Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 128

 Handling of the manual contactor on the inverter's output side
A PM motor is a synchronous motor with high-performance magnets embedded inside. High-voltage is generated at the motor
terminals while the motor is running even after the inverter power is turned OFF. In an application where the PM motor is driven
by the load even after the inverter is powered OFF, a low-voltage manual contactor must be connected at the inverter's output
side.
NOTE
• Before wiring or inspection for a PM motor, confirm that the PM motor is stopped. In an application, such as fan and blower,
where the motor is driven by the load, a low-voltage manual contactor must be connected at the inverter's output side, and
wiring and inspection must be performed while the contactor is open. Otherwise you may get an electric shock.
• Do not open or close the contactor while the inverter is running (outputting).
3. PRECAUTIONS FOR USE OF THE INVERTER
3.4 Power shutdown and magnetic contactor (MC)
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