Input Power Supply Circuit - Mitsubishi Electric MELSERVO-J3W Series Instruction Manual

3. SIGNALS AND WIRING

3.1 Input power supply circuit

CAUTION
Wire the power supply/main circuit as shown below so that power is shut off and the servo-on command turned
off as soon as an alarm occurs, a servo forced stop is made valid, or a controller forced stop is made valid. A
molded-case circuit breaker (MCCB) must be used with the input cables of the main circuit power supply.
Always connect a magnetic contactor between the power supply and the main circuit
power supply (L1, L2, and L3) of the servo amplifier, in order to configure a circuit
that shuts down the power supply on the side of the servo amplifier's power supply. If
a magnetic contactor is not connected, continuous flow of a large current may cause
a fire when the servo amplifier malfunctions.
Shut off the main circuit power supply when alarms are occurring in both of the A-
axis and the B-axis. Otherwise, a regenerative transistor fault or the like may
overheat the regenerative resistor, causing a fire.
Check the servo amplifier model, and then input proper voltage to the servo amplifier
power supply. If input voltage exceeds the upper limit, the servo amplifier will break
down.
POINT
Even if alarm has occurred, do not switch off the control circuit power supply.
When the control circuit power supply has been switched off, optical module does
not operate, and optical transmission of SSCNET communication is interrupted.
Therefore, the servo amplifier on the rear axis displays "AA" at the indicator and
turns into base circuit shut-off. The servo amplifier stops with starting dynamic
brake.
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