Specifications

Softstart UK Troubleshooting
11. Troubleshooting
11.1. Protection Responses
When a protection condition is detected, the LV-DS 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 LV-DS 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 LV-DS has issued a warning, the soft starter will reset itself once the cause of the warning has been
resolved.
11.2. 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 4 Protection Levels and parameter group 16 Protection Action, other settings
are built-in system protections and cannot be set or adjusted.
Display
Possible cause/Suggested solution
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 LV-DS 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.
Related parameters: 16K
Controller
This is a name selected for a programmable input. See Input trip.
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: 4A, 5B, 16B
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 parameters: None
Excess start time
Excess start time trip can occur in the following conditions:
• parameter 1A Motor Full Load Current is not appropriate for the motor
• parameter 2B Current Limit has been set too low
• parameter 2D Start Ramp Time has been set greater than the setting for 2G
Excess Start Time setting
• parameter 2D Start Ramp Time is set too short for a high inertia load when
using Adaptive Control
Related parameters: 1A, 1C, 2B, 2D, 2G, 3B, 3D, 3G, 16H
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 parameters: None
FLC too high
The LV-DS 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 parameter 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
8).
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 parameters: 1A, 1C
710-15797-00A – LV-DS User Manual 57/64