Cause : Internal communication error comes when the drive's internal thermal overload protection circuit has tripped due to excessive heat buildup.

The fault EoL4 in Delta MS300 drive indicates an Internal communication error. This fault comes when output current greater then 105% of the motor 4 rated current.

1. Reduce the load.
2. Increase the setting value for Pr.01-12–01-19 (accel./ decel. time)
3. Reset to the correct motor rated current.
4. Reset to the correct motor rated frequency.