CRE Technology UNIGEN Plus Guide

Unigen Plus & Industrial Unigen - User technical documentation
A51Z090004
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November 2006
Synchronization and load sharing module
Technical documentation
CRE technology believes that all information provided herein is correct and reliable and reserves the right to update at
any time. CRE Technology does not assume any responsibility for its use unless otherwise expressly undertaken.
A51Z090004-D.doc
CRE technology
Allée Charles-Victor Naudin - Zone des Templiers - Sophia Antipolis
06410 BIOT - FRANCE
Téléphone : + 33 (0)4.92.38.86.82 - Fax : + 33 (0)4.92.38.86.83
Internet: http://www.cretechnology.com

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History:
•Version A: May 2005 : initial document
•Version B: September 2005 : modification of the picture of the cover (P4).
•Version C: October 2006 : adaptation of the document for new hardware of the Unigen for Unigen Plus
A51M109 and Industrial Unigen.
•Version D: November 2006 : addition of the Modbus, Command mode and Mains paralleled functions.
Documentation List:
•A51Z090004 : technical documentation for Unigen Plus and Industrial Unigen.
•A51Z190104 : Application note : GCR/Unigen plus, wiring mains synchronisation.
•A51Z090100 : Application note : Generating set auto synchroniser and load sharer.
•A51Z190101 : Application note : Load shedding.
•A51Z190102 : Application note : Paralleling lines wiring for Carantec/Unigen Plus.
•A51Z190103 : Application note : Replacement of a powercon ‘DYN2-94026’ by a Unigen Plus.
•A51Z180006 : Application note : Procedure to download the complete firmware of a Unigen Plus.
•A51Z290001 : Application note : Mobil group
•A51Z090202 : Application pictures.
•A51Z090030 : Complete variable list with label, units and limits
A51Z1 ‘Unigen plus’
A51Z0 ‘MPS5.0’
A51Z2 ‘Industrial Unigen’
NOTE :
Read this entire manual and all other publications pertaining to the work to be performed before
installing, operating, or servicing this equipment. Practice all plant and safety instructions and
precautions. Failure to follow instructions can cause personal injury and/or property damage.
Contact your CRE dealer for course training.

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Contents
History:....................................................................................................................................................................................2
Documentation List:................................................................................................................................................................2
1. Overview ..........................................................................................................................................................................4
1.1. Cover of the Unigen .................................................................................................................................................4
1.2. Global function.........................................................................................................................................................4
2. Features...........................................................................................................................................................................5
2.1. Synch check relay.....................................................................................................................................................5
2.2. Reverse kW relay .....................................................................................................................................................5
2.3. Remote speed control input......................................................................................................................................5
2.4. Isochronous load sharing (for Unigen plus) with PARALLELING LINES.............................................................6
2.5. CAN load sharing.....................................................................................................................................................6
2.5.1. Plug and play....................................................................................................................................................6
2.5.2. Automatic load/unload request.........................................................................................................................6
2.6. Load sharing.............................................................................................................................................................7
2.6.1. Ramps...............................................................................................................................................................7
2.6.2. Automatic trip.out.............................................................................................................................................7
2.6.3. Manual load/unload request.............................................................................................................................7
2.7. DROOP load sharing................................................................................................................................................8
2.8. COMMAND MODE (for Unigen Plus)...................................................................................................................8
2.9. MAINS PARALLELED (for Unigen Plus)..............................................................................................................8
2.10. Modbus(for Unigen Plus) .......................................................................................................................................10
3. Settings...........................................................................................................................................................................11
4. Display ...........................................................................................................................................................................12
5. Terminals.......................................................................................................................................................................13
5.1. Terminals description.............................................................................................................................................13
5.2. Wiring diagram.......................................................................................................................................................15
5.3. Connection specifications.......................................................................................................................................15
6. Commissioning..............................................................................................................................................................16
6.1. Caution...................................................................................................................................................................16
6.1.1. Grounding:.....................................................................................................................................................16
6.1.2. Wiring rules:...................................................................................................................................................16
6.1.3. Vibrations:......................................................................................................................................................16
6.2. Power plant start-up/Commissionning ...................................................................................................................17
7. Environment..................................................................................................................................................................19
8. Dimensions....................................................................................................................................................................19

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1. Overview
1.1. Cover of the Unigen
Each terminals of the industrial Unigen are on the Unigen Plus.
Only for Unigen Plus.
1.2. Global function
•Automatic and Manual synchronization (‘sw5’ and ‘sw6’ configuration).
•Active load sharing in isochronous, droop mode or Command mode (for Unigen Plus).
•Reactive load sharing in isochronous voltage, droop mode or power factor fixed (for unigen Plus).
•Compatibility with all speed governors (‘sw2’ configuration) and AVR on the market.
•Remote speed control by potentiometer.
•Internal synch check relays, useful for auto and manual synchronization.
•Phase sequence protection.
•Load sharing with CAN plug and play (‘sw1’ configuration) or with paralleling lines(for Unigen Plus: ‘sw3’
configuration).
•Automatic load/unload.
•Reverse Kw relays.
•2 analogue outputs (0-5V or 0-20mA/4-20mA) for Kw meter (‘sw4’ configuration).
•MODBUS RTU on serial port RS485 (for Unigen Plus) (‘sw8’ configuration).
•Command mode (for Unigen Plus).
•Mains Paralleled (for unigen Plus).
•For switches configuration see chapter 3 ‘Settings’.

