Danfoss NXN NFE VACON NXP Air Cooled User Manual

Danfoss NXN NFE VACON NXP Air Cooled

Specifications

• Product Type : AC Drives
• Model: Non-Regenerative Front End Unit (NFE)

**SAFETY

**

ONLY A COMPETENT ELECTRICIAN MAY CARRY OUT THE ELECTRICAL INSTALLATION

Warnings

1. The components of the power unit circuit are live when the Non-Regenerative Front End is connected to AC supply. Coming into contact with this voltage is extremely dangerous and may cause death or severe injury. The control unit is isolated from the main potential. The control I/O-terminals are isolated from the mains
2. potential. However, the relay outputs and other I/O-terminals may have dangerous control voltage present even when the Non-Regenerative Front End is disconnected from the AC supply.
3. Do not touch the components on the circuit boards. Static voltage discharge may damage the components.

Safety Instructions

1. The Non-Regenerative Front End, AC choke and optional components are meant for fixed installations only.
2. Do not perform any measurements when the Non-Regenerative Front End is connected to the AC supply.
3. After having disconnected the Non-Regenerative Front End from the AC supply, wait until the fan stops. Wait 5 more minutes before doing any work on the Non-Regenerative Front End connections. Do not even open the cover before this time has expired.
4. Do not perform any voltage withstand tests on any part of the Non-Regenerative Front End. There is a certain procedure according to which the tests must be performed. Ignoring this procedure may result in a damaged product.
5. Before connecting the Non-Regenerative Front End to AC supply, make sure that the Non-Regenerative Front End front and cable covers are closed.
6. Before doing any work on the Common DC bus, the system must be grounded.

Grounding
The Non-Regenerative front-end unit and AC choke must always be grounded with a grounding conductor connected to the grounding terminal.

Warning symbols
For your safety, please pay special attention to the instructions marked with the following symbols:

• caution = Dangerous voltage
• warning: = General warning
• HOT SURFACE = Hot surface Risk of burn

NOTE! You can download the English and French product manuals with applicable safety, warning and caution information from https://www.danfoss.com/en/service-and-support/.

EU DIRECTIVE

CE marking
The CE marking on the product guarantees the free movement of the product within the EEA (Euro-pean Economic Area). It also guarantees that the product complies with applicable directives (for example, the EMC directive and other possible so-called new method directives). VACON® NX Non-Regenerative Front End carries the CE label as proof of compliance with the Low Voltage Directive (LVD) and the Electro Magnetic Compatibility (EMC) directive. SGS FIMKO has acted as the Notified Body.

EMC directive

Introduction

• The EMC Directive provides that the electrical apparatus must not excessively disturb the environ-ment it is used in, and, on the other hand, it must have an adequate level of immunity toward other disturbances from the same environment.
• The compliance of VACON® NX Non-Regenerative Front End with the EMC directive is verified with Technical Construction Files (TCF) and checked and approved by SGS FIMKO, which is a Notified Body. The Technical Construction Files are used to authenticate the conformity of VACON® NX Non-Regenerative Front End with the Directive because it is impossible to test such a large product family in a laboratory environment and because the combinations of installation vary greatly.

Technical criteria
Our basic idea was to develop a range of VACON® NX Non-Regenerative Front End offering the best possible usability and cost efficiency. EMC compliance was a major consideration from the outset of the design.

VACON® Non-Regenerative Front End EMC classification
Factory delivered VACON® NX Non-Regenerative Front End are Class T equipment, which fulfills all EMC immunity requirements (standard EN 61800-3).

Class T: Class T equipment has a small earth leaking current and can be used with floating DC input.
Warning: This product is of the restricted sales distribution class according to IEC 61800-3. In residential areas, this product may cause radio interference in which case the user may be required to take adequate measures.

Manufacturer’s declaration of conformity
The following page presents the photocopy of the Manufacturer’s Declaration of Conformity assuring the compliance of VACON® NX Non-Regenerative Front End with the EMC-directives.

