InteliATS
NT
PWR, SW version 1.0, ©ComAp – March 2009
54
IA-NT- PWR-1.0-Reference Guide R1.pdf
Voltage phase sequence detection
InteliATS
NT
controller detects phase sequence on both generator and mains/bus voltage terminals.
These protections are important after controller installation to avoid wrong voltage phases phase
connection. Following alarms can be detected:
Wrong phase sequence
There is fix defined phase sequence in InteliATS
NT
controller L1, L2, L3. When the phases are
connected in different order (e.g. L1, L3, L2 or L2, L1, L3) following alarms are detected:
Gen CCW Rot = wrong generator phase sequence
Mains CCW Rot = wrong mains phase sequence
GCB, MCB fail detection
MCB or GCB fail detection is based on binary output CB close/open comparing with binary input CB
feedback.
There are three different time delays for CB fail detection – see following diagrams.
When is BO GCB close/open (MCB Close/Open) in steady state and GCB feedback (MCB feedback)
is changed the GCB fail is detected immediately (no delay).
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
Alarm detection:
immediatelly
active
closed
opened
Alarm: GCB fail
BI GCB feedback
BO GCB close/open
Alarm detection:
immediatelly
active
opened
closed
When BO GCB close/open (MCB Close/Open) opens there is 5 sec delay for GCB fail (MCB fail)
detection
.
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
active
opened
opened
Time delay
5 sec
When BO GCB close/open (MCB Close/Open) closes, there is 5sec delay for GCB fail (MCB fail)
detection:
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
active
closed
closed
Time delay
5 or 2 sec
N
OTE
:
You can solve state of MCB fail by pressing Fault Reset button.
