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Connection to the stand-alone option
1.6.2 Connection of the brake unit (FR-BU)
When connecting the brake unit (FR-BU(H)) to improve the brake capability at
deceleration, make connection as shown below.
*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.
U
V
W
P/+
N/−
R/L1
S/L2
T/L3
Motor
IM
Inverter
PR
N/−
P/+
P
HA
HB
HC
FR-BU
FR-BR
TH2
TH1
PR
*1
Three-phase AC
power supply
MCCB
MC
OFFON
MC
T *2
MC
*4
5m or less