Digistart D3: User Guide 91
Issue: G
9 Diagnostics
NOTE
The Digistart D3 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 D3 will write this to the event log and may also trip or issue a
warning. The soft starter's response depends on the Protection Action setting (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 D3 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 D3 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 the 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.
Possible cause/Suggested solution
2 Phase - Damaged SCR
This message is displayed if the soft starter tripped on “ Lx-Tx shorted” during the pre-start
checks and PowerThrough is enabled. It indicates that the starter now operates in
PowerThough mode (2-phase control only).
Check for either a shorted SCR or a short within the bypass contactor.
Analog input trip
This fault only occurs if the Input/Output expansion card is fitted. Identify and resolve the
condition which caused Analog Input A to activate.
Battery/clock
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. The Digistart D3 will
continue to soft start and soft stop correctly. Reprogram the date and time.
The battery is not removable. In order to replace the battery, the main control PCB must be
replaced.
Current imbalance
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 Nidec or your local distributor.
Current Read Err Lx
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.
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