Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 527

[Appendix 1] Summary of MR-J4_B_-RJ020 + MR-J4-T20
(3) MR-J4-11KB-RJ020 to MR-J4-22KB-RJ020 and MR-J4-11KB4-RJ020 to MR-J4-22KB4-RJ020 (when
the regenerative resistor that comes standard with the servo amplifier is used.)
Note
When you use regenerative resistors that come standard with the servo amplifier, be sure to connect the
specified number (4 or 5 pcs.) in series. Parallel connection or use of regenerative resistors less than
the specified number could failure of the servo amplifier and/or burnout of regenerative resistors.
When regenerative resistors are installed side-by-side, keep a distance of 70 mm or more between
resistors. Cooling the resistors with cooling fans (1.0 ㎥/min or more, 92 mm square x 2 pcs.) enhances
regenerative power. In this case, set [Pr. 2] to "_ _ 0 E".
Servo amplifier
MR-J4-11KB-RJ020
MR-J4-15KB-RJ020
MR-J4-22KB-RJ020
MR-J4-11KB4-RJ020
MR-J4-15KB4-RJ020
MR-J4-22KB4-RJ020
Since the regenerative resistor that comes with the servo amplifier of 11 kW to 22
kW has no protective cover, be careful of the following items.
• The surface of the part is a resistor and it becomes very hot. Touching it could cause
burns.
• The capacitor of the servo amplifier is charged for a while even after power is
disconnected. Touching it may cause electric shock.
5 m or less
(Note) Series
connection
Cooling fan
Note. The number of series connections varies depending on the type of resistors. Thermal
sensors are not built into the supplied regenerative resistors. In the case of a failure
of the regenerative circuit, the possible cause is abnormal overheating of resistors.
Therefore, you should install thermal sensors near resistors and install the protection
circuit that shuts off the main circuit power in the case of abnormal overheating. The
detection level of the thermal sensor varies depending on the method used for
installing resistors. Install thermal sensors in optimal locations according to your
design standard or use regenerative options with built-in thermal sensors (MR-RB5E,
MR-RB5R, MR-RB9P, MR-RB9F, MR-RB9T, MR-RB5K-4, MR-RB6B-4, MR-RB60-4
or MR-RB6K-4) .
Regenerative resistor
GRZG400-0.8Ω
GRZG400-0.6Ω
GRZG400-0.5Ω
GRZG400-2.5Ω
GRZG400-2Ω
Appendix 1-64
Servo
amplifier
Regenerative power [W]
During normal
During cooling
use
500 800
850 1300
500 800
850 1300
Resistance
value
Number
[Ω]
3.2 4
3
5
2.5
10 4
10 5