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Connection Of The Brake Unit (fr-bu/mt-bu5) - Mitsubishi Electric FR-F720P-0.75K Instruction Manual

Fr-f700p series.
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Connection of stand-alone option units
2.5.2

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 (55K or lower)
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 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.
30
MCCB
T
*2
MC
Motor
R/L1
U
S/L2
V
M
T/L3
W
Inverter
*1
N/−
*3
10m or less
ON
OFF
MC
FR-BR
P
TH1
PR
TH2
FR-BU
PR
HA
P/+
HB
N/−
HC

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