Mitsubishi Electric FR-E500 Instruction Manual page 45

( 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.
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.
INSTALLATION AND WIRING
NFB MC
Inverter
R (L
S (L
T (L
P (+) N (-)
T (Note 3)
P
BU brake unit
Brake unit
HC HB
OFF
32
Motor
U
)
1
V
)
2
W
)
3
Remove jumpers.
Discharge resistor
HA HB HC
TB
PR
PC
OCR
OCR
Constant-
voltage
-
power
+
supply
ON
MC
MC
IM
N
Comparator