Wiring Connection of stand-alone option units
FR-E700SC EC 3 - 37
3.7.3 Connection of a brake unit FR-BU2
When connecting a brake unit to improve the brake capability at deceleration, make connection as
shown below.
Connection example with the GRZG type discharging resistor
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If the control contacts are only specified for 230V control power you must install a transformer
when using a 400V power supply.
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Connect the inverter terminals (P/+, N/ā) and brake unit terminals so that their terminal signals
match with each other. (Incorrect connection will damage the inverter.)
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The wiring distance between the inverter, brake unit and resistor unit should be within 5m. If
twisted wires are used, the distance should be within 10m.
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If the transistors in the brake unit should become faulty, the resistor can be unusually hot, causing
a fire. Therefore, install a magnetic contactor on the inverters input side to configure a circuit so
that a current is shut off in case of fault.
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Refer to FR-BU2 manual for connection method of discharging resistor.
I002044E
Fig. 3-30: Connection with the brake unit FR-BU2
Brake Unit Discharging Resistor
Recommended External Thermal
Relay
FR-BU2-1.5K GZG 300W-50Ī© (one) TH-N20CXHZKP-1.3A
FR-BU2-3.7K GRZG 200-10Ī© (three in series) TH-N20CXHZKP-3.6A
FR-BU2-7.5K GRZG 300-5Ī© (four in series) on request
FR-BU2-15K GRZG 400-2Ī© (six in series) on request
FR-BU2-7.5K GRZG 200-10Ī© (six in series) TH-N20CXHZKP-3.6A
FR-BU2-15K GRZG 300-5Ī© (eight in series) on request
Tab. 3-19: Recommended external relay
ON
3-phase AC
power supply
OFF
Inverter
ā¤ 5m
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M
3~
Motor
ī
ī
T
ī
ī
Discharging
resistor
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