Mitsubishi Electric FR-D720-008 Instruction Manual page 42

(1) When using the brake resistor (MRS type, MYS type) and high-duty brake resistor (FR-ABR)
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. (The brake resistor can not be connected to the
FR-D720-008 and 014, FR-D720S-008 and 014, FR-D710W-008 and 014.)
<Example 1>
MC
Power supply
*2
T
F
MC
OFF
ON
OCR
Contact
MC
∗1 Refer to the table below for the type number of each capacity of thermal relay and the diagram below for the connection.
∗2 When the power supply is 400V class, install a step-down transformer.
Power
Supply Brake Resistor
Voltage
MRS120W200
MRS120W100
100V, MRS120W60
200V MRS120W40
MYS220W50
(two units in parallel)
Power
High-duty
Supply
Brake Resistor
Voltage
FR-ABR-0.4K
FR-ABR-0.75K
100V, FR-ABR-2.2K
200V FR-ABR-3.7K
FR-ABR-5.5K
FR-ABR-7.5K
FR-ABR-H0.4K
FR-ABR-H0.75K
FR-ABR-H1.5K
400V FR-ABR-H2.2K
FR-ABR-H3.7K
FR-ABR-H5.5K
FR-ABR-H7.5K
NOTE
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 with a lead wire extended.
Do not connect a resistor directly to the DC terminals P/+ and N/-. This could cause a fire.
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-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
Connection of stand-alone option unit
<Example 2>
MC
Inverter
R/L1
Power supply
S/L2
T/L3
*2
T
F
B
MC
OFF
ON
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
P/+ terminal
2
31