Mitsubishi Electric MR-J2S-A Instruction Manual page 235

13. OPTIONS AND AUXILIARY EQUIPMENT
For the MR-RB50 MR-RB51 install the cooling fan as shown.
Top
Cooling fan
Bottom
Vertical
installation
(c) MR-J2S-11KA to MR-J2S-22KA (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
in parameter No. 0.
5m or less
Do not remove
the short bar.
(Note) Series connection
Cooling fan
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
Servo Amplifier
Resistor
MR-J2S-11KA GRZG400-2
MR-J2S-15KA GRZG400-1
MR-J2S-22KA GRZG400-0.8
Terminal block
Installation surface
Horizontal installation
) improves the regeneration capability. In this case, set "0E
3
Servo amplifier
P
1
P
C
Regenerative Power [W]
Normal Cooling
500 800
850 1300
850 1300
13 - 6
WWW.NNC.IR
Cooling fan installation screw hole dimensions
Thermal relay
82.5
(3.25)
Resistance Number of
[ ] Resistors
8 4
5 5
4 5
[Unit : mm(in)]
2-M3 screw hole
(for cooling fan installation)
Depth 10 or less
(Screw hole already
machined)
40 (1.58)
"