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3. SIGNALS AND WIRING
3 - 11
(2) MR-J4-500B4(-RJ)/MR-J4-700B4(-RJ)
(Note 5)
(Note 4)
Malfunction
(Note 5) Forced stop 2
C
P+
L11
L21
P3
P4
N-
(Note 1)
(Note 7)
MC
L1
L2
L3
U
V
W
(Note 2)
U
V
W
M
Motor
CN2
(Note 6)
(Note 4)
Malfunction
RA1
OFF
MC
ON
MC
SK
CN8
MCCB
(Note 10)
(Note 11)
(Note 11)
ALM
DOCOM
CN3
RA1
CN3
EM2
DICOM
24 V DC (Note 13)
24 V DC (Note 13)
(Note 12)
Step-down
transformer
3-phase
380 V AC to
480 V AC
Emergency stop switch
Servo amplifier Servo motor
Built-in
regenerative
resistor
(Note 3)
Encoder cable
Encoder
(Note 8)
Main circuit power supply
(Note 9)
Short-circuit connector
(Packed with the servo amplifier)
Note 1. Between P3 and P4 is connected by default. When using the power factor improving DC reactor, remove the short bar
between P3 and P4. Refer to section 11.11 for details. Additionally, a power factor improving DC reactor and power factor
improving AC reactor cannot be used simultaneously.
2. When using the regenerative option, refer to section 11.2.
3. For the encoder cable, use of the option cable is recommended. For selecting cables, refer to "Servo Motor Instruction
Manual (Vol. 3)".
4. If disabling ALM (Malfunction) output with the parameter, configure up the power supply circuit which switches off the
magnetic contactor after detection of alarm occurrence on the controller side.
5. This diagram is for sink I/O interface. For source I/O interface, refer to section 3.8.3.
6. For connecting servo motor power wires, refer to "Servo Motor Instruction Manual (Vol. 3)".
7. Use a magnetic contactor with an operation delay time (interval between current being applied to the coil until closure of
contacts) of 80 ms or less. Depending on the main circuit voltage and operation pattern, bus voltage decreases, and that
may cause the forced stop deceleration to shift to the dynamic brake deceleration. When dynamic brake deceleration is not
required, slow the time to turn off the magnetic contactor.
8. Configure a circuit to turn off EM2 when the main circuit power is turned off to prevent an unexpected restart of the servo
amplifier.
9. When not using the STO function, attach the short-circuit connector came with a servo amplifier.
10. When wires used for L11 and L21 are thinner than wires used for L1, L2, and L3, use a molded-case circuit breaker. (Refer
to section 11.10.)
11. Connecting a servo motor for different axis to U, V, W, or CN2 of the servo amplifier may cause a malfunction.
12. Stepdown transformer is required when the coil voltage of the magnetic contactor is 200 V class.
13. The illustration of the 24 V DC power supply is divided between input signal and output signal for convenience. However,
they can be configured by one.