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2. Features
2.1. Synch check relay
SYNC OK output (terminal 34/35) permit the coupling of generators when all following conditions are correct:
•Voltage of generator and bus bar within a 15 - 130% window from nominal voltage (500V).
•Voltage difference between generator and bus bar, < 10%
•Frequency of generator and bus bar within a 30 - 130% window from nominal frequency
•Phase Angle difference between generator and bus bar. <+/- 10°
•Frequency difference between generator and bus bar, < 0,01Hz
•Phase sequence correct.
The ‘SYNC OK’ output is depending of ‘SYNC IN’ (terminal 3), ‘sw5’, ‘sw6’, correct conditions and deadbus.
‘sw5’ is to authorize or not the coupling when the ‘SYNC IN’ is not connected.
‘sw6' is to authorize or not the coupling when the generator is on deadbus bar.
Behaviour of ‘SYNC OK’ is described in the following table:
Terminal 5
‘Breaker in’ Terminal 3 ‘sync in’ sw6 deadbus
sw5
synchronization
Deadbus
(no voltage
on the bus)
∆φ∆Hz∆V phase
sequence Terminals 34/35 ‘sync ok’
OFF X X nok open
X X no ok close
ON X yes nok close
close
ON X no nok open
X OFF X X open
OFF ON X nok open
X ON no ok close
ON ON yes nok close
open
open
ON ON no nok open
Close: connected to the 0VDC.
Open: not connected.
X: no matter.
The relay is closed when the conditions are correct.
At start, on deadbus, there is a delay before closing the ‘SYNC OK’ relay (E01033, default value 3.0s).
The ‘SYNC OK’ green LED confirms the activation of the relay:
•LED ON = contact closed
•LED OFF = contact open
2.2. Reverse kW relay
UNIGEN includes a reverse Kw relays, terminal 9 & 10.
This relay output closes when the Kw of the generator is below -5% of the nominal Kw during more than 20 seconds.
The ‘REV. kW’ red LED confirms the activation of the relay:
•LED ON = contact closed
•LED OFF = contact open
2.3. Remote speed control input
•UNIGEN includes a remote speed control input on terminals 14, 15 and 16.
Those 3 wires inputs (+5v, cursor, -5v) are design to accept 5 kOhms external potentiometers.
The mid point of those potentiometers (5 turns for a 10 turns potentiometer) will generate a 0V signal to the cursor
input and will not generate any speed deviation.
The maximum speed deviation is + / - 3,00Hz:
•+5V applied on cursor input will increase the speed of + 3,00Hz
•-5Vapplied on cursor input will decrease the speed of -3,00Hz
This input can also be used as 0-5Vdc for a master PLC control. In this case the nominal speed have to be adjusted
with 2.5 VDC applied on cursor input.
One generator has to be started alone to close on the dead bus before starting the other
generators.

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2.4. Isochronous load sharing (for Unigen plus ) with PARALLELING
LINES
When ‘DROOP’ (terminal 4) input is opened and the switch ‘sw3’ (plines/canbus) is on plines (OFF position), UNIGEN
is in isochronous load sharing mode, it compares the power with the level of paralleling lines and it generates an
output signal to the speed governor to adjust its percentage power with the level of the paralleling lines.
Voltage on parallel lines
(terminals 44 and 45)
KW%
0V
3V
100%
0%
2.5. CAN load sharing.
When ‘DROOP’ (terminal 4) input is opened and the switch ‘sw3’ (plines/canbus) is on canbus (ON position) (for
Unigen Plus), UNIGEN is in isochronous load sharing mode. The load setpoint will be calculated via the CAN
connection.
Until 8 UNIGEN can be connected via CAN bus.
The canbus needs a terminal resistor so, put the ‘sw1’ (canbus OFF/120Ω) in ON position for the first and the last
Unigen, for the others Unigen put the switch ‘sw1’ in OFF position.
2.5.1. Plug and play
As soon as several UNIGEN are connected together, they choose automatically a generator number different from
each other.
They are able to share the load without any settings.
If one UNIGEN disappear from the CAN, it is no longer taken under account by the others, and they continue to share
the load isochronously.
2.5.2. Automatic load/unload request
The ‘START ON LOAD REQUEST’ relay output can be used to start and stop the slave generators depending on the
load request.
The ‘START ON LOAD REQUEST’ green LED confirms the activation of the relay:
•LED ON = contact closed
•LED OFF = contact open
A generator is slave when the ‘SLAVE INPUT’ input is connected to 0V.
•If the power plant load goes below 20% of the nominal power during more than 2 minutes, stop negotiations
begin to elect one of the slave generators to stop.
•If the power plant load goes above 70% of the nominal power of the power plant during 10 seconds, start
negotiations begin to elect one of the slave generators to start.
•If the load is between 20% and 70% of the nominal power than the actual number of generators on the bus
bars will not change until 20% or 70% threshold is reached.
‘SET UNAVAILABLE’ input:
•If Unigen is stopped and its ‘SET UNAVAILABLE’ input is activated it will inhibit the start (‘START ON LOAD
REQUEST’ relay kept open and ‘TRIP OUT’ relay closed) in case of the load request.
Load shedding inhibition:
•Don’t connect the ‘START ON LOAD REQUEST’ relay: the load shedding will not have any influences.
•In droop mode the load shedding is inhibited.
• CAUTION:
If Unigen is running and on the bus bar as soon as ‘SET
UNAVAILABLE’ is closed the ‘TRIP OUT’ relay is activated (closed) to
open the breaker of the generator.

