Connection of stand-alone option units
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the Instruction Manual of the corresponding option unit.
2.10.1 Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2) as follows to improve the braking capability during deceleration.
After making sure that the wiring is correct and secure, set "11 or 111" in Pr.30 Regenerative function selection.
Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.
When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU2). (Incorrect connection will
damage the inverter and brake unit.)
For the FR-A842-08660(355K) or lower, up to two cables can be connected to terminals P/+ and N/-. For the FR-A842-09620(400K) or higher,
up to four cables can be connected. To use more cables, use a bus bar.
When the power supply is 400 V class, install a stepdown transformer.
The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (FR-BR) must be within 5 m. When using twisted pair cable, use
the cable within 10 m.
The contact between TH1 and TH2 is open in the normal status and is closed at a fault.
The CN8 connector used with the MT-BU5 type brake unit is not used.
CR2 CR3 CR4
10 m or less
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units