Connection of stand-alone option units
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2
2.9.2
Connection of the brake unit (FR-BU)
Connect the brake unit (FR-BU(H)) as shown below to improve the braking capability during deceleration.
The FR-BU is compatible with the FR-F846-01160(55K) or lower.
NOTE
• If the transistors in the brake unit should becomes faulty, the resistor will overheat. Install a magnetic contactor on the
inverter's input side and configure a circuit that shut off the current in case of a fault.
• Do not remove the jumper across terminals P/+ and P1.
When wiring, make sure to match the terminal symbol (P/+, N/-) at the inverter side and at the brake unit
(FR-BU(H)) side. (Incorrect connection will damage the inverter.)
Install a stepdown transformer.
The wiring distance between the inverter and brake unit (FR-BU), and between the brake unit (FR-BU)
and resistor unit (FR-BR) must be within 5 m. Even when the cable is twisted, the wiring length must be
within 10 m.
U
V
W
P/+
N/-
R/L1
S/L2
T/L3
Motor
M
Inverter
10 m or less
PR
N/-
P/+
P
HA
HB
HC
FR-BU
FR-BR
TH2
TH1
PR
Three-phase AC
power supply
MCCB
MC
MC
OFF
ON
MC
T
∗2
∗1
∗3
