Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 525

[Appendix 1] Summary of MR-J4_B_-RJ020 + MR-J4-T20
13.5.4 Connecting regenerative options
Regenerative options may be heated to 100 °C or more above the ambient temperature. Carefully determine
the position of the radiation, installation position, wiring path, etc. Use flame-retardant wire for wiring or apply
flame retardant treatment by avoiding contact between the wires and the regenerative option. Be sure to use
twisted wires when connecting to the servo amplifier and keep the wiring distance to no longer than 5 m.
(1) MR-J4-500B-RJ020 or less / MR-J4-350B4-RJ020 or less
Be sure to remove wiring between P+and D and then install the regenerative option between P+ and C.
The G3 and the G4 terminals are thermal sensors. Abnormal overheating of the regenerative option
causes the contact between G3 and G4 to open.
POINT
When using MR-RB50, MR-RB51, MR-RB3M-4, MR-RB3G-4, MR-RB5G-4, MR-
RB34-4, MR-RB54-4, MR-RB3H-4 and MR-RB5H-4, cooling using the cooling
fan is required. You should provide the cooling fan.
Refer to Chapter 7 of this document for wire sizes used for wiring.
Make sure to remove the wiring between P+ and D.
Servo amplifier
P+
C
D
5 m or lower
Note 1. When using MR-RB50, MR-RB3M-4, MR-RB3G-4, MRRB5G-4, MR-RB3H-4 and
MR-RB5H-4, perform forced cooling using the cooling fan (1.0 m
mm square).
2. Provide forced cooling for MR-RB30, MR-RB31 and MR-RB32 using the cooling
fan (1.0 ㎥/min or more, 92 mm square) when the ambient temperature of the
regenerative option is 55 °C and regenerative load ratio exceeds 60%. When the
ambient temperature is at or below 35 °C, the cooling fan is not required. (In the
figure below, it is necessary to cool with the cooling fan required when the
ambient temperature and load ratio are within the shaded area.)
100
60
Cooling fan is not
needed
0
0
Ambient temperature [°C]
3. Configure sequence of shutting off the electromagnetic contactor when abnormal
heating is caused.
Specifications for contact between G3 and G4:
Maximum voltage: 120 V AC/DC
Maximum current: 0.5 A/4.8 V DC
Maximum capacity: 2.4 VA
Appendix 1-62
Regenerative option
P
C
G3
(Note 3)
G4
(Note 1, 2)
Cooling fan
Cooling fan is needed
35 55
/min or more, 92
3