Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 170

Part 5: Review on Replacement of MR-J2S-30 kW or Higher Capacity Models with MR-J4-DU_
When the drive unit sends the converter unit a start up command, the converter unit shorts CNP1-2 and
L21, powering the control circuit of the magnetic contactor. This turns on the magnetic contactor and
powers up the main circuit of the converter unit.
In the following cases, the converter unit releases CNP1-2 and L21 and powers down the main circuit
automatically.
(a) When the converter unit activates an alarm.
(b) When the drive unit activates an alarm.
(c) When the forced stop of the converter (EM1) unit is turned off.
(d) When the drive unit outputs [AL. 95 STO warning].
(2) When the magnetic contactor drive output is disabled
Activating an alarm of the converter unit or drive unit does not shut off the main circuit power supply.
Configure the circuit so that an alarm can be detected and the main circuit power supply can be shut off.
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