Trip generator b 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
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