Mitsubishi Electric 800 Series Instruction Manual page 66

2.11.3
Connection of the brake unit (BU type)
Connect the brake unit (BU type) correctly as shown below. Incorrect connection will damage the inverter. Remove the
jumpers across terminals HB and PC and terminals TB and HC of the brake unit and fit one across terminals PC and TB.
The BU type is compatible with the FR-A846-01800(55K) or lower.
MCCB
Three-phase
AC power
supply

NOTE
• The wiring distance between the inverter and brake unit (BU type), and between the brake unit (BU type) and discharging
resistor must be within 2 m. Even when the cable is twisted, the wiring length must be within 5 m.
• If the transistors in the brake unit should becomes faulty, the resistor will overheat and result in a fire. Install a magnetic
contactor on the inverter's input side and configure a circuit that shut off the current in case of a fault.
• Remove the jumper across terminals P/+ and P1.
Inverter
MC
R/L1
S/L2
T/L3
Install a stepdown transformer.
Connection of stand-alone option units
T ∗1
MC
Motor
U
V M
Brake unit
W
(BU type)
N/-
N
P/+
Discharging
OCR
resistor
PR
P
INSTALLATION AND WIRING
ON OFF
MC
Remove the
jumper
TB
HC
OCR
HB
HA
PC
Fit a jumper
2
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