EU DECLARATION OF CONFORMITY

RECEIPT OF DELIVERY
VACON® NX Non-Regenerative Front End has undergone scrupulous tests and quality checks at the factory before they are delivered to the customer. However, after unpacking the product, check that no signs of transportation damage are to be found on the product and that the delivery is complete
(compare the type designation of the product to the codes below, see Figure 3-1 and Figure 3-2).

• Should the product have been damaged during the shipping, please contact primarily the cargo insurance company or the carrier.
• If the delivery does not correspond to your order, contact the supplier immediately.

Type designation code for the NFE unit
In the VACON® type designation code for Common DC Bus components, the Non- Regenerative Front End Unit is characterized by letter N and letter N or S. If the Non-Regenerative Front End unit is ordered by letter N delivery is not include anything else than the unit itself. If the letter S is used delivery includes the unit, the AC choke.

NOTE! Delivery does NOT include any auxiliary devices that are needed for proper operation (the AC or DC fuses, the fuses bases, the main contactor or circuit breaker etc.) The customer must take care of them.

Type designation code for the AC choke
AC choke has one version which is suitable for 380-500V and 525-690V voltages.

Storage
If VACON® NX Non-Regenerative Front End is to be stored before use, make sure that the ambient conditions are acceptable:

• Storage temperature: -40…+70°C
• Relative humidity: <95%, no condensation

Maintenance
All technical devices, and drives also, need a certain amount of care-taking and failure-preventive maintenance. To maintain the trouble-free operation of the VACON® NX Non-Regenerative Front End, environmental conditions, as well as load, line power, process control, etc. have to be within specifications, determined by the manufacturer.

• If all conditions are by the manufacturer’s specifications, there are no other concerns, but to provide a cooling capacity high enough for the power- and control circuits. This requirement can be met by making sure, that the cooling system works properly. The operation of cooling fans and the cleanness of the heat sink should be verified regularly.
• Regular maintenance is recommended to ensure trouble-free operation and a long lifetime of VACON® NX Non-Regenerative Front End. At least the following things should be included in the regular maintenance.
• It may also be necessary to check the tightening torques of terminals at certain intervals.
• It is also recommended to record all actions and counter values with dates and times for follow-up of maintenance. It may also be necessary to check the tightening torques of terminals at certain intervals.

Lifting the Modules

• The modules can be lifted by the holes on top. Place the lifting hooks symmetrically in at least four holes. The maximum allowed lifting angle is 45 degrees. For enclosures FI9, see Figure 3-3.
• The lifting equipment must be able to carry the weight of the module.

Lifting the AC choke
The AC choke can be lifted by the holes on top. Place the lifting hooks symmetrically in two holes. The maximum allowed lifting angle is 45 degrees. Lifting points for the AC choke, see Figure 3-4.

Warranty

• Only manufacturing defects are covered by the warranty. The manufacturer assumes no responsibility for damages caused during or resulting from transport, receipt of the delivery, installation, commissioning or use.
• The manufacturer shall in no event and under no circumstances be held responsible for damages and failures resulting from misuse, wrong installation, unacceptable ambient temperature, dust, corrosive substances or operation outside the rated specifications.
• Neither can the manufacturer be held responsible for consequential damages.
• The Manufacturer’s warranty period is 18 months from the delivery or 12 months from the commissioning whichever expires first (General delivery terms NL92/Orgalime S92).
• The local distributor may grant a warranty time different from the above. This warranty time shall be specified in the distributor’s sales and warranty terms. The manufacturer assumes no responsibility for any other warranties than that granted by the manufacturer itself.
• In all matters concerning the warranty, please contact your distributor first.

NON-REGENERATIVE FRONT END (NFE)

Introduction

• The VACON® NX Non-Regenerative Front End is used to transfer power between the AC input and intermediate DC circuit. The VACON® NX Non-Regenerative Front End has only a one-way function. This means that power can only be transferred from the AC input to the intermediate DC circuit. If braking is needed, the brake chopper has to be connected to the intermediate DC circuit.
• In a typical VACON® NX Non-Regenerative Front End configuration, the desired number of Inverters, Figure 4-1, are connected to the intermediate DC circuit.
• The Non-Regenerative front-end configuration consists of the unit itself, AC choke, AC fuses, main contactor and DC fuses, Figure 4-2.

