Mitsubishi Electric fr-e700 series, Instruction Manual

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Selection and protection of a motor Parameter
6 - 84
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 deteriorated. In this
case, use an external thermal relay.
A special motor cannot be protected by the electronic thermal relay function. Use the external
thermal relay.
The operation time of the transistor protection thermal relay shortens when the Pr. 72 "PWM fre-
quency selection" setting increases.
Electronic thermal relay does not work when 5% or less of inverter rated current is set to electronic
thermal relay setting.