InteliATS
NT
PWR, SW version 1.0, ©ComAp – March 2009
48
IA-NT- PWR-1.0-Reference Guide R1.pdf
N
OTE
:
The breakers are internally locked to close two voltages against each. The controller will automatically
recognize if the breaker can be closed, it means it is never possible to close both breakers together
N
OTE
:
If some voltage arises on generator bus (e.g. gen-set was started externally - not via IA-NT), generator
LED blinks and [Stop], [MCB], [GCB] buttons are inactive. To bring them into operation [Start] button
has to be pressed - it will synchronize IA-NT with gen-set state.
C
AUTION
!
The MCB can be opened manually in MAN mode. Accidental opening the MCB will cause the object
(load) will remain without power!!!
AUT
The engine is started and stopped either by the binary input
Rem Start/Stop
or by the AMF
mechanism or by the manual transfer request via
Rem Transfer
binary input. Buttons MCB, GCB,
START, STOP including the appropriate binary inputs for external buttons are not active. The full start
sequence up to the moment when the engine is loaded is automatic as well as unloading and stop
sequence.
The controller behavior when gen-set is stopped and restarted again whilst the mains failure
constantly persists:
•
If the problem on the gen-set side appears, all faults messages are auto-quit and no next
operation is be blocked
•
Gen-set Start/Stop signal stays active
•
Controller waits for gen-set parameters are OK (means GenReadyToLoad signal is activated or
generator voltages are in allowed limits) and then GCB is reclosed
•
For ensuring GCB Open/Close output remains off whilst Gen Voltage is OK long enough to
rewind the Circuit breaker to the off position use the
Transfer Del
setpoint
AMF sequence (simplified)
State
Condition of the transition
Action
Next state
Mains failed
1
or MCB feedback dropout
MCB Opens On
= MAINSFAIL
MCB CLOSE/OPEN off
EmergStart Del
timer started
Mains failure
Mains
operation
Mains failed
1
or MCB feedback dropout
MCB Opens On
= GENRUN
EmergStart Del
timer started
Mains failure
Mains voltage and frequency OK
MCB Opens On
= MAINSFAIL
After elapsing
MCB Close Del
MCB CLOSE/OPEN on
Mains operation
Mains voltage and frequency OK
MCB Opens On
= GENRUN
None
Mains operation
EmergStart Del
elapsed
MCB Opens On
= MAINSFAIL
Engine start sequence performed,
then
GCB CLOSE/OPEN on
2
Island operation
Mains
failure
EmergStart Del
elapsed
MCB Opens On
= GENRUN
Engine start sequence performed,
then MCB CLOSE/OPEN off, time
delay
Transfer Del
performed and
GCB CLOSE/OPEN on
2
Island operation
Island
operation
Mains voltage and frequency OK
MainsReturnDel
timer started
Mains return
Mains failed
Island operation
Mains
return
MainsReturnDel
elapsed
GCB CLOSE/OPEN off, then after
Transfer Del
MCB CLOSE/OPEN
on and then engine stop sequence
performed
3
Mains operation
1
Mains failed means mains over/under -voltage, over/under -frequency, voltage assymetry (preset
delay must elapse)