Non- Regener at i ve Fr ont End (NFE)

Non-Regenerative Front End enclosure sizes

Non-Regenerative Front End unit technical data

Mains connection| Input voltage Uin| 380 – 690 Vac; – 15%…+10%, EN 60204- 1
---|---|---
Input frequency| 45…66 Hz
Continuous input current| IH: Ambient temperature max. +40°C, overload 1.5 x IH (1 min./10 min.)

IL: Ambient temperature max. +40°C,

overload 1.1 x IL (1 min./10 min.)

Connection to mains| Unlimited (internal overload protections)
Current THD| Depend on additional chokes ( normal case < 40 %)
Starting delay| Depend on dc bus capacitance (max 10 s)
Unexpected input power break| Shorter breaks than 40ms works normally if DC does not drop remarkably. Longer break means normal starting operation (charging current varies according to load).
DC

connection

| Output voltage Uout| 465…800Vdc ( 380- 500 Vac);

640…1100Vdc ( 525- 690 Vac);

Efficiency| >98%
DC bank capasitance| 6.8µF (included 10 M  discharging resistor)
Contr ol char ac- ter istics| Control method| NFE is an independent power unit. Charging and pr otections controlled by NFE itself.
Ambient condi- t ions| Ambient operating tempera- ture| H L
Storage temperature| –40°C…+70°C
Relative humidity| 0 to 95% RH, non- condensing, non- corrosive, no dripping water
Air quality:

–          chemical vapours

–          mechanical particles

| ****

IEC 721- 3-3, unit in operation, class 3C2 IEC 721- 3-3, unit in operation, class 3S2

Altitude| 100% load capacity (no derating) up to 1,000 m

1-% derating for each 100m above 1000.; max. 2000m

Vibration

EN50178/EN60068-2- 6

| Displacement amplitude 0.
Shock

EN50178, EN60068-2-27

| UPS Drop Test (for applicable UPS weights)

Storage and shipping: max 15 G, 11 ms (in package)

Cooling air required| 1150 m3/h
Enclosure class| IP00/Open type standard size in the kW/HP range
EMC

(at default set- t ings)

| Immunity| Fulfil all EMC immunity requirements. Can be chosen N-, L- or T- level.
Safety|  | CE, UL, CUL

EN 61800- 5-1 (2003); (see unit nameplate for more detailed approvals)

Contr ol connec- t ions| Display| LCD
Trip information| Relay I/O
Auxiliary voltage| +24 V, +/- 20%, max. load 50 m A
Analogue output| 0(4)- 20 mA, RL=500 Ohm
Digital output| Open collector, max. Load 48V/50 mA
Relay outputs| Max switching load: 250Vac/2A or 250Vdc/0.4 A
Pr otections| Unit over temperature pro- tection| Trips if temperature r ising over tr ip level (default)
Current measurement| Trips if current over tr ip level (default)
Supply phase supervision| Trips if any of the output phases is missing (default)

Table 4-1. Technical specification for VACON® NX Non-Regenerative Front End unit

Application
The VACON® NX Non-Regenerative Front End needs a special application. The unit is delivered with that application. If an application code is needed please contact the manufacturer. More application information can be found in this manual.

Diagrams

Connection between control unit and power unit
The communication connections between the Non-Regenerative Front End power unit and the control unit is established using serial cable, Figure 4-4. The control unit is located under the front cov-er of the power unit. The control unit cannot be placed outside of the power unit.

Non-Regenerative Front End power ratings

VACON® NXN; DC voltage 460 800V

 | Unit| Low oveload (AC current)| High oveload (AC current)| DC Power (continuous)
---|---|---|---|---
Type| Code| Enclosure| IL-cont [A]| I1min [A]| IH-cont [A]| I1min [A]| 400V mains P [kW]| 500 V mains P [kW]
NFE| NXN_0650 6| FI9| 650| 715| 507| 793| 410| 513

Table 4-2. Power ratings of VACON® NXN, supply voltage 460 800Vdc

For dimensions of NXN units, see Table 4-4 and AC choke Table 4-5.

