Mitsubishi Electric FR-E700 Instruction Manual page 222

Selection and protection of a motor
NOTES
Fault by electronic thermal relay function is reset by inverter power reset and reset signal
input. Avoid unnecessary reset and power-off.
When multiple motors are operated by a single inverter, protection cannot be provided by
the electronic thermal relay function. Install an external thermal relay to each motor.
When the difference between the inverter and motor capacities is large and the setting is
small, the protective characteristics of the electronic thermal relay function will be deterio-
rated. In this case, use an external thermal relay.
A special motor cannot be protected by the electronic thermal relay function. Use the exter-
nal thermal relay.
The operation time of the transistor protection thermal relay shortens when the Pr. 72 "PWM
frequency selection" setting increases.
Electronic thermal relay does not work when 5 % or less of inverter rated current is set to
electronic thermal relay setting.
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Parameter