V180808N
T-APS Users Manual
Page 12
NC
NO
COM
8. Alarm Contacts
Alarm
The Alarm relay Contact definition:
NC Contact - Closed conditions:
1. Power supply OFF.
2. Circuited error detected, and T-APS switches from working path to protection path. Failure LED
will be also ON. Once all errors have been cleared, T-APS will switch back to working path, and
the NC contacts will return to an open state and the Failure LED will then be OFF.
NC Contact - Open conditions:
1. Power supply ON.
2. T-APS operating normally in working path.
There is a self-diagnostic test feature built into the T-APS which will change the contacts in the event of T-APS
unit failure.
Contacts shown in de-energized state,
T-APS is powered Off. COM is connected to
NC