• Note: The rated currents in the given ambient (+40°C).
• Note: The motor output power: Pout=Pdc x (Eff. INU x Eff. Motor).
  • Pdc = NFEs DC power
  • Eff.Efficiency  of the inverter
  • Eff.Motor= efficiency of the motor

VACON® NXN; DC voltage 640 1100V

 | Unit| Low overload (AC )| High overload (AC )| DC Power (continuous)
---|---|---|---|---
Type| Code| Enclosure| IL-cont [A]| I1min [A]| IH-cont [A]| I1min [A]| 690V mains P [kW]
NFE| NXN_0650 6| FI9| 650| 715| 507| 793| 708

Table 4-3. Power ratings of VACON® NXN, supply voltage 640 1100Vdc

For dimensions of the NXN unit, see Table 4-4 and AC choke Table 4-5.

• Note: The rated currents in the given ambient (+40°C).
• Note: The motor output power: Pout=Pdc x (Eff. INU x Eff. Motor).
  • Pdc = NFEs DC power
  • Eff.INU= efficiency of the inverter
  • Eff.Motor =efficiency of the motor

Non-Regenerative Front-End unit Dimensions

AC choke Dimensions

Table 4-5. AC choke dimensions

Note: More detailed dimensions can be found in Appendix 7-5.

Non-Regenerative Front End Fuse selection

Introduction

• AC fuses are used to protect the input network in case the Non-Regenerative Front End unit or the AC choke is faulty. DC fuses are used to protect the Non-Regenerative front-end unit and the AC choke in case there is a short circuit in the DC buses. If DC fuses are not used, short circuits in the DC buses will cause loading of the Non-Regenerative Front End unit. Vacon Ltd will not assume any responsibility for damages caused by insufficient protection.

Fuses; mains voltage 380 690V

AC fuses

Module AC fuses

Type| Code| Enclosure| __

Ferraz Shawmut type [aR]*

| UN [V]| __

IN [A]

| __

Size

| __

Q’ty

NFE| NXN_0650 6| FI9| NH3UD69V1000PV| 690| 1000| 3| 3

Table 4-6. Ferraz Shawmut AC fuse selection, mains voltage 380 690Vac

Module AC fuses

Type| Code| Enclosure| Bussman type [aR]*| UN [V]| __

IN [A]

| __

Size

| __

Q’ty

NFE| NXN_0650 6| FI9| 170M6466| 690| 1250| 3BKN/50| 3

Table 4-7. Bussman AC fuse selection, mains voltage 380 690Vac

Note: All fuses are blade-type. If some other type is needed please contact your nearest distributor.

DC fuses

Module DC fuses

Type| Code| Enclosure| Ferraz Shawmut type [aR]*| UN [V]| __

IN [A]

| __

Size

| __

Q’ty

NFE| NXN_0650 6| FI9| PC73UD11C13CTF| 1100| 1250| 73(LR)| 2

Table 4-8. Ferraz Shawmut DC fuse selection, mains voltage 465 1100Vdc

Module DC fuses

Type| Code| Enclosure| Bussman type [aR]*| UN [V]| __

IN [A]

| __

Size

| __

Q’ty

NFE| NXN_0650 6| FI9| 170M8610| 1000| 1000| 3BKN/75| 2

Table 4-9. Bussman DC fuse selection, mains voltage 465 1100Vdc

Note: All fuses are flush-end type. If some other type is needed please contact your nearest distributor.
Non-regenerative Front End unit circuit Breaker selection

The Non-Regenerative Front End can also be protected by a circuit breaker. The recommended type of circuit breaker is shown in Table 4-10. If a circuit breaker from another manufacturer is used, it must be equivalent to the circuit breaker shown. Further information on the circuit breaker shown is available from the manufacturer. Circuit breakers do not provide the same level of protection as fuses. A circuit breaker can be used without a main contactor. The circuit breakers shown are suitable for equipment rated at 380 690 V.

