Unigen Plus & Industrial Unigen - User technical documentation
-D page 7/19
‘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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