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‘START ON LOAD REQUEST’ relay behaviour is described in the schematic below.
Note: At start up, ‘START ON LOAD REQUEST’ relay is closed. All generators are started because it is impossible to
know the level of load before start.
2.6. Load sharing
2.6.1. Ramps
Ramp sequences:
•The first generator on the bus bars takes immediately the load with no ramp.
•The other generator load ramp stops when generators reach the load setpoint (average power plant load).
•The unload ramp stops when the power reach 5% of its nominal power.
•Load and Unload ramp rates are using the same potentiometer.
The single turn potentiometer named ‘RAMP TIME’ adjusts the ramp time from 0 seconds to 180 seconds. This setting
is the time to transfer 100% of the nominal power.
2.6.2. Automatic trip.out
‘TRIP OUT’ (terminal 7 & 8) relay is used to open the breaker once the unload ramp is finished.
The relay is closed when the kW of the generator which is unloading reach 5% of the nominal kW.
The ‘TRIP OUT’ green LED confirms the activation of the relay:
LED ON = contact close.
LED OFF = contact open.
2.6.3. Manual load/unload request
The Load /Unload ramps are managed by the ‘UNLOAD’ input (terminal 6):
•‘UNLOAD’ (terminal 6) input disconnected = when the breaker closes, the load ramp starts immediately.
•‘UNLOAD’ (terminal 6) input connected to 0v = the generator starts an unload ramp.
100%
0%
Ramp Time
60sec.
Kw
Load Time
Power plant power
60%
36sec.
⇒
Power plant
load
Slave generator
load
Load threshold
Unload threshold
Low limit
BREAKER IN
TRIP OUT
START ON LOAD REQUEST
Unload
delay
Start on load request
delay
Ramp
Load
delay
Ramp
Unload
request
Load
request

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2.7. DROOP load sharing
When ‘DROOP’ (terminal 4) input is connected to 0 VDC, UNIGEN is in Super droop mode.
In this mode the load sharing is managed between 50.50Hz (0% load) and 50.00Hz (100% load).
For this specific droop, it is not needed to set precisely the engine speed, and any connections are required between
each UNIGEN, even the 0V.
kW and kVAR load sharing are managed with droop.
Freq
KW%
50.00Hz
50.50Hz
100%
0%
2.8. COMMAND MODE (for Unigen Plus )
When 1->’DROOP’ input is opened (terminal 4 not connected),
2->‘COMMAND MODE’ input is closed (terminal 39 connected to the 0VDC),
3->and the generator breaker is closed (terminal 5 connected to the 0VDC),
then the UNIGEN Plus is in ‘Command mode’.
The setpoint load is fixed via the remote potentiometer of kW set point (terminals 40/41/42) and the power factor is
fixed at 0.95 by the parameter ‘E11020’.
The low limit of the potentiometer is 5% and the high limit is 110% of nominal kW.
Behaviour of kW setpoint (potentiometer) is described on schematic below.
Voltage on
potentiometer
kW setpoint
KW%
CCW: 0V
or setpoint not
connected
CW: 5V
110%
5%
‘Command mode’ behaviour is described in the second schematic shown on chapter ‘MAINS PARALLELED’.
2.9. MAINS PARALLELED (for Unigen Plus )
When 1->‘DROOP’ input is opened (terminal 4 not connected),
2->‘COMMAND MODE’ input is opened (terminal 39 not connected),
3->‘MAINS PARALLELED’ input is closed (terminal 38 connected to the 0VDC),
4->and the generator breaker is closed (terminal 5 connected to the 0VDC),
then the UNIGEN Plus is in ‘Mains paralleled’ mode.
The setpoint load is fixed by the paralleling lines (terminals 44/45) (coming from the GCR for example) and the power
factor is fixed at 0.95 by the parameter ‘E11020’.
A 0V in paralleled lines (terminals 44/45) is that the generator takes 0% of load, a 3V in paralleled lines is that the
generator takes 100% of load.
Behaviour of kW setpoint (paralleling lines) is described on schematic below.
Voltage on paralleled lines
(terminals 44 and 45)
KW%
0V
3V
100%
0%

