sh030051g.pdf - 第232页
11 - 27 11. OPTIONS AND AUXILI ARY EQUIPMENT The drawing below shows the MR-J3-350B4 MR-J3-500B(4). Refer to sect ion 9.1 (6) outline drawings for the position of the fixing screw for MR-J3-700B(4). Built-in regenerative…
11 - 26
11. OPTIONS AND AUXILIARY EQUIPMENT
(b) MR-J3-350B4
MR-J3-500B(4) MR-J3-700B(4)
Always remove the wiring (across P-C) of the servo amplifier built-in regenerative resistor and fit the
regenerative option across P-C.
The G3 and G4 terminals act as a thermal sensor. G3-G4 is opened when the regenerative option
overheats abnormally.
Regenerative optionServo amplifier
Cooling fan(Note 1)
P
C
G4
G3
C
P
Always remove wiring (across P-C) of servo
amplifier built-in regenerative resistor.
5m or less
(Note 2)
Note 1. When using the MR-RB51 MR-RB3G-4 MR-RB5G-4 MR-RB34-4 MR-RB54-4, forcibly
cool it with a cooling fan (92
92, minimum air flow : 1.0m
3
).
2. Make up a sequence which will switch off the magnetic contactor (MC) when abnormal heating
occurs.
G3-G4 contact specifications
Maximum voltage: 120V AC/DC
Maximum current: 0.5A/4.8VDC
Maximum capacity: 2.4VA
When using the regenerative resistor option, remove the servo amplifier's built-in regenerative resistor
terminals (across P-C), fit them back to back, and secure them to the frame with the accessory screw as
shown below.
Mounting method
Accessory screw
11 - 27
11. OPTIONS AND AUXILIARY EQUIPMENT
The drawing below shows the MR-J3-350B4
MR-J3-500B(4). Refer to section 9.1 (6) outline drawings
for the position of the fixing screw for MR-J3-700B(4).
Built-in regenerative resistor
lead terminal fixing screw
For the MR-RB51, MR-RB3G-4, MR-RB5G-4, MR-RB34-4 or MR-RB54-4 install the cooling fan as
shown.
(for cooling fan installation)
Depth 10 or less
(Screw hole already
machined)
Cooling fan installation screw hole dimensions
82.5
40
82.5
133
2-M3 screw hole
Terminal block
Thermal relay
Installation surface
Horizontal installation
Vertical
installation
Top
Bottom
[Unit : mm]
Cooling fan
11 - 28
11. OPTIONS AND AUXILIARY EQUIPMENT
(c) MR-J3-11KB(4) to MR-J3-22KB(4) (when using the supplied regenerative resistor)
CAUTION
The regenerative resistor supplied with 11 kW to 22 kW servo amplifiers does not
have a protect 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.
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 " FA" in parameter No.PA02.
Coolin
g
fan
P
C
Servo amplifie
r
(Note) Series connection
P
1
Do not remove
the short bar.
5m or less
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) provided by Mitsubishi Electric Corporation.
Servo amplifier
Regenerative
resistor
Regenerative power [W]
Resistance
[
]
Number of
resistors
Normal Cooling
MR-J3-11KB GRZG400-1.5 500 800 6 4
MR-J3-15KB GRZG400-0.9 850 1300 4.5 5
MR-J3-22KB GRZG400-0.6 850 1300 3 5
MR-J3-11KB4 GRZG400-5.0 500 800 20 4
MR-J3-15KB4 GRZG400-2.5 850 1300 12.5 5
MR-J3-22KB4 GRZG400-2.0 850 1300 10 5