Mitsubishi Electric FR-E700 Instruction Manual page 77

Wiring
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 high duty brake
resistor (FR-ABR) in case the regenerative brake transistor is damaged. (The brake resistor can not be
connected to the FR-E720S-008SC and 015SC.)
Example 1
Power
supply
Fig. 3-35: Protection circuits
Refer to Tab. 3-21 for the type number of each capacity of thermal relay and the diagram for the
connection.
When the power supply is 400 V class, install a step-down transformer.
Power Supply
Voltage
230 V
400 V
Tab. 3-21: Resistor and thermal relay combination
To the inverter P/+
CAUTION:
E
● Brake resistor can not be used with the brake unit (FR-BU2), high power factor converter
(FR-HC), power supply regeneration converter (FR-CV), etc.
● Do not connect a resistor directly to the DC terminals P/+ and N/–. This could cause a fire.
FR-E700 SC EC/ENE
Inverter
Thermo relay
(OCR)
T
ON OFF
OCR
contact
High-duty
Type
Brake Resistor
FR-ABR-0.4K
FR-ABR-0.75K
FR-ABR-2.2K
FR-ABR-H0.4K
FR-ABR-H0.75K
FR-ABR-H1.5K
FR-ABR-H2.2K
FR-ABR-H3.7K
FR-ABR-H5.5K
FR-ABR-H7.5K
FR-ABR-H11K
FR-ABR-H15K
terminal
Connection of stand-alone option units
Example 2
Brake
resistor
Power
supply
ON
Thermal Relay Type
(Mitsubishi Product)
TH-N20CXHZKP-0.7A
TH-N20CXHZKP-1.3A
TH-N20CXHZKP-2.1A
TH-N20CXHZKP-0.24A
TH-N20CXHZKP-0.35A
TH-N20CXHZKP-0.9A
TH-N20CXHZKP-1.3A
TH-N20CXHZKP-2.1A
TH-N20CXHZKP-2.5A
TH-N20CXHZKP-3.6A
on request
on request
Fig. 3-36:
Connecting the thermal relay
To a resistor
Inverter
Thermo relay
(OCR)
T
OFF
OCR
contact
Contact Rating
110 V AC/5 A
220 V AC/2 A (AC 11 class),
110 V DC/0.5 A
220 V DC/0.25 A (DC 11 class)
Brake
resistor
I002043E
I001458E
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