InteliATS
NT
PWR, SW version 2.5, ©ComAp – May 2015 79
IA-NT- PWR-2.5-Reference Guide.pdf
2
If during start-up sequence mains returns, then MCB is reclosed with delay MCB Close Del (if
opened, depending on MCB Opens On setpoint) and start-up sequence is interrupted.
3
If mains fails during stop procedure (cooling) again, stop sequence is interrupted, MCB opened and
GCB reclosed with delay Transfer Del.
See also chapters: Circuit breakers timing and AMF time chart.
WARNING!
If an red alarm is present and the gen-set is in AUT mode, it can start by self after all red alarms
becomes inactive and are acknowledged!!!
TEST
The behavior of the controller in TEST mode depends mainly on setting of the ReturnFromTEST
setpoint.
Automatic return
Setpoint ReturnFromTEST = AUTO.
The gen-set will be started when the controller is put to TEST mode and will remain running unloaded.
If a mains failure occurs, the MCB will be opened and after Transfer Del the GCB will be closed and
the gen-set will supply the load. After mains is recovered, the delay MainsReturnDel will count
down and if elapses and the mains is still ok, the controller will transfer the load back to the
mains and the gen-set will remain running unloaded again until the mode is changed.
Manual return
Setpoint ReturnFromTEST = MANUAL.
The gen-set will be started when the controller is put to TEST mode and will remain running unloaded.
If a mains failure occurs, the gen-set will take the load.
The load can be transferred to the gen-set also manually:
If the MCB button is pressed, the controller will open the MCB, then wait for Transfer Del and
finally close the GCB.
Once the load is supplied by the gen-set, the gen-set remains supplying it until the controller is
switched to other mode.
Test with load
If the binary input Rem TEST OnLd is activated, the controller is switched to TEST mode (i.e. the gen-
set will be started as described above), but once started the controller will automatically make a
switchover, i.e. open MCB, wait for Transfer Del and close GCB.
After the binary input Rem TEST OnLd has been deactivated, the controller goes back to previous
operation mode and it's behavior depends on it. In most cases it will be AUT mode and the controller
will either stay supplying the load if the mains is failed, or will transfer the load back to the mains.
Periodic exercises
The output from the Exerc timer 1 is internally connected to the Remote TEST binary input to enable
periodic testing of the gen-set.
The controller must have AUT mode selected by mode buttons and other "mode forcing" binary inputs
must not be active to ensure proper function of the exercise.
NOTE:
If a Trip or other red alarm comes while the load is supplied from the gen-set and the mains is healthy,
the load is switched back to the mains.
CAUTION!
The gen-set starts automatically and is always running in TEST mode!
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