Manual 37128A GCP-20 Series - Genset Control
© Woodward Page 35/190
Control Outputs
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Ready for operation
Terminal 18/19
Setting the relay signals the readiness for operation of the unit. If this relay drops off, a fault-
less operation of the unit cannot be guaranteed. Make sure to take the appropriate measures if
this relay has dropped out (e.g. open GCB, switch off the engine).
Preheating (diesel unit)
pre-assigned to relay 3
terminals 37/38
By setting this relay, the diesel unit is preheated (see description of functions starting process
diesel unit, page
142).
Ignition "ON" (gas eng.)
pre-assigned to relay 3
terminals 37/38
By setting this relay, the ignition of the gas engine is switched on (see description of func-
tions starting process gas engine, page
139).
Starting relay (diesel unit)
Terminals 43/44
By setting this relay the start will be released for the drive unit. If the unit is to be shut down
the relay will immediately drop off. If the speed of the genset drops below the settable igni-
tion speed, the relay also drops out (see description of functions starting process diesel en-
gine, page
142).
Gas valve (gas engine)
Terminals 43/44
By setting this relay the gas valve for the gas unit will be opened. If the unit is to be shut
down the relay will immediately drop out. If the speed of the genset drops below the settable
ignition speed, the relay also drops out (see description of functions starting process gas en-
gine, page
139).
Starter
Terminals 45/46
By setting this relay the starter will be engaged. When reaching the ignition speed or in case
of a STOP the starter is reset.
Centralized alarm
pre-assigned to relay 14
terminals 47/48
By setting this relay, a centralized alarm is output. It is possible to trigger for instance a horn
or a buzzer. The operator can reset the relay by pressing the pushbutton "clear" for a short pe-
riod. The relay will be set again if another alarm occurs. The centralized alarm is set for
alarms of the alarm class F1 to F3.
Command: GCB close
Terminals 14/15
By setting this relay the generator power circuit breaker (GCB) will be closed. If the connec-
tion of the GCB has been parameterized to continuous pulse, the "Reply: GCB is open" the
relay is maintained in its closed state; this is also the case if the voltages of the generator and
the generator busbar are identical. In the event of an alarm of the class 2 or 3, or the GCB is
to be opened, this relay drops out. If the connection of the GCB was not programmed by
means of a continuous pulse the relay drops out again after the pulse is issued.
Command: GCB open
Terminals 41/42
By setting this relay the GCB will be opened. Following "Reply: GCB is open", the relay
output is removed.
[GCP-20/22]
Command: MCB close
Terminals 16/17
By setting this relay the MCB will be closed. This output is always a add-on pulse, i. e, the
locking of the mains circuit breaker must be carried out externally.
[GCP-20/22]
Command: MCB open
Terminals 39/40
By setting this relay the MCB will be opened. Following "Reply: MCB is open", the relay
output is removed.
Addtl. relays R1 to R4
Terminals 74 to 83,
33 to 38, 47/48
These relays are managed by the "relay manager" (see
Relay Manager on page 158).
Presetting:
• Number of relay (e. g. relay 1 = alarm class 1, relay 2 = error class 2, etc.)
• Relay 3 = ignition / preheating
• Relay 4 = Centralized alarm
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