Manual 37143A
MFR 15 - Protection Relay & Control
Page 26/119
© Woodward
Functional Table
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Option Y
Input signal
Function
Operation
Discrete input:
"Isolated
operation"
Discrete input:
"Reply:
CB is open"
Discrete input:
"Enable CB"
energized de-energized
No-load operation generator
A
energized energized energized
Dead bus start power circuit breaker
B
de-energized
energized energized
Synchronization power circuit breaker
C
energized de-energized
Isolated operation
D
de-energized de-energized
Power control (
Option B
) E
de-energized de-energized
Power-factor control (
Option C
) E
Option G
[
GU
/
GF
]
Input signal
Function
Operation
Discrete input:
"Enable controller"
Discrete input:
"Reply:
CB is open"
de-energized
All controller functions OFF
energized de-energized
Options B
+
G
/
GF
: Active-power control
Options C
+
G
/
GU
: power-factor control
energized energized
Option G
/
GU
: Voltage control
Option G
/
GF
: Frequency control
Table 4-1: Operating modes - functional table
The control functionality is affected by the available discrete input signals. The user must ensure that the "Re-
ply: CB is open" signal is energized only when the circuit breaker is open. The auxiliary contact of the circuit
breaker must be a break contact. Table 4-1:Operating Modes illustrates the terminals that must be energized (24
Vdc) to enable specific control functionality. If the input terminal has the "
" symbol in the provided space, the
energizing (24 Vdc) or de-energizing (0 Vdc) the specific input will not affect the functionality of the control.
Conditions
The device functionality is dependent upon the measured voltages in addition to the state of the discrete inputs. If
specific functionality of the control is desired, the related parameters must be enabled to permit the desired func-
tionality regardless if the discrete inputs are energized or not.
Condition
A
No-load operation
- Generator voltage must be greater than 50 % of V
N
- Power circuit breaker is open
- "Aut.idle running control" is configured as ON
B
Dead bus closure of circuit
breaker
- Synchronization voltage must be less than 5 % of parameter
"Volt.transformer sec. (MN)"
- Generator voltage within the permissible limits
C
Synchronization
Power circuit breaker
- Synchronization voltage within the permissible limits
- Generator voltage within the permissible limits
D
Isolated operation
- Power circuit breaker must be closed
E
Power control (
Option B
)
Power factor control (
Option C
)
- If "Stop sequence" is configured as OFF,
- The CB must be closed / Reply: CB is open is de-
energized
- The discrete input "Release CB" must be de-energized
Table 4-2: Operating mode conditions