3
Carlo Gavazzi Ltd.
RSBS Troubleshooting Guide - Rev 1.0
01/06/20
Troubleshooting
EN
Flashing sequence when user intervention is required
In the case where user intervention is required to perform a hard reset, the flashing sequence of the alarm will be followed
by a 6 s OFF period followed by the flashing sequence. This flashing sequence will repeat itself until a hard reset is per
-
formed.
Number of flashes
2
Alarm
Under voltage
2
Alarm description
The under voltage alarm will be triggered when the supply voltage (Ue) is:-
Condition 1: Ue < 190 VAC for ≥ 1 s
Condition 2: 140 VAC < Ue < 160 VAC for ≥ 200 ms
Condition 3: 90 VAC < Ue < 140 VAC for ≥ 100 ms
Condition 4: Ue = 0 VAC for > 50 ms (+20 ms)
Alarm recovery period
5 mins (from the moment when voltage is within operational range)
Consecutive alarms for
hard reset
N/A
Action to recover alarm
The alarm will self-recover after the recovery period. Voltage dips/interruptions during re-
covery between starts and/or alarm recovery shall be ignored.
Troubleshooting
• Check for any loose connections on L / L1 and N / L2 terminals.
• Check quality and level of supply voltage after compressor starts.
2. The under-voltage alarm is only active in bypass state
Number of flashes
3
Alarm
Locked rotor
Alarm description
The locked rotor alarm will be triggered when the measured current (in bypass state) ex-
ceeds 32 AAC. The alarm trigger time will vary according to the chart below.
Alarm recovery period
5 minutes
Consecutive alarms for
hard reset
4
Action to recover alarm
The alarm will self-recover after the recovery period. If this alarm is triggered on two con-
secutive starts, user intervention will be required to reset the power supply (L/L1 & L2/N).
Troubleshooting
• Check compressor windings resistance to check if motor is damaged.
• Check for any blockage in the system.
Measured current (Arms)
Time to trip (s)
33.6
1
35.2
0.5
38.4
0.2
41.6
0.1
≥ 44.8
0.05