Deif Multi-line 2 Designers Reference Handbook page 141

AGC
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
2111 RPM setpoint for
breaker closing
2112 RPM timer
2113 Output A
2114 Output B
2115 Enable
1500 RPM
1350 RPM
400 RPM
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.
DEIF A/S
Comment
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.
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.
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.
Select the relay output that must be used to start the excitation.
Select the same relay as in the menu 2113.
Enable the function 'close before excitation'.
Engine RPM
Close GB
Designer's Reference Handbook
time
Start RPM
NOM
excitation
Page 141 of 168