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‘Command mode’ and ‘Mains paralleled’ active power behaviour is described in the schematic below.
Mains load
Generator load
Load
impact
Low limit
Unload
request
Paralleling of
the generator
Load setpoint::
Command mode load=kW sepoint input,
Mains paralleld load=paralleling lines input.
Low
limit
stop generator
Active power set point behaviour in different mode is described in the following table.
Terminal 6
'unload' Terminal 5 'breaker in' Terminal 4 'droop'
Terminal 38
'mains
paralleled'
Terminal 39
'command
mode'
sw3
'plines/
canbus'
Mode kW management
X open X X X X waiting not
open close close X X X droop frequency
open close open open open OFF load sharing paralleling lines(B44-45)
open close open open open ON load sharing canbus(B46-47)
open close open X close X command mode kW setpoint(B41)
open close open close open X mains paralleled paralleling lines(B44-45)
close close open X X X unload ramp time potentiometer(RV3)
Close: connected to the 0VDC.
Open: not connected.

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2.10. Modbus(for Unigen Plus )
Put the ‘sw8’ (Modbus OFF/120Ω) on ON position (resistor of 120Ω) when the Unigen Plus is used on end of line.
All the logical and analogue input/output values and all the other parameters which appear in the UNIGEN Plus menus
can be obtained by the serial port RS485 terminals 49A and 50B (2 wires). The Unigen Plus is used as a slave.
Support of MODBUS RTU by the UNIGEN Plus is performed in the following parameters:
•Communication speed: 4800, 9600 and 19200 (default: 19200).
•Number of bits by character: 8
•Number of parity bits: 0
•Number of stop bits: 1
•RTU address: 1 to 569B.
•Supported function: 04 (analogue reading) and 03 (registers reading).
•The RTU address of the variables is the same than their number plus 1, converted in hexadecimal.
For example variable E00110 (Mains break input), its RTU address is 006Fh (111). See the
A51Z090030.xls file to know the variable number.
Reading example: Slave N°1, addresses from 001h to 003h included (3 registers)
Request:
Fields Value (hex)
Slave address 01
Function 04
MSB start address 00
LSB start address 01
MSB number of registers 00
LSB number of registers 03
CRC16 --
Response:
Fields Value (hex)
Slave address 01
Function 04
Number of bytes 06 (3 registers * 2 bytes per register)
1st byte (MSB of 1st reg.) xx
2nd byte (LSB of 1st reg.) xx
3rd byte (MSB of 2nd reg.) xx
4th byte (LSB of 2nd reg.) xx
5th byte (MSB of 3rd reg.) xx
6th byte (LSB of 3rd reg.) xx
CRC16 --

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3. Settings
UNIGEN includes the following adjustments for calibration and settings:
Settings Picture Default value Description
SYNCHRO
Integral
SYNCHRO
Proportional
6h
6h
Single turn potentiometers: Integral adjustment of
synchronization. Single turn potentiometers:
Proportional gain adjustment of synchronization.
Synchronization adjustment:
•Turn P and I fully Counter Clockwise
•Turn P potentiometer till the generator is
unstable, Come back in CCW to stop the
instability.
I potentiometer is adjusted with the same
procedure.
RAMP TIME
0s Single turn potentiometer (0.0 - 180s).
This setting adjusts the time for LOAD and
UNLOAD ramps.
ADJUST
KW monitor
None
Multi turn potentiometer (0-100%).
Output span adjustment Kw (0-5V (terminals 11-
12) or 0-20mA/4-20mA (terminals 12-13)).
(‘sw4’ configuration).
OFFSET
Speed
control
output
None
Multi turn potentiometer (-10 to +10 VDC).
Adjustment of the Offset of the speed output. Used
to adjust the nominal frequency of the generator
(ex: 50,00Hz).
GAIN
Speed
control
output
6h
Single turn potentiometer (Span from 0 to 10VDC).
Span adjustment of the speed control output.
Used to adjust the maximum deviation asked by
UNIGEN =+/-3 Hz
OFFSET
Voltage
control
output
None
Multi turn potentiometer (-10 to +10 VDC).
Offset adjustment of the voltage control output.
Used to adjust the nominal voltage of the
alternator (ie. 400 VAC)
GAIN
Voltage
control
output
6h
Single-turn potentiometer (Span from 0 to
10VDC).
Span voltage control output. Used to adjust the
maximum deviation: = +/- 8% of the nominal
voltage.
NOMINAL
KW
None Have to be set during the commissioning. See
chapter 6.2.
Switch
Adjustment of
sw1 /sw2 /sw3
/sw4/sw5/sw6
/sw8 depend
of settings
Default:
sw2 ON,
Others
switch OFF.
Configuration of switches, 2 positions:
sw1’terminal resistor of Buscan’ : OFF position resistor not
connected; ON position resistor of 120Ωconnected.
sw2‘speed output option’ : OFF position reverse speed
regulation; ON position direct speed regulation for GAC speed
regulator.
sw3‘load sharing mode’ : OFF position paralleling lines load
sharing; On position canbus load sharing.
Not used switch for Industrial Unigen.
sw4‘Kw monitor output’ : OFF position output is 0-5VDC and
0-20mA; ON position output is 4-20mA.
sw5‘synchronization’ : OFF position the relay ‘SYNC OK’
(terminals 34/35) closes only when conditions are ok and
‘SYNC IN’ (terminal 3) is connected to the 0VDC; ON position
the relay ‘SYNC OK’ (terminals 34/35) closes when conditions
are ok.
sw6‘deadbus’ : OFF position the relay ‘SYNC OK’ (terminals
34/35) doesn’t close on deadbus condition; ON position the
relay ‘SYNC OK’ (terminals 34/35) closes on deadbus
condition.
sw7‘OFF/ON’ is not used.
sw8‘terminal resistor of Modbus’: OFF position resistor not
connected; ON position resistor of 120Ωconnected.
Not used switch for Industrial Unigen.

