Manual 37143A
MFR 15 - Protection Relay & Control
Page 24/119
© Woodward
Control Inputs (
Option Y
)
Release
CB
Terminal 30/31
Energized.....
•
CB is open
- Enables operation of the power circuit breaker (voltage and
frequency control may also be enabled).
•
CB is closed
- No function.
De-energized
•
CB is open
- The control will act in the following manner dependent
upon the parameter "Aut.idle running control" in the section
titled "No Load Control". If this parameter is configured as:
"
OFF
":
Frequency and voltage are not controlled.
"
ON
":
Frequency and voltage are controlled if both
have surpassed the minimum permissible limits.
•
CB is closed
- The control will act in the following manner dependent
upon if the parameter "Stop sequence" (refer to page 59) is
enabled or disabled. If this parameter is configured as:
"
OFF
":
The active power controller and the power factor
controller are enabled. The load is not reduced
and the circuit breaker remains closed.
"
ON
":
The load is reduced according to
the ramp rated configured in pa-
rameter "Stop sequence ramp" and
the circuit breaker is opened when
the load level reaches 10% of the
configured load rating.
Reply: CB is open
Terminal 30/32
This DI is energized to signal the unit that the circuit breaker is open.
Isolated
operation
Terminal 73/74
Energized
.......
•
Enable voltage/frequency control when circuit breaker is
closed.
•
Dead bus closure enabled when circuit breaker is open.
De-energized
..
•
Disable voltage/frequency control when circuit breaker is
closed.
Control Inputs (
Option G
[
GU
/
GF
])
Release
controller
Terminal 30/31
Set.................
Release for operation of the controller.
•
CB is closed
- No function.
Reply ............
•
CB is open
- autom. no load control "
OFF
": All functions from
- autom. no load control "
ON
": Possibly voltage and/or fre-
quency control.
Reply: CB is open
Terminal 30/32
This input (logical "1") is used to signal the unit that the power circuit
breaker is open.
Set point raise
Terminal 73/74
By application of a pulse, the selected set point is increased.
Set point lower
Terminal 73/75
By application of a pulse, the selected set point is decreased.