Mitsubishi Electric FR-E720-600 Instruction Manual page 41

Connection of stand-alone option unit
(1) When using the brake resistor (MRS, MYS) 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, 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 FR-E720-008
or 015.)
<Example 1>
Power supply
*2
T
F
ON
OFF
MC
MC
∗1 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 FR-E720-470 or more)
∗2 When the power supply is 400V class, install a step-down 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
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.
30
Thermal relay
High-duty brake
(OCR) (*1)
MC
Inverter
resistor (FR-ABR)
R/L1 P/+
S/L2
T/L3 PR
OCR
Contact
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
<Example 2>
R
Power supply
*2
T
F
OFF ON
MC
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)
MC
Inverter resistor (FR-ABR)
R/L1 P/+
S/L2
T/L3 PR
B
C
OCR
Contact
1/L
1
2/T
1
To the inverter
P/+ terminal
R
5/L
3
TH-N20
6/T
3
To a resistor