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4. Display
UNIGEN includes LED to have information feedback.
Led Description
POWER
SUPPLY
Green LED.
This LED is ON when DC power supply (12 or 24 VDC) is connected.
SYNC IN
This LED is ON when synchronization is required (input ‘SYNC IN’
closed to the 0Vdc) (‘sw5’ and ‘sw6’ configuration) .
DROOP
This LED is ON when a droop is required (input ‘DROOP’ closed to
the 0Vdc).
BREAKER IN
Green LED.
This LED is ON when the genset breaker is closed (input ‘BREAKER
IN’ closed to the 0Vdc).
TRIP OUT.
Green LED.
This LED is ON when the relay ‘TRIP OUT’ is closed.
REV KW
Red LED.
This LED is ON when the relay ‘REV Kw’ is closed.
START ON
LOAD
REQUEST
Green LED.
This LED is ON when the relay ‘START ON LOAD REQUEST’ is
closed.
SYNC OK
Green LED.
This LED is ON when the relay ‘SYNC OK’ is closed.
(‘sw5’ and ‘sw6’ configuration) .
MAINS
PARALLELED
Green LED.
This LED is ON when the mains breaker is closed (input ‘MAINS
PARALLELED’ closed to the 0Vdc)(for Unigen Plus).
COMMAND
MODE
Green LED.
This LED is ON when a command mode is required (input
‘COMMAND MODE’ closed to the 0Vdc) (for Unigen Plus).
CANBUS
Green LED.
This LED is flickering when the load sharing mode is the canbus.
This LED flickers according to the number of Unigen communicating
in the canbus (‘sw3’ to OFF configuration).

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5. Terminals
5.1. Terminals description
Terminal
n° Description Wire
Recommended
mm² /AWG Commentaries
1 POWER SUPPLY + 2.5 / 13
2 POWER SUPPLY - 2.5 / 13
DC Voltage from 9 to 40 VDC, 10 Watt.
Twist protection.
Note: Terminal 2 must be connected to both 0v of the
speed governors with a 4 mm² wire.
Fuse: 5 Amps / 40 VDC.
3 SYNC IN 1 / 17
Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input activates the automatic synchronization
(‘sw5’ and ‘sw6’ configuration) .
4 DROOP 1 / 17
Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input forces kW and kVAR load sharing in DROOP
mode.
5 BREAKER IN 1 / 17
Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input gives the position of generator breaker to the
UNIGEN.
Use a direct Aux contact of the breaker.
6 UNLOAD 1 / 17 Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input generate an unload ramp generator.
7 TRIP OUT 1 / 17
8 TRIP OUT 1 / 17
Dry contact: normally open. 250 VAC, 5A.
This output controls the opening of generator breaker
at the end of the unload ramp.
9 REV KW 1 / 17
10 REV KW 1 / 17 Dry contact: normally open. 250 VAC, 5A.
The relay is closed when generator is in reverse power.
11 KW monitor (0 – 5V) + 1.5 / 16
12 KW monitor (0V) 0.25 / 23
13 KW monitor (0 - 20mA) +
or (4 - 20mA) + 0.25 / 23
DC analogue output. 0 – 5V (Terminals 11 and 12),
0 – 20mAmps or 4-20mAmps (Terminals 12 and 13)
(‘sw4’ configuration).
This output (voltage and/or current) sends the actual
value of kW generator.
14 SPEED SET CW +5V 0.25 / 23 *
15 SPEED SET cursor 0.25 / 23 *
16 SPEED SET CCW -5V 0.25 / 23 *
Analogue input 5 kOhms potentiometer or -5/+5 VDC
between 2(-) and 15(+). Use a shielded wire.
This input allows a manual remote control of generator
speed.
17 Generator OUT speed control output 0.25 / 23 *
18 Generator REF from speed governor
speed control output 0.25 / 23 *
Analogue output +/-10 VDC. Use a shielded wire.
This output controls the speed of generator. Offset and
gain potentiometers, this output is compatible with all
speed governors of the market.
( ‘sw2‘configuration)
19 Shield 0.25 / 23 * Terminal to connect the shield of the analogue signals.
20 AVR OUT (+) 0.25 / 23 *
21 AVR OUT (-) 0.5 / 20 *
Isolated analogue output +/-10 VDC.
This output controls alternator voltage. Offset and gain
potentiometers, this output is compatible with all AVRs
of the market.
22 Generator I1+ 2.5 / 13
23 Generator I1- 2.5 / 13
24 Generator I2 + 2.5 / 13
25 Generator I2 - 2.5 / 13
26 Generator I3 + 2.5 / 13
27 Generator I3 - 2.5 / 13
AC current inputs from generator.
Current: from 0 to 5 A. Max current: 15 A during 10s.
Load: 1 VA.
The nominal current of the secondary of the current
transformers must be as close as possible to 5Amps.

