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Connection to the Stand-Alone Option
1.6 Connection to the Stand-Alone Option
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the
option unit carefully in accordance with the corresponding option unit manual.
1.6.1 Connection of the brake unit (BU type)
Connect the BU type brake unit correctly as shown below. Incorrect connection will
damage the inverter. Remove jumpers across terminals HB-PC and TB-HC and
connect a jumper across terminals PC-TB of the brake unit.
CAUTION
1. The wiring distance between the inverter, brake unit and discharge resistor
should be within 2m. If twisted wires are used, the distance should be within
5m.
2. 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
inverter's power supply side to shut off a current in case of fault.
3. The N terminal is not provided for the FR-S520E-0.1K to 0.75K.
4. When the power supply is 400V class, install a step-down transformer.
Motor
Inverter
BU(-H) type brake unit
T(Caution 4)
MC
U
V
W
HCHBHA TB
P
OCR
PR
NFB
PC
ON
OFF
MC
OCR
N
MC
Remove
jumpers.
IM
Discharge resistor
Connect a
jumper.
Power
supply
(Caution 3)
R/L1
S/L2
T/L3
N/-
P/+