MITSUBISHI ELECTRIC Merservo MR-J2S- B - Manual (Page 75)

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3. SIGNALS AND WIRING
3.12 Power line circuit of the MR-J2S-11KB to MR-J2S-22KB
CAUTION
Always connect a magnetic contactor (MC) between the main circuit power supply
and L1, L2, and L3 of the servo amplifier, and configure the wiring to be able to
shut down the power supply on the side of the servo amplifier’s power supply. If a
magnetic contactor (MC) is not connected, continuous flow of a large current may
cause a fire when the servo amplifier malfunctions.
Switch power off at detection of an alarm. Otherwise, a regenerative transistor fault
or the like may overheat the regenerative resistor, causing a fire.
During power-on, do not open or close the motor power line. Otherwise, a
malfunction or faulty may occur.
POINT
The power-on sequence is the same as in section 3.5.3.