Specifications

Troubleshooting Softstart UK
Display
Possible cause/Suggested solution
Time-overcurrent
The LV-DS is internally bypassed and has drawn high current during running.
(The 10A protection curve trip has been reached or the motor current has risen
to 600% of the motor FLC setting.)
Related parameters: None
Undercurrent
The motor has experienced a sharp drop in current, caused by loss of load.
Causes can include broken components (shafts, belts or couplings), or a pump
running dry.
Related parameters: 4C, 5C, 16C
Unsupported option
(function not
available in inside
delta)
The selected function is not available (eg jog is not supported in inside delta
configuration).
Related parameters: None
Vibration Alarm
This is a name selected for a programmable input. See Input trip.
VZC Fail Px
Where 'X' is 1, 2 or 3.
Internal fault (PCB fault). Contact your local supplier for advice.
This trip is not adjustable.
Related parameters: None
11.3. General Faults
This table describes situations where the soft starter does not operate as expected but does not trip or give a
warning.
Symptom
Probable Cause
Starter "Not Ready"
• Check Input A (53, 55). The starter disable function may be active. If
parameter 6D is set to Starter Disable and there is an open circuit on 53,
55, the LV-DS will not start.
The soft starter does not
respond to the START or
RESET
button on the keypad.
• 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
LOCAL/REMOTE 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
LOCAL/REMOTE 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 (see Control Wiring on page 12 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 5A Restart Delay.
• The motor may be too hot to permit a start. If parameter 4F 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 6D is
set to Starter Disable and there is an open circuit on 53, 55, the LV-DS will
not start. If there is no further need to disable the starter, close the circuit
on the input.
NOTE
Parameter 6A Local/Remote controls when the LOCAL/REMOTE
button is enabled.
A reset does not occur after an
Auto-Reset, when using a
remote two-wire control.
• The remote 2-wire start signal must be removed and reapplied for a
re-start.
Non-resettable Thermistor Cct
trip, when there is a link
between the thermistor input
64, 65 or when the motor
thermistor connected between
64, 65 is permanently
removed.
• The thermistor input is enabled once a link is fitted and short circuit
protection has activated.
• Remove the link then load the default parameter set. This will disable
the thermistor input and clear the trip.
• Place a 1k2 Ω resistor across the thermistor input.
• Turn thermistor protection to 'Log only' (parameter 16G).
60/64 710-15797-00A – LV-DS User Manual