Table 4-10. Circuit breaker for VACON® NXN

Non-Regenerative Front End Unit Main contactor
If a main contactor is to be used, the type shown in Table 4-11 is recommended. If a contractor from another manufacturer is used, it must be equivalent to the types shown. Further information on the contactor shown is available from the manufacturer.

Pre-charging and start-up

• The external pre-charging circuit is not needed with the Non-Regenerative Front End. Pre-charging is done by controlling the actors and the DC link voltage is charged smoothly. Pre-charging is currently l limit control-led. Due to this, the charging time varies depending on DC link capacitance. The Non-
• Regenerative Front End performs charging when the main contactor is closed and a start signal is applied to DIN1. The NFE goes into run mode after successful charging. If Non- regenerative Front
• Ends are connected in parallel, each module charges the DC link voltage independently. Parallel-connected modules can be connected to the supply simultaneously or one module at a time. See Appendix 7-2 for the circuit diagram of parallel connected NFE modules.
• The Non-Regenerative Front End monitors the pre-charging process. If the time of charging is over the adjustable pre-charging monitoring time (default 10s) a fault is indicated. If the DC link capacitance is so high that the default value for charging monitoring is not enough, the value can be increased.

Paralleling

• The power of the input group can be increased by connecting several Non-Regenerative front-end units in parallel. No communication between the units is required; they work independently.
• Each Non-Regenerative Front-end unit connected in parallel must have its own short-circuit protection on the AC and DC sides. The fuses are selected under Section 4.9. When paralleling, attention must be paid to the sufficient short-circuit capacity of the system.
• The derating of Non-Regenerative front-end units connected in parallel is 5% of the DC power; this should be taken into account when selecting the input unit.
• If a device is to be isolated from the AC and DC voltages, and other Non-Regenerative Front-end units connected in parallel are also to be used, separate isolators are required in the AC input and DC output. The AC input can be isolated using a compact circuit breaker, an ordinary circuit breaker or a fuse switch. Contactors are not suitable for isolating the AC input because they cannot be locked in a safe position. The DC output can be isolated using a fuse switch. A load isolation switch or safety isolation switch can be used for this. The device can also be connected to mains even when the other devices connected in parallel are already connected and running. After this, the device can be connected to the intermediate circuit.

Note: Parallel connection means that the AC supply of more than one unit connected from the DC link is coupled with the same supply transformer.

pulse solution
In a 12-pulse solution, the supply transformer has two galvanically separated secondary circuits, see Appendix 7-3. The 12-pulse solution can reduce the effect of harmonic waves of the current in the supply network. To reduce the effect of harmonics, there must be a phase displacement of 30º between the secondary circuits of the transformer. The phase displacement is implemented by connecting one secondary circuit to the triangle and the other to the star. In a 12-pulse solution, there must be an equal number of non-regenerative units connected to both secondary coils of the supply transformer.

Derating
The output power has to be derated in one of the following cases:

• The ambient temperature is more than 40ºC
• Installation altitude is more than 1000 m

As the Ambient Temperature
The power rating of the Non-Regenerative Front End unit is valid for an ambient temperature of 40ºC. If the device is to be used in higher ambient temperatures, its power rating must be subjected to derating. The derating coefficient is 1.5%/1ºC, for ambient temperatures not exceeding 50ºC. The reduced power is calculated using the formula:

• P = P ((100%− (t − 40ºC)x)/100)
• Pn = nominal power of the unit
• t = ambient temperature
• x = derating coefficient

Non- Regener at i ve Front End (NFE)

As the Installation altitude
The power rating of the Non-Regenerative Front End unit is valid for a maximum installation altitude of 1,000 m (380-690 V). If the device is to be used in higher installation altitudes, its power rating must be subjected to derating. The derating coefficient is 1.5%/100m. The power rating of the device can be reduced to a maximum installation altitude of 3,000 m (380V- 500V) or of 2000 m (525V-690V). The reduced power is calculated using the formula:

• Pae = P 100% – (hins – Mbase) x)/100)
• Pn = nominal power of the unit
• hinst = intended installation altitude
• hbase = 1,000 m
• x = derating coefficient

Note : If a higher installation altitude than 3,000 m is required please contact your nearest distributor to get more information.

