22
Carlo Gavazzi LTD
RSWT
RSWT DS ENG
17/05/2018
Number of flashes
2
Alarm
Wrong phase sequence
Alarm description
If the connection to the soft starter is not done in the correct sequence (L1,
L2, L3), the RSWT will trigger the wrong phase sequence alarm and the motor
will not be started.
Alarm recovery period
N/A
Consecutive alarms for hard reset
1
Action to recover alarm
User intervention is required to change the wiring sequence to recover alarm.
Note: the phase sequence monitoring can be disabled. To disable the alarm,
press the Test/Reset button for 10 seconds when the RSWT is in IDLE state.
The yellow LED will turn ON.
ATTENTION: in this mode, if the wiring is not in the correct sequence, the mo-
tor will rotate in the reverse direction.
Troubleshooting
•
Check that wiring on L1, L2, L3 is in the correct sequence.
•
If you need to reverse the motor, make sure that the phase sequence LED
is ON (phase sequence protection disabled).
Number of flashes
3
Alarm
Line voltage out of range
Alarm description
At every power-up the RSWT automatically detects the supply voltage level
and determines whether it is working on a 220, 400, 480* or 600* V supply.
The under- or over- voltage alarm level is then set at a level of -20% and +
20% (from the measured supply voltage level) respectively.
If the supply voltage level is out of these limits for more than 5 seconds then
the line voltage out of range alarm will be triggered.
* Applies to RSWT60 models.
Note: for RSWT60 over-voltage alarm level (for the case of a 600V supply) is
675V (600V + 11%).
Alarm recovery period
5 minutes
(If manual reset mode is applied, alarm can be reset by pressing the Test/
Reset button).
Consecutive alarms for hard reset
4
Action to recover alarm
The alarm will self-recover (in auto-recovery mode) after 5 minutes from when
the supply voltage is within limits.
Troubleshooting
•
Check supply voltage level across L1, L2, L3 terminals.
•
Make sure that you are not using a RSWT40 model on a supply voltage >
440 VAC.
Number of flashes
4
Alarm
Phase loss (motor side)
Alarm description
If any of the phases on the load (motor) side becomes open the RSWT will
trip after 5 seconds to protect the motor from running/ starting on 2 phases.
Note: this alarm will also be triggered when a current unbalance of > 20% is
detected on any of the three line currents for a minimum of 5 secs. Addition-
ally if a SCR and/or bypass relay is open (damaged) the same alarm will be
triggered.
Alarm recovery period
5 minutes
(If manual reset mode is applied, alarm can be reset by pressing the Test/
Reset button).
Consecutive alarms for hard reset
4
Action to recover alarm
Check connections on the output side of the soft starter and on the motor
terminals. The alarm will self-recover (in Auto-recovery mode) after 5 minutes.
Troubleshooting
•
Check for any loose connections on the T1, T2, T3 side of the soft starter.
•
Check for any loose connections on the motor terminals.
•
Check motor windings.