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28 Generator L1 1.5 / 16
29 Generator L2 1.5 / 16
30 Generator L3 1.5 / 16
31 Generator Neutral 1.5 / 16
AC voltage input measurement generator.
Line to line voltage from 100 to 500 VAC.
Frequency: 50 or 60 Hz.
Fuses: 100 mA. / 600 VAC.
Note: If the neutral input is not connected, UNIGEN will
generate an internal virtual neutral point.
32 START ON LOAD REQUEST 1 / 17
33 START ON LOAD REQUEST 1.5 / 16
Dry contact: Normally open, 250 VAC, 5A.
‘START ON LOAD REQUEST’ relay is closed when the
load request exceeds 80% of the nominal power ->
slave generator is to start.
‘START ON LOAD REQUEST’ relay is opened when
the load request is above 20% of the nominal -> Slave
generator is to stop.
34 SYNC OK 1.5 / 16
35 SYNC OK 1.5 / 16
Dry contact: normally open, 250 VAC, 5A.
‘SYNC OK’ relay is closed when the coupling of the
generators is safe (‘sw5’ and ‘sw6’ configuration) :
- Voltage difference within limits.
- Phase difference within limits.
- Frequency difference within limits.
- Phase sequence
- or Deadbus
36 SET UNAVAILABLE 1 / 17 Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
Connect the signal "fault" from the generator.
37 SLAVE INPUT 1 / 17 Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
Select this UNIGEN in slave.
38 MAINS PARALLELED (for Unigen
Plus) 1 / 17
Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input gives the position of mains breaker to the
UNIGEN. Use a direct Aux contact of the breaker.
39 COMMAND MODE (for Unigen Plus)
1 / 17
Not isolated digital input, Dry contact to 0v
(10 kOhms pull-up).
This input forces kW and kVAR load sharing in
COMMAND MODE.
40 KW SET CW +5V (for Unigen Plus) 0.25 / 23 *
41 KW SET cursor (for Unigen Plus) 0.25 / 23 *
42 KW SET CCW 0V (for Unigen Plus) 0.25 / 23 *
Analog input 5 kOhms potentiometer or 0-5 VDC
between 42 (-) and 41 (+). Use a shielded wire.
43 Not connected
44 Parallel lines High(+)(for Unigen
Plus) 2.5 / 13*
45
Parallel lines low(-)(for Unigen Plus) 2.5 / 13*
0 to 3V. Isolated input.
Load sharing and power set level (kW only) (‘sw3’ to
OFF configuration).
Compatibility with other UNIGEN and with analogue
load sharing line isolated or not isolated (ex: GCR).
Compatibility with Wheaston bridge.
46 CANBUS+ 2.5 / 13*
47 CANBUS- 2.5 / 13* Isolated input. Load sharing with canbus
(‘sw3’ to ON
configuration for Unigen Plus) (‘sw1’ configuration).
48 SHIELD 0.25 / 23 * Terminal to connect the shield of the CAN signals.
49 MODBUS A (for Unigen Plus) 2.5 / 13 *
50 MODBUS B (for Unigen Plus) 2.5 / 13 *
19200 bps. Used to communicate with SCADA.
MODBUS RTU slave. Read (04 and 03) functions.
(‘sw8’ configuration).
51 Bus bar L1 1.5 / 16
52 Bus bar L2 1.5 / 16
53 Bus bar L3 1.5 / 16
54 Bus bar Neutral 1.5 / 16
AC voltage input measurement bus bar.
Line to line voltage from 100 to 500 VAC.
Frequency: 50 or 60 Hz.
Fuses: 100 mA. / 600 VAC.
Note: If the neutral input is not connected, UNIGEN will
generate an internal virtual neutral point.
Note: * Shielded cable is recommended for these connections. Use 2 or 3 Conductor Foil Shield with drain Wire.
Note: Cable sizes are for guidance only. Cable size should be increased for long cable runs, to overcome possible
voltage drop and to increase noise immunity.
Only for Unigen Plus.

