Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 6

(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 (FR-BIF-(H) option) between the servo
motor and servo amplifier.
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 let a magnetic contactor, etc. intervene. Otherwise, a malfunction or fault may occur.
Servo amplifier
Do not connect AC power directly to the servo motor. Otherwise, a fault may occur.
The connection diagrams in this Instruction Manual are shown for sink interfaces, unless stated otherwise.
The surge absorbing diode installed on the DC output signal relay of the servo amplifier must be wired in
the specified direction. Otherwise, the servo amplifier will malfunction and will not output signals, disabling
the emergency stop and other protective circuits.
Servo amplifier
Control output
signal
For sink output
interface
When the cable is not tightened enough to the terminal block (connector), the cable or terminal block
(connector) may generate heat because of the poor contact. Be sure to tighten the cable with specified
torque.
(3) Test run adjustment
Before operation, check the parameter settings. Improper settings may cause some machines to perform
unexpected operation.
The parameter settings must not be changed excessively. Operation will be unstable.
Servo motor
U
U
V
V
W
W
24VDC
DOCOM
RA
DICOM
CAUTION
Servo amplifier
U
M V
W
Servo amplifier
DOCOM
Control output
signal
DICOM
For source output
interface
CAUTION
A - 5
Servo motor
U
V
M
W
24VDC
RA