Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 32/165
© Woodward
Dead Bus Start
Dead bus start:
Output of a connect command for the circuit breaker without synchronization.
Input signals [terminal]
Function
Conditions
Reply:
GCB is open [
4]
En
ab
le GCB [3
]
Reply :
M
CB is open [
54]
Enable MCB [53]
1
1
1
0
Dead bus start GCB
E
1
x
1
1
Dead bus start MCB
F
0: "OFF" / 1: "ON" / x: signal has no significance (0 or 1)
Table 4-3: Operating conditions - dead bus start
The busbar must be de-energized.
Condition Function
E
The parameter "Dead bus start generator breaker" is ON and the generator voltage and fre-
quency are within the configured limits.
F
The parameter "Dead bus start mains breaker" is ON and is valid for the mains values:
- 50 % V
set
< voltage < 125 % V
set
- 42 Hz < frequency < 110 % f
rated
Table 4-4: Operating conditions - dead bus start - conditions
Isolated Operation
Isolated operation:
Generator voltage and frequency are adjusted to the configured set point values by raising
and lowering the controller outputs for voltage and speed/frequency as required.
Input signals [terminal]
Function
Conditions
Isolated oper
ation
contr
oller
ON [
35]
Reply:
GCB is open [
4]
En
ab
le GCB [3
]
Reply :
M
CB is open [
54]
Enable MCB [53]
0
0
x
1
0
no control of f/V
---
1 0 x 1 0
Isolated
operation
---
0: "OFF" / 1: "ON" / x: signal has no significance (0 or 1)
Table 4-5: Operating conditions - isolated operation
An isolated operation only takes place if the generator frequency is greater than 42 Hz. Voltage control only
takes place if the generator voltage is at least 80 % of the secondary transformer rated voltage and the parameter
"Voltage controller isolated operation" is enabled. Voltage, frequency, and synchronization control may be
enabled or disable in the configuration menu.
NOTE
When using three-position controllers, these must be configured using the relay manager (see appen-
dix "Relay Manager").