Mitsubishi Electric MELSERVO MR-J4-B-LL Series Instruction Manual page 35

2. SIGNALS AND WIRING
Note 1. To prevent an electric shock, always connect the protective earth (PE) terminal (marked
protective earth (PE) of the cabinet.
2. Connect the diode in the correct direction. If it is connected reversely, the servo amplifier will malfunction and will not output
signals, disabling EM2 (Forced stop 2) and other protective circuits.
3. If the controller does not have forced stop function, always install the forced stop 2 switch (normally closed contact).
4. When starting operation, always turn on EM2 (Forced stop 2). (Normally closed contact)
5. Use SW1DNC MRC2-_. (Refer to section 6.1.)
6. Use SSCNET III cables listed in the following table.
7. The wiring after the second servo amplifier is omitted.
8. Up to 64 axes of servo amplifiers can be connected. The number of connectable axes depends on the controller you use.
Refer to section 4.3.1 of "MR-J4-_B_(-RJ) Servo Amplifier Instruction Manual" for setting of axis selection.
9. Make sure to cap the unused CN1B connector.
10. Supply 24 V DC ± 10% to interfaces from outside. The total current capacity of these power supplies must be 300 mA or lower.
300 mA is the value applicable when all I/O signals are used. The current capacity can be decreased by reducing the number
of I/O points. Refer to section 3.8.2 (1) of "MR-J4-_B_(-RJ) Servo Amplifier Instruction Manual" that gives the current value
necessary for the interface. 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.
11. ALM (Malfunction) is not assigned by default. Create a circuit that shuts off the main circuit by being interlocked with an alarm
detected by the controller. When assigning ALM (Malfunction) to the CN3-9 pin, set [Pr. PD08] to "0003". ALM (Malfunction)
turns on in normal alarm-free condition. (Normally closed contact)
12. The pins with the same signal name are connected in the servo amplifier.
13. You can change devices of these pins with [Pr. PD07] and [Pr. PD08].
14. Configure a circuit to turn off EM2 when the main circuit power is turned off to prevent an unexpected restart of the servo
amplifier.
15. When not using the STO function, attach the short-circuit connector came with a servo amplifier.
Cable
Standard cord inside
MR-J3BUS_M
cabinet
Standard cable
MR-J3BUS_M-A
outside cabinet
Long-distance cable MR-J3BUS_M-B
2 - 4
) of the servo amplifier to the
Cable model Cable length
0.15 m to 3 m
5 m to 20 m
30 m to 50 m