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12. OPTIONS AND AUXILIARY EQUIPMENT
For the MR-RB50 MR-RB51 install the cooling fan as shown.
82.5 40 (1.58)
82.5133
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)]
(c) MR-J2S-11KB to MR-J2S-22KB (when using the supplied regenerative resistor)
When using the regenerative resistors supplied to the servo amplifier, the specified number of
resistors (4 or 5 resistors) must be connected in series. If they are connected in parallel or in less
than the specified number, the servo amplifier may become faulty and/or the regenerative resistors
burn. Install the resistors at intervals of about 70mm. Cooling the resistors with two cooling fans
(92
92, minimum air flow : 1.0m
3
) improves the regeneration capability. In this case, set "0E "
in parameter No. 2.
P
C
Cooling fan
5m or less
Do not remove
the short bar.
Servo amplifier
P
1
(Note) Series connection
Note. The number of resistors connected in series depends on the resistor type. Install a thermal sensor or like to configure a circuit that
will shut off the main circuit power at abnormal overheat. The supplied regenerative resistor does not have a built-in thermal
sensor. If the regenerative brake circuit fails, abnormal overheat of the resistor is expected to occur. On the customer side, please
also install a thermal sensor for the resistor and provide a protective circuit that will shut off the main circuit power supply at
abnormal overheat. The detection level of the thermal sensor changes depending on the resistor installation method. Please
install the thermal sensor in the optimum position according to the customer's design standards, or use our regenerative option
having built-in thermal sensor (MR-RB65, 66, 67).
Regenerative power [W]
Servo amplifier
Regenerative
resistor
Normal Cooling
Resistance
[
]
Number of
resistors
MR-J2S-11KB GRZG400-2 500 800 8 4
MR-J2S-15KB GRZG400-1 850 1300 5 5
MR-J2S-22KB GRZG400-0.8 850 1300 4 5