Mitsubishi Electric MELSERVO MR-J4-B-LL Series Instruction Manual page 5

(2) Wiring
Wire the equipment correctly and securely. Otherwise, the servo motor may operate unexpectedly.
Do not install a power capacitor, surge killer, or radio noise filter (optional FR-BIF(-H)) on the servo
amplifier output side.
To avoid a malfunction, connect the wires to the correct phase terminals (U, V, and W) of the servo
amplifier and servo motor.
Connect the servo amplifier power outputs (U, V, and W) to the servo motor power inputs (U, V, and W)
directly. Do not connect a magnetic contactor and others between them. Otherwise, it may cause a
malfunction.
Servo amplifier
The connection diagrams in this Instruction Manual are shown for sink interfaces, unless stated
otherwise.
The surge absorbing diode installed to the DC relay for control output should be fitted in the specified
direction. Otherwise, the servo amplifier will malfunction and will not output signals, disabling the
emergency stop and other protective circuits.
When the wires are not tightened enough to the terminal block, the wires or terminal block may generate
heat because of the poor contact. Be sure to tighten the wires with specified torque.
Connecting a servo motor of the wrong axis to U, V, W, or CN2 of the servo amplifier may cause a
malfunction.
Configure a circuit to turn off EM2 or EM1 when the main circuit power is turned off to prevent an
unexpected restart of the servo amplifier.
(3) Test run and adjustment
Before operation, check and adjust the parameter settings. Improper settings may cause some machines
to operate unexpectedly.
Never make a drastic adjustment or change to the parameter values as doing so will make the operation
unstable.
Do not get close to moving parts during the servo-on status.
CAUTION
Servo motor
U
U
V
V
M
W
W
Servo amplifier
24 V DC
DOCOM
Control output
RA
signal
For sink output interface
CAUTION
Servo amplifier
U
V
W
Servo amplifier
DOCOM
Control output
signal
For source output interface
A - 4
Servo motor
U
V
M
W
24 V DC
RA