TROUBLESHOOTING
LED locations
The non-conduction and firing LEDs are located on the power interface PCB. The non-conduction LEDs should
dim during starting, and should be off when the bypass contactor closes. The firing LEDs should be on during
starting, and off just before the bypass contactor closes and the soft starter enters run mode.
The gate drive adaptor, gate drive and gate drive firing PCBs are located on individual phase arm power assemblies.
11 Non-conduction LEDs (green)
22 Firing LEDs (red)
13.3
General Faults
This table describes situations where the soft starter does not operate as expected but does not trip or give a
warning.
SSymptom
PProbable Cause
The soft starter does not respond to
the SSTART or R
RESET button on the
controller.
The soft starter may be in Remote control mode. When the soft starter
is in Remote control mode, the Local LED on the starter is off. Press the
LCL/RMT button once to change to Local control.
The soft starter does not respond to
commands from the control inputs.
The soft starter may be in Local control mode. When the soft starter is in
Local control mode, the Local LED on the starter is on. Press the
LCL/RMT button once to change to Remote control.
The control wiring may be incorrect. Check that the remote start, stop
and reset inputs are configured correctly (refer to
Control Wiring on page
28 for details).
The signals to the remote inputs may be incorrect. Test the signalling by
activating each input signal in turn. The appropriate remote control input
LED should activate on the starter.
The soft starter does not respond to
a start command from either the
local or remote controls.
The soft starter may be waiting for the restart delay to elapse. The length
of the restart delay is controlled by parameter 4M
Restart Delay.
The motor may be too hot to permit a start. If parameter 4N
Motor
Temperature Check is set to Check, the soft starter will only permit a start
when it calculates that the motor has sufficient thermal capacity to
complete the start successfully. Wait for the motor to cool before
attempting another start.
The starter may be disabled via a programmable input. If parameter 6A is
set to Starter Disable and there is an open circuit on C53, C54, the MVS
will not start. If there is no further need to disable the starter, close the
circuit on the input.
NOTE
Parameter 6Q
Local/Remote controls when the LLCL/RMT button is
enabled.
Motor does not reach full speed.
If the start current is too low, the motor will not produce enough torque
to accelerate to full speed. The soft starter may trip on excess start time.
NOTE
Make sure the motor starting parameters are appropriate for the
application and that you are using the intended motor starting
profile. If parameter 6A or 6F is set to Motor Set Select, check
that the corresponding input is in the expected state.
The load may be jammed. Check the load for severe overloading or a
locked rotor situation.
C73
C74
13
14
23
24
33
34
43
44
V IN
1 2 3
1 2 3
V0 V1 V2 V3
TX RX
CT3
CT2
CT1
C1 C2 C3 C4 C5 C6
16948.B
1
2
76
MVS Panel User Manual
710-13937-00C
Содержание MVSxxxx-V02
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