Mitsubishi Electric FR-A700 Technical Manual page 503

(2) External high-duty brake resistor (FR-ABR
type)
1) Installation position
(a) When the
A700
excess of the duty of the built-in brake
resistor, disconnect the built-in brake resistor
supplied with the inverter and install an
external brake resistor.
For the
A700
0.4K or more, an external brake
D700
resistor can be installed.
(b) Since the external brake resistor generates
much heat, its surface temperature may
exceed 360
the resistor at high-duty. Hence, install the
external brake resistor in consideration of heat
dissipation. The inverter and other devices
must not be placed above the resistor.
External brake
resistor
Heat resistant
cables
Example of installing an external brake
resistor on top of the enclosure
2) Wiring
(a) When wiring the brake resistor, note high DC
voltage application and resistor-generated
heat.
(b) The wiring distance between the inverter and
brake resistor should be as short as possible.
If it exceeds 2m, twist the cables. (If twisted,
the distance must not exceed 5m)
P
Inverter
Disconnect
PX
a jumper
PR
Within 2m
P
Inverter
PX
Disconnect
PR
a jumper
Wiring the brake resistor
* Since the series 11K or more,
A700
series inverter is not provided with the PX terminal, a
jumper is not need to be removed.
(c) When wiring the brake resistor, the resistor-
generated heat
temperature is approximately 360
taken into consideration.
• Take measures to prevent the cables
from making contact with the resistor.
7.5K or less is operated in
22K or less and
E700
in an operation pattern using
Cooling fan
Install a cover
which ensures proper
heat dissipation
Brake
resistor
*
Twist
Brake
resistor
*
Within 5m
E700 D700
(maximum surface
) must be
• Use heat-resistant cables (such as
glass-braided cables),
cables with silicone tubes. Use cables
of 2mm
(d) The following sequence is recommended to
prevent overheat and burnout of the brake
resistor in case the brake transistor is
damaged.
<Example 1>
Power
Supply
F
OFF ON
MC
<Example 2>
Power
Supply
F
OFF
Removing jumpers disables the built-in brake
resistor (power is not supplied). Note that the
built-in brake resistor is not need to be
removed from the inverter. The lead wire of
the built-in brake resistor is not need to be
removed from the terminal.
*1 Remove the jumper connected across terminal PR-PX of
the inverter. Since the
series inverter is not provided with the
E700 D700
PX terminal, a jumper is not need to be removed.
*2 Refer to the table below for the type number of each
capacity of thermal relay and the diagram below for the
connection. (Always install a thermal relay when using a
brake resistor whose capacity is 11K or more.)
Power
High-duty
Supply
Brake Resistor
Voltage
FR-ABR-0.4K
FR-ABR-0.75K
FR-ABR-2.2K
FR-ABR-3.7K
200V FR-ABR-5.5K
FR-ABR-7.5K
FR-ABR-11K
FR-ABR-15K
FR-ABR-22K
FR-ABR-H0.4K
FR-ABR-H0.75K TH-N20CXHZ-0.35A
FR-ABR-H1.5K
FR-ABR-H2.2K
FR-ABR-H3.7K
400V
FR-ABR-H5.5K
FR-ABR-H7.5K
FR-ABR-H11K
FR-ABR-H15K
FR-ABR-H22K
1/L
2/T
To the inverter
P/+ terminal
537
SELECTION
or cover the
2
or larger size.
Thermal
brake resistor
relay
(OCR)(*2)
Inverter
MC
R/L1 P/+
S/L2 PX
PR
T/L3
Disconnect jumper. (*1)
M
C
OCR
Contact
Thermal
relay brake resistor
Inverter (OCR)(*2)
MC
R/L1 P/+
S/L2 PX
T/L3
PR
T
Disconnect jumper. (*1)
B
ON
M
C
C
OCR
Contact
MC
series 11K or more,
A700
Thermal Relay Type
Contact Rating
(Mitsubishi Product)
TH-N20CXHZ-0.7A
TH-N20CXHZ-1.3A
TH-N20CXHZ-2.1A
TH-N20CXHZ-3.6A
TH-N20CXHZ-5A
TH-N20CXHZ-6.6A
TH-N20CXHZ-11A
110VAC 5A,
TH-N20CXHZ-11A
220VAC 2A
TH-N60-22A
(class 11AC )
TH-N20CXHZ-0.24A
110VDC 0.5A,
220VDC 0.25A
TH-N20CXHZ-0.9A
(class 11DC)
TH-N20CXHZ-1.3A
TH-N20CXHZ-2.1A
TH-N20CXHZ-2.5A
TH-N20CXHZ-3.6A
TH-N20CXHZ-6.6A
TH-N20CXHZ-6.6A
TH-N20-9A
5/L
1 3
TH-N20
6/T
1 3
To the ABR
High-duty
(FR-ABR)
R
High-duty
(FR-ABR)
R
3