MITSUBISHI ELECTRIC MELSERVO MR-J2S- A - Manual (Page 231)

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13. OPTIONS AND AUXILIARY EQUIPMENT
For the MR-RB50 MR-RB51 install the cooling fan as shown.
82.5 40 (1.58)
82
.5
13
3
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)]
(c) MR-J2S-11KA to MR-J2S-22KA (when using the supplied regenerative brake resistor)
When using the regenerative brake 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 brake
resistors burn. Install the resistors at intervals of about 70mm. Cooling the resistors with fans
(1.0m
3 /min, 92 (about two fans) improves the regeneration capability. In this case, set "0E " in
parameter No. 0.
P
C
Servo amplifier
(Note) Series connection
Fan
P 1
Do not remove
the short bar.
5m or less
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 brake 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 brake option having built-in thermal sensor (MR-RB65, 66, 67).
Regenerative Power [W]
Servo Amplifier
Regenerative
Brake Resistor Normal Cooling
Resistance
[ ]
Number of
Resistors
MR-J2S-11KA GRZG400-2 500 800 8 4
MR-J2S-15KA GRZG400-1 850 1300 5 5
MR-J2S-22KA GRZG400-0.8 850 1300 4 5