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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 type, MYS type) and high duty brake
resistor (FR-ABR) in case the regenerative brake transistor is damaged.
<Example 1>
MC
Power supply
*2
T
F
MC
OFF
ON
OCR
Contact
MC
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 stepdown transformer.
Power
Supply
Brake Resistor
Voltage
MRS120W200
MRS120W100
MRS120W60
200V
MRS120W40
MYS220W50
(two units in parallel)
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-H0.4K
FR-ABR-H0.75K
FR-ABR-H1.5K
FR-ABR-H2.2K
400V
FR-ABR-H3.7K
FR-ABR-H5.5K
FR-ABR-H7.5K
FR-ABR-H11K
FR-ABR-H15K
NOTE
The brake resistor connected should only be the dedicated brake resistor.
Brake resistor cannot 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 a resistor directly to terminals P/+ and N/-. This could cause a fire.
Parameters referred to
Pr. 30 Regenerative function selection
Thermal relay
High-duty brake
(OCR) (*1)
Inverter
resistor (FR-ABR)
R/L1
P/+
R
S/L2
T/L3
PR
Thermal Relay Type
(Mitsubishi product)
TH-N20CXHZ-0.7A
TH-N20CXHZ-1.3A
TH-N20CXHZ-2.1A
TH-N20CXHZ-3.6A
TH-N20CXHZ-5A
Thermal Relay Type
(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
TH-N20CXHZ-11A
TH-N20CXHZ-0.24A
TH-N20CXHZ-0.35A
TH-N20CXHZ-0.9A
TH-N20CXHZ-1.3A
TH-N20CXHZ-2.1A
TH-N20CXHZ-2.5A
TH-N20CXHZ-3.6A
TH-N20CXHZ-6.6A
TH-N20CXHZ-6.6A
Refer to page 131
Connection of stand-alone option unit
<Example 2>
MC
Inverter
R/L1
Power supply
S/L2
T/L3
*2
T
F
B
MC
ON
OFF
C
OCR
Contact
MC
Contact Rating
110VAC 5A,
220VAC 2A (AC11 class)
110VDC 0.5A,
220VDC 0.25A (DC11class)
Contact Rating
110VAC 5A,
220VAC 2A (AC11 class)
110VDC 0.5A,
220VDC 0.25A (DC11 class)
Thermal relay
High-duty brake
(OCR) (*1)
resistor (FR-ABR)
P/+
R
PR
1/L
5/L
1
3
TH-N20
2/T
6/T
1
3
To a resistor
To the inverter
terminal P/+
2
35
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