INSTALLATION

Mounting
The equipment mounting must be sturdy enough to carry the weight of the equipment. The enclosure class of the equipment will depend on the mounting and solutions to be used. The equipment mounting must provide sufficient shielding for contact of the live parts (IP2x). The installation and mounting must comply with local laws and regulations.

Non-Regener at ive Front End Unit
The Non-Regenerative Front End can be mounted in a vertical position on the backplane of a cubicle. Enough space must be reserved around the Non- Regenerative Front End to ensure sufficient cool ing, see Figure 5-5. For low the minimum dimensions for installation, see Table 5-1. Required cool ing air capacity and minimum air holes on the switchgear, see Table 5-2. Also, make sure that the mounting plane is relatively even. The Non-Regenerative Front End is fixed with four bol ts, Figure 5-1.

AC choke

The AC choke can only be mounted in a vertical position on the floor of a cubicle. Enough space must be reserved around the AC choke to ensure sufficient cooling, see Figure 5-7. Follow the minimum dimensions for installation, see Table 5-3. Required cooling air capacity and minimum air holes on the switchgear, see Table 5-4. Also, make sure that the floor is relatively even. AC choke must be attached properly so that it will not be able to move.

AC choke can be mounted so that the connectors face forward or so that they face to the side. Figure 5-2 presents a mounting where the connectors face forward. Figure 5-3 presents a mounting where the connectors face to the side. This mounting is recommended if the Non-Regenerative Front End units are parallel connected. In this case, it must be assured that the connectors face to the same direction and that there is enough space between the connectors and the AC choke.

Control Box
The Control unit of the Non-Regenerative Front End unit is mounted under the front cover of mod-ule, see Figure 5-4. VACON® alphanumeric display and the navigation wheel can be used for pa-rameterization and monitoring of the Non-Regenerative Front End unit.

Cooling

Non-Regenerative Front End unit
Enough free space must be left around the Non-Regenerative Front End unit to ensure sufficient air circulation and cooling. You will find the required dimensions for free space in the table below. You will find the required cooling air, minimum air holes and heat dissipation in Table 5-2.
When planning the cooling for the space, take into consideration that the Non- Regenerative Front End unit heat loss is approx. 1% of the nominal capacity. For air flow, see Figure 5-6.

• A = free space above the unit
• B = distance between inverter and cabinet wall
• C = free space underneath of the units
• D = distance between two units

AC choke
Enough free space must be left around the AC choke to ensure sufficient air circulation and cooling. You will find the required dimensions for free space in the table below. You will find the required cooling air, minimum air holes and heat dissipation in the Table 5-4.
When planning the cooling for the space, take into consideration that the AC choke heat loss is approx. 0.5% of the nominal capacity.

• A = free space above the AC choke
• B = distance between AC choke and cabinet wall
• C = free space under the AC choke
• D = distance between AC choke and cabinet wall
• E = distance between AC choke and cabinet wall

Arranging ventilation of the enclosure

The enclosure door must be provided with air gaps for air intake. To achieve sufficient cooling inside the cabinet, the dimensions for the total area of free openings for incoming air given in Table 5-2 and Table 5-4 must be followed. For instance, there could be two screened gaps as presented in Figure 5-8 ( s recommendation). This layout ensures sufficient airflow to the module fans as well as cooling of the additional components.

Air outlet gaps must be situated on top of the cabinet. The minimum effective air outlet area per unit frame is given in Table 5-2 and Table 5-4. The cooling arrangements inside the cabinet must be such that they prevent hot output air from mixing with the incoming fresh air (see Chapter 5.2.4).
The ventilation gaps must fulfil the requirements set by the selected IP class. The examples in this manual apply to protection class IP21.

