Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 94/165
© Woodward
Breaker Monitoring
Parameter
113
Supervision GCB
ON
Breaker monitoring GCB
ON/OFF
ON
................ Monitoring of the GCB is performed (except in the "EXTERNAL"
CB logic). If the circuit breaker cannot be closed by the fifth attempt,
the relay manager function 89 relay is energized and a class F1 alarm
and message are issued. The control unit continues to attempt to
close the GCB. If, 2 seconds following a "Command: open GCB"
pulse, the "Reply: GCB is open" is detected, the relay manager func-
tion 91 relay is energized and an alarm message is displayed. If the
generator is load sharing, the add-on command is deleted so that
another control can close the breaker.
Tripping of class F1 alarm
OFF
.............. Monitoring is not performed.
Parameter
114
Supervision MCB
ON
Breaker monitoring MCB
ON/OFF
ON
................ Monitoring of the MCB is performed (except in the "EXTERNAL"
CB logic). If the circuit breaker cannot be closed by the fifth attempt,
the relay manager function 90 relay is energized and a class F1 alarm
and message are issued. The control unit continues to attempt to
close the MCB. If, 2 seconds following a "Command: open MCB"
pulse, the "Reply: MCB is open" is detected, the relay manager func-
tion 92 relay is energized and an alarm message is displayed. If the
generator is load sharing, the add-on command is deleted so that
another control can close the breaker.
Tripping of class F1 alarm
OFF
.............. Monitoring is not performed.
Mains Decoupling
If the application the control unit is being configured for is an isolated system, this configuration screen and its
settings do not apply. If the application is a single-breaker unit in a mains parallel operation, the GCB is confi-
gured as always open.
NOTE
The "Blocking of mains protection" input (terminal 61) disables mains monitoring and decoupling.
Parameter
115
Mains decoupling
via ---
Mains decoupling through ...
MCB/GCB
The fault condition decoupling logic for the control unit is configured here. If the
generator is used in a parallel isolated application, the MCB must be configured
here. If the generator is to be used in a mains parallel application, the GCB must be
configured to decouple.
Mains Settling Time
Parameter
116
Mains settling
time 000s
Mains settling time
0 to 999 s
It is possible for to delay the synchronization of the generator to the mains for the
period of time configured here. This will permit the user to ensure that the mains
voltage is stable while the generator continues to operate in an isolated (parallel)
mode or idle offline.
