Troubleshooting Using The Fault Display On The Soft Starter - Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual

Fault screen with RESET button

Troubleshooting using the fault display on the soft starter

If the displayed message does not correspond to any of the following or if you have any other problem, please contact your
sales representative.
The possible fault messages that the soft starter may display, are listed in the table below together with a detailed
description of the fault and corrective actions.
If you need assistance with troubleshooting, it will be helpful if you can attach a photo of the screen with the fault message.
Fault Message
1.
Motor Protection Curve Trip
Applicable during STARTING
and RUNNING.
2.
Start Overcurrent
Applicable during STARTING.
102 Protective functions
Parameter
RPM
Gbal
Mbal
RemINH
RlySht
Ibal
RemStrt
ExtRst
RlyRun
RlyRdy
RlyFan
Vu
Vv
Vw
Vum
Vvm
Vwm
0 A
alpha
Freq
Rot
Mtemp
HS1
HS2
HS3
Amb
Figure 61 – MEsoftstart/I Pro TFT display Fault screen
Description
This trip may occur during Starting or Running
and is time related to the protection curves,
depending on which curve and by what
proportion of the Motor Full Load Current, the
motor is drawing.
An over current was detected during start-up.
This trip occurs when the "Maximum Starting
Current" is exceeded during the start ramp.
This limit is defined by parameter "Overload
.protection class" as described in paragraph
6.4.1.
Description
- Revolutions per Minute (Motor Shaft Speed)
- Grid voltage imbalance%
- Motor side voltage imbalance%
- Switching card inhibit relay status
- Shunt Trip relay status
- Current imbalance%
- Remote start signal
- External Reset signal
- Run Relay output signal (True while soft starter is Starting,
Running and Stopping the motor)
- Ready Relay output signal (True if ready to start the motor)
- Fan Relay output signal – this is just an indication that the
fan is switched on or off. Check that the fan is blowing when
this signal is active.
- Line voltage on phase 1
- Line voltage on phase 2
- Line voltage on phase 3
- Motor side voltage on phase 1
- Motor side voltage on phase 2
- Motor side voltage on phase 3
- RMS current
- An indication of the percentage of switch pulses on the
switching elements
- Line voltage frequency
- Phase rotation (Clockwise, anti-clockwise or undefined)
- Motor temperature
- Heat sink #1 temperature
- Heat sink #2 temperature
- Heat sink #3 temperature
- Ambient temperature inside the soft starter
Corrective action
If the motor allows, select a more lenient
trip curve (Protection Class). (Refer
paragraph 6.4.1).
Check the motor current specification
and confirm that the "Maximum Starting
Current" (refer 6.4.4) is set to an
appropriate value in relation to the
"Ramp-up time" (refer 6.4.1).
Also confirm that the "Maximum Ramp-
up time" is at least twice the length of
the time set for "Ramp-up time".