15
Carlo Gavazzi Ltd.
RSBS
RSBS DS ENG
27/05/20
Number of flashes
7
Alarm
Compressor running in reverse
Alarm description
The RSBS shall detect that the compressor is rotating in the reverse direction within 2
seconds. The alarm is active in bypass state only.
Alarm recovery period
5 minutes
Consecutive alarms for
hard reset
4
Action to recover alarm
The alarm will self-recover after the recovery period.
Troubleshooting
• Check for unstable or low supply voltage level.
Number of flashes
8
Alarm
Load loss
Alarm description
This alarm will be triggered when the load current is ≤ 2 AAC for ≥ 1 mains cycle. The alarm
will be active during ramp-up and bypass mode.
Ramp-up: As soon as the ON signal is turned ON, the RSBS will start the ramp-up func-
tion. If the measured current is ≤ 2 AAC then the RSBS will not attempt a start
and will raise the load loss alarm.
Bypass: If during bypass the measured current is ≤ 2 AAC for ≥ 1 mains cycle, the RSBS
will trigger the load loss alarm.
Alarm recovery period
5 minutes
Consecutive alarms for
hard reset
N/A
Action to recover alarm
The alarm will self-recover after the recovery period. Load current will not be monitored
during recovery from alarm. If, during transition from alarm recovery to start of ramp-up,
the measured current is ≤ 2 AAC ≥ 1 mains cycle the RSBS will re-trigger the alarm.
The alarm will self-recover after 5 minutes.
Troubleshooting
• Check that the compressor (or a load > 2 Arms) is connected to the RSBS.
• Check quality of supply. This alarm may also be triggered when there is complete supply
voltage interruption.
Number of flashes
10
Alarm
Welded main relay, Shorted SCR, Welded bypass relay
Alarm description
This alarm will be triggered when :-
1. The RSBS detects a current on the “L” connection when it is in IDLE state. (Fault:
Welded main relay). In this case the RSBS will trigger the alarm after 100 ms.
2. The RSBS detects a current > Imax HP during ramp-up state (Fault: SCR short or
bypass relay welded). The RSBS will trigger the alarm after ≈ 100 ms.
Alarm recovery period
Non-recoverable alarm
Consecutive alarms for
hard reset
1
Action to recover alarm
The alarm will not self-recover. In case of a main relay weld condition the user needs to
provide an external means to disengage the compressor from the mains. (Since the aux-
iliary winding will remain connected to L and N through the main relay and run capacitor).
Troubleshooting
• Replace RSBS and contact your local Carlo Gavazzi representative.
• Check compressor winding resistance and verify that this is within manufacturer speci
-
fications.