Specifications

Softstart UK Troubleshooting
Symptom
Probable Cause
The soft starter does not
control the motor correctly
during starting.
• Start performance may be unstable when using a low
Motor Full Load
Current setting (parameter 1A). This can affect use on a small test motor
with full load current between 5 A and 50 A.
• Power factor correction (PFC) capacitors must be installed on the supply
side of the soft starter. To control a dedicated PFC capacitor contactor,
connect the contactor to run relay terminals.
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 6D 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.
Erratic motor operation.
• The SCRs in the LV-DS require at least 5 A of current to latch. If you are
testing the soft starter on a motor with full load current less than 5 A, the
SCRs may not latch correctly.
Erratic and noisy motor
operation.
• If the soft starter is connected to the motor using inside delta configuration,
the soft starter may not be correctly detecting the connection. Contact
your local supplier for advice.
Soft stop ends too quickly.
• The soft stop settings may not be appropriate for the motor and load.
Review the settings of parameters 2H, 2I, 3H and 3I.
• If the motor is very lightly loaded, soft stop will have limited effect.
Adaptive Control, brake, jog
and PowerThrough functions
not working.
• These features are only available with in-line installation. If the LV-DS is
installed inside delta, these features will not operate.
After selecting Adaptive
Control the motor used an
ordinary start and/or the
second start was different to
the first.
• The first Adaptive Control start is actually 'Constant Current' so that the
starter can learn from the motor characteristics. Subsequent starts use
Adaptive Control.
PowerThrough does not
operate when selected.
• The starter will trip on Lx-Tx Shorted on the first start attempt after control
power is applied. PowerThrough will not operate if control power is cycled
between starts.
Parameter settings cannot be
stored.
• Make sure you are saving the new value by pressing the ENTER button
after adjusting a parameter setting. If you press EXIT, the change will not
be saved.
• Check that the adjustment lock (parameter 15B) is set to Read & Write. If
the adjustment lock is set to Read Only, settings can be viewed but not
changed. You need to know the security access code to change the
adjustment lock setting.
• The EEPROM may be faulty on the keypad. A faulty EEPROM will also
trip the soft starter, and the keypad will display the message Parameter out
of Range. Contact your local supplier for advice.
Remote keypad shows
message "awaiting data"
The keypad is not receiving data from the control PCB. Check the cable
connection.
710-15797-00A – LV-DS User Manual 61/64