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-A846-01800(55K) or lower.
• 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.
Connection of stand-alone option units
10m or less
INSTALLATION AND WIRING