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INSTALLATION AND WIRING
29
2.2.5 Connection of stand-alone option units
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or an accident. Connect and operate
the option unit carefully in accordance with the corresponding option unit manual.
(1) Connection of the dedicated external brake resistor (option)
Connect a brake resistor across ter and PR. Connect a dedicated brake
resistor only.
(For the positions of ter and PR, refer to the terminal block layout (page 19).)
PR
+
Brake resistor
P1
(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
L
1
L
2
L
3
U
V
W
Motor
IM
Inverter
HC
HB
HA
TB
HC HB
ON
Brake unit
MC
MC
OFF
+
−
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. If twisted wires are used, the distance should be within
5m.
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.