The FR-BU is compatible with the FR-A820-03160(55K) or lower and the FR-A840-01800(55K) or lower. OFF ON MC T *2 MC MCCB MC FR-BR PR Three-phase AC power supply R/L1 S/L2 T/L3 V W U Motor M P TH1 TH2 Inverter PR FR-BU *3 PR PX P/+ N/- P/+ HA HB N/- HC *1 When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU(-H)). (Incorrect connection will damage the inverter.) *2 When the power supply is 400 V class, install a stepdown transformer. *3 For the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower, be sure to remove the jumper across terminals PR and PX.
*4 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) must be within 5 m. When using twisted pair cable, use the cable within 10 m. If the transistors in the brake unit should become 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 except when connecting a DC reactor (FR-HEL). 2.10.4 Connection of the brake unit (BU type) Connect the brake unit (BU type) correctly as follows. Incorrect connection will damage the inverter.
Remove the jumpers across terminals HB and PC and terminals TB and HC on the brake unit, and fit one across terminals PC and TB. The BU type brake unit is compatible with the FR-A820-03160(55K) or lower and the FR-A840-01800(55K) and lower. T *1 OFF ON MC MCCB MC MC Three-phase AC power supply Brake unit (BU type) TB Remove the jumper N OCR HC *2 HB HA OCR PC PR Fit a jumper *1 When the power supply is 400 V class, install a stepdown transformer. *2 For the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower, be sure to remove the jumper across terminals PR and PX. P The wiring distance between the inverter, brake unit, and discharging resistor must be within 2 m.
Even when the cable is If the transistors in the brake unit should become faulty, the resistor will overheat and result in a fire. Install a magnetic twisted, the wiring length must be within 5 m. 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 except when connecting a DC reactor (FR-HEL). 104 2. INSTALLATION AND WIRING 2.10 Connection of stand-alone option units *1 *4 10 m or less *4 10 m or less NOTE Inverter U R/L1 V S/L2 W T/L3 N/- P/+ PR PX Discharging resistor NOTE