Mitsubishi Electric Melservo MR-J3-A Instruction Manual page 298

12. OPTIONS AND AUXILIARY EQUIPMENT
(4) Connection of the regenerative option
The regenerative option will generate heat of about 100 . Fully examine heat dissipation, installation
position, used cables, etc. before installing the option. For wiring, use flame-resistant cables and keep them
clear of the regenerative option body. Always use twisted cables of max. 5m length for connection with the
servo amplifier.
(a) MR-J3-350A or less MR-J3-200A4 or less
Always remove the wiring from across P-D and fit the regenerative option across P-C.
The G3 and G4 terminals act as a thermal sensor. G3-G4 is disconnected when the regenerative option
overheats abnormally.
Servo amplifier
P
C
D
Note 1. When using the MR-RB50, MR-RB3M-4, MR-RB3G-4 or MR-RB5G-4, forcibly cool it with a cooling fan (1.0m
or so).
2. Make up a sequence which will switch off the magnetic contactor (MC) when abnormal heating occurs.
G3-G4 contact specifications
Maximum voltage: 120V AC/DC
Maximum current: 0.5A/4.8VDC
Maximum capacity: 2.4VA
For the MR-RB50, MR-RB3M-4, MR-RB3G-4 or MR-RB5G-4 install the cooling fan as shown.
Vertical
installation
POINT
When the MR-RB50 MR-RB51 MR-RB3M-4 MR-RB3G-4 MR-RB5G-4
MR-RB34-4 MR-RB54-4 is used, a cooling fan is required to cool it. The
cooling fan should be prepared by the customer.
For the sizes of wires used for wiring, refer to section 12.11.
Always remove the lead from across P-D.
Regenerative option
P
C
G3
(Note2)
G4
5m or less
Cooling fan (Note 1)
Top
Cooling fan
Bottom
Horizontal installation
Cooling fan installation screw hole dimensions
Terminal block
Thermal relay
Recommended fan:
Installation surface
12 - 25
[Unit : mm]
2-M3 screw hole
(for fan installation)
Depth 10 or less
(Screw hole already
82.5 40
Toyo Denki's TL396A or equivalent
3 /min, 92
machined)