C
PAGE 1 OF 1
REVISION: A DATE: 03/01/16
50A Automatic Transfer Switch Owner’s Manual
17
Drawings and Diagrams
Installation Diagram, 10 Circuit Transfer Switch
(Drawing 10000019007–page 1 of 2)
18
50A Automatic Transfer Switch Owner’s Manual
Installation Diagram, Canadian
(Drawing 10000019007–page 2 of 2)
Drawings and Diagrams
50A Automatic Transfer Switch Owner’s Manual
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Drawings and Diagrams
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50A Automatic Transfer Switch Owner’s Manual
Drawings and Diagrams
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Drawings and Diagrams
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50A Automatic Transfer Switch Owner’s Manual
Part No. 1000018951 Rev A
09/01/17
©2017 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 Power Systems | A total energy solutions company
- Product Information, User Manuals, & Support
- Generac Power Systems | A total energy solutions company
- P65Warnings.ca.gov