INSTALLATION AND WIRING
31
(
2
)
Connection of the BU brake unit (option)
Connect the BU brake unit correctly
as shown on the right. Incorrect
connection will damage the inverter.
MC
R (L
1
)
S (L
2
)
T (L
3
)
U
V
W
Motor
IM
Inverter
HCHBHA
TB
HC HB
ON
Brake unit
MC
MC
OFF
P (+)
N (-)
P
OCR
Discharge resistor
Remove jumpers.
PR
OCR
-
+
BU brake unit
N
NFB
Constant-
voltage
power
supply
Comparator
PC
T (Note 3)
Note:1. The wiring distance between the inverter, brake unit and discharge resistor
should be within 2m (6.56 feet). If twisted wires are used, the distance
should be within 5m (16.40 feet).
2. If the transistors in the brake unit should fail, the resistor will be extremely
hot, causing a fire. Therefore, install a magnetic contactor on the inverter's
power supply side to shut off current in case of failure.
3. When the power supply is 400V class, install a step-down transformer.
2
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