Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 60

Motor temperature too high
This error occurs when the temperature on the motor is higher than the 'Maximum Motor Temperature' that is configured (refer
paragraph 5.2.1). The soft starter will trip and only allow a restart again when the motor has cooled down to below the configured
'Motor restart temperature'.
i. The error may occur because of overuse of the JOG function.
ii. Check the motor.
iii. Check the load.
iv. If there is no overuse or abnormal load or environmental conditions that may contribute to this issue and the soft starter
repeatedly trips on this error, please contact your motor supplier for advice.
Bypass contactor not detected
This error occurs where the soft starter is configured for a bypass contactor which is not present or not working as it should.
After the start ramp is completed, the soft starter closes the bypass relay and then switches off the SCRs (in which case the motor
will coast to a stop when it should be running, and will switch on hard when it should be stopping if the bypass contactor is not
in place).
i. This is most probably a configuration error – if the bypass contactor is not present, ensure that the dip switch on the
HMI is in the correct position showing that a bypass contactor is not present.
ii. The error may be due to a wiring problem where the bypass contactor is not being activated when the start ramp is
completed. Refer to Figure 28.
iii. Confirm that the soft starter output is functioning correctly: First configure for no bypass contactor and start the motor.
Measure the Bypass output on the green connector X1. This contactor should be closed when the start ramp is
completed. (Note that this switching of the relay happens in any case – whether configured for bypass or not).
iv. Confirm that the Contactor is functioning correctly and that it does close when an appropriate activation signal is
applied.
v. If the soft starter is malfunctioning, please contact your distributor for support.
No communication on Modbus interface
If a Modbus Master device is connected to the RTU (RS485) Modbus port on the Core variant soft starter, the soft starter should
start communicating when polled for data. The Power LED should start flashing faster at 1Hz (refer paragraph 5.1), indicating
that communication with the Modbus master has been established. The default settings for the RTU Modbus interface is as
specified in paragraph 10.1, with a Modbus address of 1.
i. Check the communication settings on the Modbus master and confirm that they are correct.
ii. If the Modus master is running on a PC, ensure that the correct drivers for the Modbus RTU (to USB) cable is installed
on the PC.
iii. If it is possible that the Modbus settings on the soft starter-side have been changed or tampered with, do the following
to restore factory defaults on the Modbus settings:
a. Switch power off;
b. Unplug all Modbus RTU cables;
60 Basic operation – Core models