Trip generator breaker + AVR + shutdown engine
Controller types GENSET and EMERGENCY genset controllers
Priority Highest
Effect
The controller trips the genset breaker (that is, without de-loading) and the AVR (that is, stops
reactive power regulation). The controller shuts down the engine, without a cooldown period.
Priority of alarm action
It is possible for two or more alarm actions to be active for the same equipment at the same time. In these cases, the controller
performs the alarm Action with the highest priority. A later alarm Action with a lower priority does not change the controller's
execution of the earlier alarm Action with the higher priority. Similarly, if a more severe alarm Action is activated after a less severe
alarm Action, the controller performs the more severe alarm Action.
Alarm action priority example
One alarm activates Trip generator breaker and stop engine, and at the same time another alarm activates Trip generator
breaker and shutdown engine. Trip generator breaker and stop engine includes a cooldown period, while Trip generator
breaker and shutdown engine does not. The controller shuts down the engine without cooling, regardless of the order of
the alarms.
4.2.5 Delay
When the alarm Set point is exceeded and a Delay is configured for the alarm, the controller starts the timer for the alarm. If the
operational value stops exceeding the Set point, the timer is stopped and reset. If the value exceeds the alarm Set point for the
whole of the Delay, the controller activates the alarm.
The following graphs show how the Delay works.
Figure 4.3
Delay for a high alarm based on an analogue operating value
t
delay
0
Set
point
Value
time
t
delay
Figure 4.4 Delay for a high alarm based on a digital input
t
1
LOW
HIGH
Digital
input
Time
t
2
DESIGNER'S HANDBOOK 4189340911K UK Page 99 of 521
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