Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 445

14. OPTIONS AND AUXILIARY EQUIPMENT
(c) MR-J3-11KT(4)(-LR) MR-J3-15KT(4)(-LR) MR-J3-22KT(4) (when using the supplied regenerative
resistor)
CAUTION
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 "
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. The thermal sensor is not mounted on the
attached regenerative resistor. An abnormal heating of resistor may be generated at a regenerative circuit failure. Install a
thermal sensor near the resistor and establish a protective circuit to shut off the main circuit power supply when abnormal
heating occurs. The detection level of the thermal sensor varies according to the settings of the resistor. Set the thermal
sensor in the most appropriate position on your design basis or use the thermal sensor built-in regenerative option (MR-
RB5E, 9P, 9F, 6B-4, 60-4 and 6K-4).
Servo amplifier
MR-J3-11KT
GRZG400-1.5
MR-J3-11KT-LR
GRZG400-0.8
MR-J3-15KT
GRZG400-0.9
MR-J3-15KT-LR
GRZG400-0.6
MR-J3-22KT
MR-J3-11KT4
GRZG400-5.0
MR-J3-11KT4-LR GRZG400-2.5
MR-J3-15KT4
GRZG400-2.5
MR-J3-15KT4-LR
GRZG400-2.0
MR-J3-22KT4
The regenerative resistor supplied with 11kW to 22kW servo amplifiers does not
have a protective cover. Touching the resistor (including wiring/screw hole area)
may cause a burn injury and electric shock. Even if the power was shut-off, be
careful until the bus voltage discharged and the temperature decreased because of
the following reasons.
It may cause a burn injury due to very high temperature without cooling.
It may cause an electric shock due to charged capacitor of the servo amplifier.
Servo amplifier
P
1
P
C
Regenerative power [W]
Regenerative
resistor
Normal
500
500
850
850
500
500
850
850
Resistance
[ ]
Cooling
800 6
800 3.2
1300 4.5
1300 3
800 20
800 10
1300 12.5
1300 10
14 - 36
FA" in parameter No.PA02.
Number of
resistors
4
4
5
5
4
4
5
5