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Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 90/165
© Woodward
Parameter
Parameter
95
Add-off ramp
max.time 000s
Add-on/add-off ramp
0 to 999 s
This time can be used to influence two functions:
Add-off:
The maximum amount of time the generator has to shed load below 3%
of the generator load rating (Parameter 28) is configured here. If the generator has
not dropped below 3% of the generator load rating within this time period, the
GCB is opened.
Add-on with soft loading:
If the mains interchange (import/export) real power
value does not reach 0kW in breaker logic "INTERCHANGE" within the time con-
figured here, a class F1 alarm and an alarm message are issued. In addition, the re-
lay manager relay programmed with relay manager function 93 (Appendix E) is
enabled and the MCB is prevented from opening.
Parameter
96
GCB open at F2
max.time 000s
Max. permissible time with F2 prior to open the GCB
0 to 999 s
Prerequisite: Load sharing and automatic start/stop are configured "ON". The gene-
rator is in isolated operation and at least one additional generator is connected to
the busbar.
If a class F2 alarm occurs, shutting the generator down is delayed by the time con-
figured here. This gives another generator the opportunity to start and assume the
load. The generator is shut down when this time expires.
Parameter
97
Signal logic GCB
----------------
GCB: signal logic
Continuous/Impulse
Continuous
.. The "Command: close GCB" relay can be looped directly into the
self-holding circuit of the power circuit breaker. After the connect
pulse has been issued and the reply from the GCB has been received,
the "Command: close GCB" relay remains energized. If the power
circuit breaker has to be opened, the relay de-energizes.
Impulse
........ The "Command: close GCB" relay issues a connect pulse. An exter-
nal holding circuit must performs the GCB self-holding functions of
the GCB. The reply of the GCB is used to detect the closed contacts.
In both cases, the "Command: open GCB" relay energizes to open the breaker.
Parameter
98
Opening GCB
----------------
GCB: open (terminal 41/42)
NO-cont./NC-cont.
NO-cont.
...... If the GCB is to be opened, the "Command: open GCB" relay (ter-
minal 41/42) is energized. Following "Reply: GCB is open" the relay
is de-energized again.
NC-cont.
....... If the GCB is to be opened, the "Command: open GCB" relay (ter-
minal 41/42) is de-energized. Following "Reply: GCB is open" the
relay is energized again.