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Connection of a dedicated external brake resistor (MRS type, MYS type, FR-ABR)
2.4 Connection of a dedicated external brake resistor (MRS type,
MYS type, FR-ABR)
Install a dedicated brake resistor (MRS type, MYS type, FR-ABR) outside when the motor driven by the inverter is made to run
by the load, quick deceleration is required, etc. Connect a dedicated brake resistor (MRS type, MYS type, FR-ABR) to
terminals P/+ and PR. (For the locations of terminals P/+ and PR, refer to the terminal block layout (page 12).)
Set parameters below. (
Refer to the Instruction Manual (Applied) for the parameter details.)
It is recommended to configure a sequence, which shuts off power in the input side of the inverter by the external thermal
relay as shown below, to prevent overheat and burnout of the brake resistor (MRS, MYS) and high duty brake resistor (FR-
ABR) in case the regenerative brake transistor is damaged. (The brake resistor can not be connected to the 0.1K or 0.2K.)
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 higher.)
When the power supply is 400V class, install a step-down transformer.
Connected Brake Resistor Pr. 30 Regenerative function selection Setting Pr. 70 Special regenerative brake duty Setting
MRS type, MYS type 0 (initial value) —
MYS type
(used at 100% torque/6%ED)
16%
FR-ABR 1
7.5K or lower 10%
11K or higher 6%
Power Supply
Voltage
Brake Resistor
Thermal Relay Type
(Mitsubishi product)
Contact Rating
200V
MRS120W200 TH-N20CXHZ-0.7A
110VAC 5A,
220VAC 2A (AC11 class)
110VDC 0.5A,
220VDC 0.25A (DC11 class)
MRS120W100 TH-N20CXHZ-1.3A
MRS120W60 TH-N20CXHZ-2.1A
MRS120W40 TH-N20CXHZ-3.6A
MYS220W50 (two
units in parallel)
TH-N20CXHZ-5A
Power Supply
Voltage
Brake Resistor
Thermal Relay Type
(Mitsubishi product)
Contact Rating
200V
FR-ABR-0.4K TH-N20CXHZ-0.7A
110VAC 5A
220VAC 2A (AC11 class)
110VDC 0.5A,
220VDC 0.25A (DC11 class)
FR-ABR-0.75K TH-N20CXHZ-1.3A
FR-ABR-2.2K TH-N20CXHZ-2.1A
FR-ABR-3.7K TH-N20CXHZ-3.6A
FR-ABR-5.5K TH-N20CXHZ-5A
FR-ABR-7.5K TH-N20CXHZ-6.6A
FR-ABR-11K TH-N20CXHZ-11A
FR-ABR-15K TH-N20CXHZ-11A
400V
FR-ABR-H0.4K TH-N20CXHZ-0.24A
FR-ABR-H0.75K TH-N20CXHZ-0.35A
FR-ABR-H1.5K TH-N20CXHZ-0.9A
FR-ABR-H2.2K TH-N20CXHZ-1.3A
FR-ABR-H3.7K TH-N20CXHZ-2.1A
FR-ABR-H5.5K TH-N20CXHZ-2.5A
FR-ABR-H7.5K TH-N20CXHZ-3.6A
FR-ABR-H11K TH-N20CXHZ-6.6A
FR-ABR-H15K TH-N20CXHZ-6.6A
Note
The brake resistor connected should only be the dedicated brake resistor.
Perform wiring and operation according to the Instruction Manual of each option unit.
Brake resistor can not be used with the brake unit, high power factor converter, power supply regeneration converter,
etc.
Do not use the brake resistor (MRS type, MYS type) with a lead wire extended.
Do not connect the resistor directly to the terminals P/+ and N/-. This could cause a fire.
MC
Inverter
MC
R
PR
P/+
S/L2
T/L3
R/L1
ON
OFF
OCR
Contact
Power supply
F
<Example 1>
High-duty brake
resistor (FR-ABR)
T
MC
Thermal relay
(OCR) (*1)
*2
Inverter
MC
R
PR
P/+
S/L2
T/L3
R/L1
ON
OFF
B
C
Power supply
F
<Example 2>
MC
High-duty brake
resistor (FR-ABR)
OCR
Contact
T
MC
Thermal relay
(OCR) (*1)
*2
To the inverter
terminal P/+
To a resisto
r
TH-N20
1/L1 5/L3
2/T1 6/T3