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5.2. Wiring diagram
Each terminals of the industrial Unigen are on the Unigen Plus.
UNIGEN
plus
Speed
governor
-Alim
17
Speed out
23
Gen I1-
24
Gen I2+
25
Gen I2-
26
Gen I3+
27
Gen I3-
SynchOK
NO
16
Speed CCW -5V
15
Speed CW +5V
14
1
Powersupply+
2
powersupply-
18
Speed Ref
28
Gen L1
29
Gen L2
30
Gen L3
31
Gen N (optional)
22
Gen I1+
Chassis
isolatedfrom
powersupply
Fromspeed
governors
4mm²wire
19
3
breaker IN
4
5
Unload
Syncin
Trip out
NO
11
12
kW out +5V
kW out 0
Power monitor
0-5V or 0-20mA
6
Droop
Speed setpoint
Rev. kW
NO
13
kW out 20mA
-
Battery
+
5Amps
Load
Auto
Mains
Failure
L2
N
L3
L1
+/-5Vorpotentiometer
5kOhms
analog
F
100 - 480 V
Surge
diverter
P1
P2
S1
S2
P1
P2
S1
S2
P1
P2
S1
S2
5 A
-Alim
Breaker
control
34
35
9
10
8
7
G
F
F
F
+Alim
L2
N
L3
L1
100 - 480 V
51
Bus L1
52
Bus L2
53
Bus L3
54
(optional) Bus N
F F F
47
CAN-
CAN+
46
48
CRE
UNIGEN
AVR
20
AVR out +
21
AVR out -
Startonload
request
NO
32
33
36
Slaveinput
37
Setunavailable
45
44
CRE
UNIGEN
Barber Colman
PowRcon
Barber Colman
DYN2-80109
Woodward
2301A
...
Parallel lines high
Parallel lines low
41
40
42
Commandmode
38
CCW 0V
CW +5V
KW setpoint
+/-5Vorpotentiometer
5kOhms
39
Mainsparalleled
49
50
Modbus A
Modbus B
RS485
-Alim
Only for Unigen Plus.
5.3. Connection specifications
•Power supply: 9 to 40 VDC, <1A with 12 VDC and <500mA with 24 VDC.
•AC voltage inputs: 100 to 500 VAC, 100mA max. The neutral wire can be connected or not.
•AC currents inputs: 0 to 5A, 1VA. Each input is isolated from the other ones.
•Possible over-current: 15A during 10s.
•Frequency measurement: 45 to 70 Hz – 15 VAC minimum between neutral and line.
•Digital inputs: Normally Open, to be connected to 0v (internal pull up of 10 kOhms).
•Relay outputs: 5A, 230 VAC max.
•Remote speed control input: potentiometer (5 kOhms) or -5 +5VDC.
•Remote kW control input for ‘Command mode’: potentiometer (5 kOhms) or 0 +5VDC.
•Kw monitor output (0-5 V or 0-20ma/4-20mA): the maximum load impedance for the 0-20 mA. Or 4-
20mA. is 300 Ohms and the minimum load impedance for the 0-5 VDC is 1 K/Ohms.
•Speed bias output: The frequency control is made by the adjustable 0-10 VDC output. The
adjustments are, Offset and Gain potentiometers.
•Voltage bias output: The voltage control is done via the AVR. The output is a +/-10V, output with Gain
and Offset adjustments.
•Terminals: with screws, 2.5 mm
2
.

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6. Commissioning
6.1. Caution
6.1.1. Grounding:
The grounding of the chassis of UNIGEN must be done with the M5 screw. Use a 4mm² wire to connect to earth, this
cable should be as short as possible.
6.1.2. Wiring rules:
The cables with high voltage (400 VAC) and/or high current (5A) must be separated from the command cables. All the
command and digital inputs / outputs can be in the same cable path.
If you have to cross the command/DC cables with the 400V/5A cables, it is recommended to cross with a right angle.
The grounding must be done in a proper way to avoid personal injuries and for a reduction of EMC.
6.1.3. Vibrations:
In case of heavy vibrations, the UNIGEN should be mounted using AV Mounts.

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6.2. Power plant start-up/Commissionning
Caution: before starting the generating sets, please read the following part.
This is a standard commissioning for a simple power plant. If you use only this procedure, it can't engage our
responsibility.
Before commissioning (before going on site)
Check of schematics
How?
•Be sure you have the latest power plant schematics.
Why?
•To be sure the wires will be present on site (Can bus connector, shielded wires...).
What?
•0 Volt wiring.
•Shields.
•Speed governor / UNIGEN Interface.
•Automatic Voltage Regulator / UNIGEN Interface (droop current transformer must be removed).
•CAN Bus.
•Paralleled lines.
During commissioning
Start in safe condition
How?
•Generator breaker output locked in open position.
•Disconnect the wires between UNIGEN (terminals 17/18) and the speed governor.
•Disconnect the wires between UNIGEN (terminals 20/21) and the AVR.
•Ask the technician who had wired the power plant to lock the generator breaker open.
•Battery negative of each UNIGEN power supply (terminal 2) must be connected to each other Unigen
and to the 0V of the speed governor.
•Disconnect the wires of the relay ‘SYNC OK’ (terminals 34/35) of the Unigen.
Why?
•To be sure not to drive a false paralleling during the beginning of commissioning.
Switches configuration
How?
•Put switches in OFF/ON position before start the engine, see chapter 3 ‘Settings’ for more details.
Why?
•To configured several important functions of the Unigen.
Interface UNIGEN / Speed governor
Interface UNIGEN / Auto Voltage Regulator
How?
•Start the engine.
•Adjust the nominal speed and voltage, for example 50,00Hz & 400VAC, on the speed/voltage
regulator. If a trim pot is present on the AVR, adjust it to get +/-8% (see AVR manufacturer doc).
•Stop the engine.
•Remove the cover of the Unigen if necessary.
•Connect only the ref wire (terminal 18) to the speed governor “speed ref output”.
Speed setting :
•Start the engine.
•Adjust Speed gain RV10 full CCW on the UNIGEN.
•Measure the voltage between Ref and remote voltage input on speed regulator side.
•Adjust UNIGEN output voltage (terminals 17/18) adjusting the offset RV9 to have the same voltage
than measurement of previous point.
•Connect the control wire (terminal 17).
•Close the ‘SYNC IN’ input (terminal 3 to 0 Volts). UNIGEN is trying to synchronize on a dead bus
(00.00Hz).
•Adjust the speed gain RV10 to have 48,00Hz.
•Open the ‘SYNC IN’ input.

