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13. OPTIONS AND AUXILIARY EQUIPMENT
(4) Connection of the regenerative option
POINT
When the MR-RB50 MR-RB51 is used, a cooling fan is required to cool it.
The cooling fan should be prepared by the customer.
The regenerative option will cause a temperature rise of 100 relative to the ambient temperature.
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 (16.4ft) length for connection with the servo amplifier.
(a) MR-J2S-350A 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 opened when the regenerative option
overheats abnormally.
Servo amplifier
Regenerative option
Always remove the lead from across P-D.
D
P
C
G4
G3
(Note 2)
5m (16.4 ft) or less
Cooling fan(Note 1)
C
P
Note 1. When using the MR-RB50, forcibly cool it with a cooling fan (92 92, minimum air flow: 1.0m
3
).
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 install the cooling fan as shown.
82.5 40 (1.58)
82.5
133
Cooling fan installation screw hole dimensions
2-M3 screw hole
(for cooling fan installation)
Depth 10 or less
(Screw hole already
machined)
Cooling fan Terminal block
Thermal relay
Installation surface
Horizontal installation
Vertical
installation
Top
Bottom
(3.25)
(5.24)
(3.25)
[Unit : mm(in)]