Diagnostics; Protection Responses; Trip Messages - Emerson Leroy Somer DIGISTART D3 User Manual

Safety Rating Mechanical
Information Data Installation
9.

Diagnostics

The Digistart D3 soft starter is not user serviceable. The unit should only be serviced by authorised service personnel.
NOTE
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 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
Display
2 Phase - Damaged 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
SCR
control only).
Check for either a shorted SCR or a short within the bypass contactor.
Related Pr: 15D
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.
Related Pr: 8A , 8B , 8C
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. Reprogram the date and time.
Related Pr: 16O
Current imbalance Current imbalance can be caused by problems with the motor, the environment or the installation, such
as:




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 LEROY-SOMER or your local distributor.
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.
This trip is not adjustable.
Related Pr: None
Excess start time Excess start time trip can occur in the following conditions:




Related Pr: 1A , 2B , 2D , 5A , 5B , 11A , 12B , 12D , 16B
Firing Fail Px 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
This trip is not adjustable.
The Digistart D3 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 on page 11).
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
Digistart D3 User Guide
Issue: F
Electrical Keypad Quick Start
Installation and Status Commissioning
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
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
Operation Programming Diagnostics
Possible cause/Suggested solution
Application Technical Maintenance Options
Examples Data
71