Connection Of The Brake Unit (Fr-Bu/Mt-Bu5) - Mitsubishi Electric FR-A740-00023 Instruction Manual

Connection of stand-alone option units
2.5.3

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 (01800 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 Be sure to remove a jumper across terminal PR-PX when using the FR-BU with the inverter of 00250 or less.
*4 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 inverter's input side to configure a circuit so that a current is shut off in case of fault.
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
42
MCCB
*3
T
*2
MC
Motor
R/L1 U
S/L2 V
IM
T/L3 W
Inverter
PR
PX
*1
N/−
*4
5m or less
ON OFF
MC
FR-BR
P TH1
PR
TH2
FR-BU
PR
HA
P/+
HB
N/−
HC