Nidec Digistart D4 - Troubleshooting; Protection Responses; Trip Messages

Troubleshooting
10 Troubleshooting
10.1 Protection Responses
When a protection condition is detected, the soft starter 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 6).
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 soft starter 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 soft starter has issued a warning, the soft starter will reset itself once the cause of the
warning has been resolved.
10.2 Trip Messages
Display
Possible cause/Suggested solution
Bypass overload
This trip is not adjustable.
Bypass overload protection protects the soft starter from severe
operating overloads while running. The soft starter will trip if it detects
overcurrent at 600% of the contactor rating.
Related parameters: None
Current at Stop
The soft starter has detected current at a time when no current is
expected (Ready, Not Ready or Tripped states).
Related parameters: None
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 parameters: 5A, 5B, 6C
Current Read Err
Lx
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.
Related parameters: None
Depth Sensor
The smart card has detected a fault with the depth sensor.
Related parameters: 30L, 36C
EEPROM fail
An error occurred loading data from the EEPROM to RAM when the
keypad powered up. If the problem persists, contact your local
distributor.
Related parameters: None
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