Parameter
Range
Default
Comment
Tie breaker
sync. enabled
Not
enabled,
Enabled
Enabled
Not enabled
: The tie breaker and the generator breaker can never be closed at the same
time. The controller uses a short blackout to do a quick change from one supply to the
other. The operator may hear "click-clack" as the one breaker opens and then the other
breaker closes.
•
Main busbar to emergency genset supply
: The generator breaker closes as soon as
the tie breaker open feedback is detected, unless there is a
Generator breaker
transfer delay
.
•
Emergency genset to main busbar supply
: The tie breaker closes as soon as the
generator breaker open feedback is detected, unless there is a
Tie breaker transfer
delay
.
Enabled
: The controller adjusts the speed of the emergency genset to synchronise the tie
breaker. The tie breaker and generator breaker can both be closed at the same time. If
the emergency genset controller does not control the governor, then the generator
breaker can only close if there is a blackout on the emergency busbar.
Tie breaker
transfer delay
0 to 10 s
0.5 s
This parameter only has an effect if
Tie breaker sync. enabled
is
Not enabled
. The
controller starts the timer when it detects generator breaker open feedback. The tie
breaker cannot close while the delay timer is running.
9.5.3 Generator breaker close flowchart
The following flowchart below shows the sequence that the controller uses to close the generator breaker for the emergency genset.
This flowchart does not apply to switchboard control. When the controller is under switchboard control, it will not close the breaker.
For example, if the operator presses the push-button
Close breaker
on the display unit, the controller ignores this command.
DESIGNER'S HANDBOOK 4189340911K UK
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