During operation, air is sucked in and circulated by a fan blower at the bottom of the power unit. If the power unit is placed in the upper part of the cabinet, the fan blower will be in the middle of the cabinet, at the height of the upper ventilation grid. In case of the AC choke is installed below the Non-Regenerative Front End unit air inlet 1.1 in Figure 5-8 cannot be used.

1. Cooling air inlets
2. Hot air exhaust

Steering air flow
Cooling air must be taken in through the ventilation gaps on the door and blown out at the top of the enclosure. To steer the hot air from the power unit to the outlet at the top of the enclosure and pre-vent it from circulating back to the fan blower, use either of the following arrangements:

• A. I nstall a closed air duct from the power unit to the outlet on top of the enclosure (A in figures below).
• B. Install shields in the gaps between the power unit and the cabinet walls (B in figures below). Place the shields above the air outlet gaps at the sides of the module.

The sheet metal airflow guides (deflectors) prevent air circulation between different sections of the equipment. The shield guides prevent air circulation inside a section. The exhaust air holes must not be covered, nor must anything be placed above them to stop the free exit of warm air from inside the equipment. The cooling air intake holes must not be blocked in any way.

The materials used for preventing the circulation of air inside the equipment must be fire-restraining. The edges must be sealed to prevent the formation of gaps. When the deflectors are made according to the instructions, no separate cooling fan is required.

• NOTE! The deflectors must be installed above the air intake holes on the top (in the front) of the unit.
• NOTE! If a flat roof is used, mount a V-shaped air guide on the underside of the roof to direct the airflow horizontally. See Figure 5-10.

Power connection

AC connection
The 3-phase input is connected to the input terminals of the AC choke (L1, L2 and L3), see Figure 5-12. Used input terminals are selected by the supply voltage. The output terminals of the AC choke (L1, L2 and L3) are connected to the input terminals of the NFE unit (L1, L2 and L3), see Figure 5-11. The AC input of the NFE input group must be protected against short circuits. The fuses suitable for protection are shown in Section 4.9. A circuit breaker can also be used for protection, see Section 4.10. The best short-circuit protection is achieved by using fuses. The short-circuit protection must be on the input side when seen from the AC choke, Figure 4-2.

A cable or busbar designed for the purpose must be used to make the connection. The connection must be dimensioned according to the nominal current rating of the Non-Regenerative Front End. The necessary overloading allowance must also be used. The connection must also have the same short- circuit capacity as the whole system. The connecting cable or busbar may be of copper or aluminium. When aluminium is used, steps must be taken to prevent corrosion. The dimensions of the terminals in the unit are indicated in Appendix 7-6.

DC connection
The DC connection of the Non-Regenerative Front End unit is connected to the terminals at the top, see Figure 5-13. The terminals are marked as B+ for connection to DC+ and B- for connection to DC-. The DC connection must be protected using DC fuses, see Section 4.9. The terminal dimensions are shown in Appendix 7-6.

Cable installation and the UL standards

• To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper cable with a minimum heat resistance of +60/75C must be used.
• Use Class 1 wire only.
• The units are suitable for use on a circuit capable of delivering not more than 100,000 rms symmetrical amperes, 600 V maximum, or equivalent when protected by class J, T or Semiconductor fuses.
• The tightening torques of the terminals are given below in Table 5-1.

I/O terminals and I/O signals
I/O terminals can be found under the cover of the Control box, see Figures 5-14 and 5-15. For descriptions of I/O signals see Figure 5-16.

NOTE! Digital signal out is open collector type.

CONTROL KEYPAD

• The control keypad is the link between the VACON® NX Non-Regenerative Front End and the user. The control keypad features an alphanumeric display and indicators for the status (READY, RUN, STOP, ALARM, FAULT) and four indicators for the active menu (REF, MON, PAR, FLT). There are also three Status Indica green and red).
• The control information, i.e. the menu number, description of the menu or the displayed value and the numeric information are presented on three text lines.
• The navigation wheel is used for navigating on the panel display. The wheel has two separate functions;
  • rotating the wheel e.g. for changing parameter value (12 steps/round)
  • pressing the wheel e.g. for accepting the new value.

