Connection Of Stand-Alone Option Units; Connection Of The Brake Unit (Fr-Bu/Mt-Bu5) - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

Connection of stand-alone option units

1.5 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 accident. Connect and operate the option unit carefully in
accordance with the corresponding option unit manual.
1.5.1

Connection of the brake unit (FR-BU/MT-BU5)

When connecting the brake unit (FR-BU(H)/MT-BU5) to improve the brake capability at deceleration, make connection
as shown below.
(1) Connection with the FR-BU (01160 or less)
Three-phase AC
power supply
*1 Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU (H)) terminals so that their terminal signals match
with each other. (Incorrect connection will damage the inverter.)
*2 When the power supply is 400V class, install a step-down transformer.
*3 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) should be within 5m. If
twisted wires are used, the distance should be within 10m.
CAUTION
⋅ 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 inverterís input side to configure a circuit so that a current is shut off in case of fault.
20
MCCB
T
*2
MC
Motor
R/L1 U
S/L2 V
IM
T/L3 W
Inverter
*1
N/−
*3
5m or less
ON OFF
MC
FR-BR
P TH1
PR
TH2
FR-BU
PR
HA
P/+
HB
N/−
HC