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Voltage setting :
•Adjust AVR Offset RV11 & Gain RV112 full CCW on the Unigen.
•Connect AVR outputs (terminals 20/21) to AVR.
•Adjust voltage offset RV11 to have 400VAC.
•Close ‘SYNC IN’ input (Terminal 3 to 0 volts).
•Adjust AVR Gain RV12 to reach 370VAC.
Check the control of the breaker on dead bus
•Be sure there is no critical load connected on bus bar.
•Close the breaker and verify that the breaker feedback (terminal 5) is closed (the ‘BREAKER IN’ led
should lit).
•Open the breaker and verify that the breaker feedback (terminal 5) is opened (led doesn’t lit).
Adjustment of the nominal power
For the Industrial Unigen :
•Set the kW monitor output in 0-5V: ‘sw4’ on OFF position.
•Put in full CW the multi turn potentiometer ‘adjust’ RV7.
•Close the circuit breaker of the generator. The ‘BREAKER IN’ led must light (terminal 5).
•Apply 100% of load on the generating set (with bench load for example).
•Adjust ‘NOMINAL kW’ potentiometer RV13 to reach 7.45VDC between terminals 11(+) and 12(-) of
the Unigen.
•Open the circuit breaker of the generator.
•Set the good configuration of ‘sw4’ as desired.
For the Unigen Plus:
•Put the ‘sw3’ on OFF position.
•Paralleling lines are not connected on terminals 44 and 45.
•Close the circuit breaker of the generator. The ‘BREAKER IN’ led must light (terminal 5).
•Apply 100% of load on the generating set (with bench load for example).
•Adjust ‘NOMINAL kW’ potentiometer RV13 to obtain 3V on parallel lines (terminal 44 & 45).
•Open the circuit breaker of the generator.
Check wiring of current
•Put load.
•Measure the voltage between terminals 11 and 12.
•Shunt the phase 1 current directly of the secondary of the current transformer (CT).
•Measure the voltage between terminals 11 and 12. Check that this voltage decrease of 1/3 that
before.
•Do the same test for phases 2 and 3 (don’t forget to remove the shunt of each phase after test).
•Set the good configuration of ‘sw3’ as desired.
Check synchronization
•Close the breaker to have voltage on the bus bar (mains or other generator).
•Lock the engine breaker in open position.
•Start the engine to check the synchronization.
•Close ‘SYNC IN’ input (terminal 3 to 0VDC).
•Adjust the P (RV15) & I (RV1) potentiometer of synchronization to have a response time of 4 or 5
seconds to get the ‘SYNC OK’ signal (terminals 34/35) the relay closes.
•With a voltmeter check on both sides of the breaker if the voltage is <20VAC on each phases.
•With the voltmeter check also that there is 400VAC between phase 1 of the engine and phase 2 of the
bus bar (crossed monitoring).
•In this test we don’t close the breaker.
•If the test is OK, connect the wires of the relay ‘SYNC OK’ (terminals 34/35) of the Unigen.
Load sharing / kW regulation
•Regarding the application check the stability of KW and kVAR regulation.
•Stop engines.

Unigen Plus & Industrial Unigen - User technical documentation
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7. Environment
•Operational temperature: -20 to + 85°C.
•Storage temperature: -30 to +85°C.
•Humidity: 5 to 95%. The PCB is tropicalized to be used in humid climate areas. Protection IP20.
•Altitude: 2000m.
•Size: 275x200x26mm.
•Mounting: Can be placed in all positions.
•Weight: 1.5Kg.
•Directive CE:
oGeneric emission standard: EN 50081-2, EN 50082-2.
oGeneric immunity standard: EN 61000-6-2.
oLow voltage directive: 73/23EEC.
8. Dimensions
10mm
275mm
165mm
25mm
200mm
25mm
nut 5 grounding
Holes
x4
D=5mm
115mm
255mm