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Commissioning
Digistart IS User Guide 69
Issue: 4 www.controltechniques.com
9. Diagnostics
The Digistart IS soft starter is not user serviceable. The unit should only be serviced by authorised service personnel.
Unauthorised tampering with the unit will void the product warranty.
9.1 Protection responses
When a protection condition is detected, the Digistart IS will write this to the event log and may also trip or issue a warning. The soft
starter's response to some protections may depend on the Protection Action settings (parameter group 16).
Some protection responses cannot be adjusted by the user. These trips are usually caused by external events (such as phase loss)
or by a fault within the soft starter. These trips do not have associated parameters and cannot be set to Warn or Log.
If the Digistart IS trips you will need to identify and clear the condition that triggered the trip, then reset the soft starter before
restarting. To reset the starter, press the RESET button on the keypad or activate the Reset remote input.
If the Digistart IS has issued a warning, the soft starter will reset itself once the cause of the warning has been resolved.
9.2 Trip messages
This table lists soft starter's protection mechanisms and the probable cause of the trip. Some of these can be adjusted using
parameter group 5 Protection Settings and parameter group 16 Protection Action, other settings are built-in system protections and
cannot be set or adjusted.
Table 9-1 Trip messages
Possible cause/Suggested solution
This fault only occurs if the Input/Output expansion card is fitted. Identify and resolve the condition which
caused Analog Input A to activate.
Related Pr: 8A, 8B, 8C
A verification error has occurred on the real time clock, or the backup battery voltage is low. If the battery
is low and the power is off, date/time settings will be lost. Reprogram the date and time.
Related Pr: 16O
Current imbalance can be caused by problems with the motor, the environment or the installation, such
as:
An imbalance in the incoming mains voltage
A problem with the motor windings
A light load on the motor
A phase loss on input terminals L1, L2 or L3 during Run mode
An SCR that has failed open circuit. A failed SCR can only be definitely diagnosed by replacing the SCR
and checking the starter's performance.
Related Pr: 5C, 6A, 16C
Please contact Control Techniques or your local distributor.
Where 'X' is 1, 2 or 3.
Internal fault (PCB fault). The output from the CT circuit is not close enough to zero when the SCRs are
turned off. Contact your local supplier for advice.
This trip is not adjustable.
Related Pr: None
Excess start time trip can occur in the following conditions:
Pr 1A Motor Full Load Current is not appropriate for the motor
Pr 2B Current Limit has been set too low
Pr 2D Start Ramp Time has been set greater than the setting for 5A Excess Start Time setting
Pr 2D Start Ramp Time is set too short for a high inertia load when using Adaptive Control
Related Pr: 1A, 2D, 2B, 5A, 5B, 11A, 12D, 12B, 16B
Where 'X' is phase 1, 2 or 3.
The SCR did not fire as expected. The SCR may be faulty or there may be an internal wiring fault.
This trip is not adjustable.
Related Pr: None
FLC too high (FLC out of
range)
This trip is not adjustable.
The Digistart IS can support higher motor full load current values when connected to the motor using
inside delta configuration rather than in-line connection. If the soft starter is connected in-line but the
programmed setting for Pr 1A Motor Full Load Current is above the in-line maximum, the soft starter will
trip at start (see Minimum and Maximum Current Settings).
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.
Related Pr: 1A, 11A
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