Quick Start
Commissioning
Digistart IS User Guide 73
Issue: 4 www.controltechniques.com
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 (Pr 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.
Make sure the motor starting parameters are appropriate for the application
and that you are using the intended motor starting profile. If Pr 3A or 3F 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.
The SCRs in the Digistart IS 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 Pr 2H, 2I, 12H and 12I.
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 Digistart IS 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.
The keypad is not receiving data from the control PCB. Check the cable connection
and the fitting of the display on the starter.
Corrupted text shown on keypad display.
The keypad may not be screwed down, resulting in an intermittent connection.
Screw down the keypad or hold squarely in place.
Check that the keypad has not been screwed down too tightly. Loosen screws
slightly.
Parameter settings cannot be stored.
Make sure you are saving the new value by pressing the M button after adjusting a
parameter setting. If you press , the change will not be saved.
Check that the adjustment lock (Pr 15C) is turned off. If the adjustment lock is on,
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.
Starter reports "Power On" when Run
Simulation is activated.
The soft starter will not activate Run Simulation with three-phase power connected.
This prevents unintentional direct on-line (DOL) start.
Check the fuse rating and ensure that the selected starting method matches with
the application.
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