AGC Designer’s Reference Handbook
DEIF A/S Page 141 of 168
Gen-set start actions
The start sequence of the AGC is changed in order to achieve the function ‘close before
excitation’. The following parameters must be adjusted:
Menu Description Comment
2111 RPM setpoint for
breaker closing
The generator breaker will close at the adjusted level. The range is
from 0-400 RPM. If it is adjusted to 0, then the breaker will be
closed when the start command is given.
In the example below the setting is adjusted to 400.
2112 RPM timer The gen-set must reach the setpoint (menu 2123) within the
adjusted delay.
When the delay expires and the RPM is above the setpoint, then the
excitation will be started. If the RPM is below the setpoint, then the
GB will be tripped.
2113 Output A Select the relay output that must be used to start the excitation.
Configure the relay to be a limit relay in the I/O setup.
2114 Output B Select the relay output that must be used to start the excitation.
Select the same relay as in the menu 2113.
2115 Enable Enable the function ‘close before excitation’.
The diagram above shows that the GB will be closed at 400 RPM. When the engine RPM has
reached the setpoint (menu 2123) (1450 RPM), then the excitation is switched on.
Breaker sequence
The ‘GB close before start’ function can be used in three applications:
1. AGC single gen-set plant.
2. AGC power management plant - no tie breaker present.
3. AGC power management plant - tie breaker present.
In one of the applications a tie breaker is present, and it must be adjusted in the menu 2121
whether only the generator breaker must be closed or both the generator breaker and also the
tie breaker.
1500 RPM
1350 RPM
400 RPM
Engine RPM
time
Close GB Start
excitation
RPM
NOM
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