6.15.2 Breaker position failure
At all times, the controller must get feedback from the breaker about its position, that is, whether it is opened or closed.
The position failure alarm is activated:
• When the controller is not getting either an open or close feedback from the breaker.
• When the controller is getting both open and close feedbacks from the breaker simultaneously.
Controller Breaker Parameters
Genset Generator Breaker GB Pos fail (menu 2180)
Genset Mains Breaker MB Pos fail (menu 2220)
Mains Tie Breaker TB Position fail (menu 2180)
Mains Mains Breaker MB Pos fail (menu 2220)
BTB Bus Tie Breaker BTB Position fail (menu 2180)
When a controller has position failure alarm on its breaker, in the application supervision the position failure is highlighted as shown
below.
INFO
By default, the fail class of the position failure alarm is Warning. This allows the breaker to retry the action that it was doing
before the alarm was activated.
6.15.3 Breaker spring load time
To avoid breaker close failures in situations where breaker ON command is given before the breaker spring has been loaded, the
spring load time can be adjusted for GB/TB and MB.
The following describes a situation where you risk getting a close failure:
1. The genset is in auto mode, the auto start/stop input is active, the genset is running and the GB is closed.
2. The auto start/stop input is deactivated, the stop sequence is executed and the GB is opened.
3. If the auto start/stop input is activated again before the stop sequence is finished, the GB will give a GB close failure as the GB
needs time to load the spring before it is ready to close.
Different breaker types are used, and therefore there are two available solutions:
1. Timer-controlled: A load time set point for the GB/TB and MB control for breakers with no feedback indicating that the spring is
loaded. After the breaker has been opened it will not be allowed to close again before the delay has expired. The set points are
DESIGNER'S HANDBOOK 4189341275A EN Page 131 of 196
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