Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 346

MR-J4-11KGF(-RJ) to MR-J4-22KGF(-RJ)/MR-J4-11KGF4(-RJ) to MR-J4-22KGF4(-RJ)
(when using the supplied regenerative resistor)
CAUTION
• The regenerative resistor supplied with 11 kW to 22 kW 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.
 It may cause an electric shock due to charged capacitor of the servo amplifier.
• Do not use servo amplifiers with external regenerative resistors other than the combinations specified below. Otherwise, it may cause a fire.
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 70 mm. Cooling the resistors with two cooling fans (1.0 m
mm) improves the regeneration capability. In this case, set "_ _ F A" in [Pr. PA02].
5 m or less
Series connection
*1
Cooling fan
*1 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 the
design basis of the device, or use the thermal sensor built-in regenerative option. (MR-RB5R, MR-RB9F, MR-RB9T, MR-RB5K-4, or
MR-RB6K-4)
Servo amplifier
MR-J4-11KGF(-RJ)
MR-J4-15KGF(-RJ)
MR-J4-22KGF(-RJ)
MR-J4-11KGF4(-RJ)
MR-J4-15KGF4(-RJ)
MR-J4-22KGF4(-RJ)
*1 The following shows an indication example of symbol.
GR400 R80K
11 OPTIONS AND PERIPHERAL EQUIPMENT
344
11.2 Regenerative options
Servo amplifier
P+
C
Regenerative Symbol
resistor
GRZG400-0.8 GR400 R80K
GRZG400-0.6 GR400 R60K
GRZG400-0.5 GR400 R50K
GRZG400-2.5 GR400 2R5K
GRZG400-2 GR400 2R0K
Symbol
Regenerative resistor
*1
Regenerative power [W]
Normal
500
850
500
850
3
/min or more, 92 mm  92
Resultant
resistance []
Cooling
800 3.2
1300 3
2.5
800 10
1300 10
Number of
resistors
4
5
4
5