Instruction manual

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12. OPTIONS AND AUXILIARY EQUIPMENT
(4) Connection of the regenerative brake option
POINT
When the MR-RB50 MR-RB51 is used, a 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 12.8.
The regenerative brake 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 brake option body. Always use twisted cables of max. 5m(16.4ft) length for
connection with the servo amplifier.
(a) MR-J3-350A or less
Always remove the wiring from across P-D and fit the regenerative brake option across P-C.
The G3 and G4 terminals act as a thermal sensor. G3-G4 are disconnected when the regenerative
brake option overheats abnormally.
D
P
C
G4
G3
C
P
Servo amplifier
Regenerative brake option
(Note2)
5m (16.4 ft) max.
Always remove the lead from across P-D.
Fan (Note 1)
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
Note 1. When using the MR-RB50, forcibly cool it with a cooling fan (1.0m
3
/min, 92 or so).
2.
For the MR-RB50 install the cooling fan as shown.
82.5 40 (1.58)
82.5133
Fan installation screw hole dimensions
2-M3 screw hole
(for fan installation)
Depth 10 or less
(Screw hole already
machined)
Recommended fan:
Toyo Denki's TL396A or equivalent
Fan Terminal block
Thermal relay
Installation surface
Horizontal installation
Vertical
installation
Top
Bottom
(3.25)
(5.24)
(3.25)
[Unit : mm(in)]