Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 340

14. USING A DIRECT DRIVE MOTOR
14.3.2 Input power supply circuit
CAUTION
Wire the power supply/main circuit so that the main circuit power supply is shut off and the servo-on command
turned off as soon as an alarm occurring, an enabled servo forced stop, or an enabled controller forced stop. 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.
When alarms are occurring in both axes of A and B, shut off the main circuit power
supply. Not doing so may cause a fire when a regenerative transistor malfunctions or
the like may overheat the regenerative resistor.
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.
Connecting a direct drive motor for different axis to the CNP3A or CNP3B connector
may cause a malfunction.
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
Therefore, the next axis servo amplifier displays "AA" at the indicator and turns into
base circuit shut-off. The direct drive motor stops with starting dynamic brake.
For details of the signals, refer to section 3.3.
Connect the servo amplifier power output (U, V, and W) to the direct drive motor
power input (U, V, and W) directly. Do not let a magnetic contactor, etc. intervene.
Otherwise, it may cause a malfunction.
Servo amplifier
U
V
W
Direct drive motor Servo amplifier
U
V
M
W
14 - 7
communication is interrupted.
Direct drive motor
U
U
V
V
W
W
M