TROUBLESHOOTING
12.
Troubleshooting
12.1
Protection Responses
When a protection condition is detected, the EMX3 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 EMX3 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 EMX3 has issued a warning, the soft starter will reset itself once the cause of the warning has been resolved.
12.2
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 Settings and parameter group 16 Protection Action, other settings are built-in system protections and
cannot be set or adjusted.
Display
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.
Related parameters: 15D
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 EMX3 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: 16M
Controller
This is a name selected for a programmable input. Refer to Input A 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: 4H, 4I, 16E
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 2D
Current Limit
has been set too low
•
parameter 2B
Start Ramp Time
has been set greater than the setting for 4A
Excess Start Time
setting
•
parameter 2B
Start Ramp Time
is set too short for a high inertia load when using Adaptive Control
Related parameters: 1A, 9B, 2D, 2B, 4A, 10D, 10B, 4B, 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 parameters: None
User Manual (710-04840-00M) |
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