Navigation

Monitoring menu

• Monitoring values mean actual values of measured signals as well as statuses of some control set-tings. Monitoring values are listed in Table 6-1.
• Pushing the navigation wheel once in this menu takes the user to the next level, where the monitor-ing value, e.g. M1.1 and value is visible (see Figure 6-2). The monitoring values can be browsed by rolling the navigation wheel clockwise.

Parameter menu

• In Parameter menu all settable parameters are visible. The parameters can be browsed by rolling the navigation wheel clockwise. Pushing the navigation wheel once in this menu takes the user to the next level, where the parameter value, e.g. P3.1 and value is visible (see Figure 6-3). Parameters are listed below.
• The following figure shows the parameter menu view:

Digital outputs

Code| Parameter| Min| Max| Default| Unit| Description
---|---|---|---|---|---|---
P1.1| Relay output 1| 0| 5| 0|  | 0 = Not used 1 = Ready

2 = Running

3 = Fault active

4 = Fault inverted 5 = Warning active

P1.2| Relay output 2| 0| 5| 0|  | 0 = Not used 1 = Ready

2 = Running

3 = Fault active

4 = Fault inverted 5 = Warning active

P1.3| Digital output 1| 0| 5| 0|  | 0 = Not used 1 = Ready

2 = Running

3 = Fault active

4 = Fault inverted 5 = Warning active

Analog outputs

Code| Parameter| Min| Max| Default| Unit| Description
---|---|---|---|---|---|---
P2.1| Analog output funtion| 0| 2| 0|  | 0 = Not used

1 = DC voltage 2 = Current

P2.2| Analog output minimum| 0| 1| 0|  | 0 = 0mA

1 = 4mA

Analog output function
If the DC voltage is selected scaling is 0/4mA = 0VDC and 20mA = 1000VDC. If the current is selected scaling is 0/4mA = 0A and 20mA = 650A.

NFE parameters

Code| Parameter| Min| Max| Default| Unit| Description
---|---|---|---|---|---|---
P2.1| Analog output function| 0| 2| 0|  | 0 = Not used

1 = DC voltage 2 = Current

P2.2| Analog output minimum| 0| 1| 0|  | 0 = 0mA

1 = 4mA

P3.1 Load time limit
If the pre-charging is longer than the level set by this parameter then a loading time fault is triggered.

P3.2 Over voltage limit
If the DC l ink vol tage is higher than the level set by this parameter then over vol tage faul t is tr iggered.

P3.3 Over current limit
If the input current is higher than the level set by this parameter then overrent fault is triggered

Fault history menu
In the Fault history menu, you can browse through 9 latest faults (see Figure 6-4). If a fault is active, the relevant fault number (e.g. F2) alternates in the display with main menu. When you browse between the faults, the fault codes of active faults are blinking. The active faults can be reset by pressing the STOP button for 1 second. If the fault cannot be reset, the blinking continues. It is possible to navigate in the menu structure also when there are active faults present, but the display returns auto-matically to the fault menu if buttons or navigation wheel are not pressed or navigation is not rotated. The operating hour, minute and second values at the fault instant are shown in the value menu (operating hours = displayed reading x 1000 h). Fault codes are listed in Table 6-2.

Note! The whole fault history can be cleared by pressing the STOP button for 5 sec time when the drive is stopped and the fault history menu is selected in the display.
Note! If the STOP button is pressed for 5 seconds and no menu is selected in the display facetory reset is done. Factory reset set all parameters to default values!

System menu

APPENDICES

Appendix 7-5. AC choke dimensions

FAQ

(Frequently Asked Questions)

Q: Where can I find local contacts for support?
A: You can find local contacts for support by visiting the following link: https://www.danfoss.com/en/contact-us/contacts-list/

Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
www.danfoss.com

References

• Engineering Tomorrow | Danfoss
• Engineering Tomorrow | Danfoss
• UL Solutions
• Service and support - need help? | Danfoss

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