Connection example with the FR-BR(-H) resistor unit OFF ON 1 MC T *2 MC 2 MCCB MC FR-BR TH1 PR Three phase AC power supply R/L1 S/L2 T/L3 U V W Motor M P *5 3 *4 TH2 Inverter PR FR-BU2 A B C 4 *3 PR PX P/+ N/- *1 N/- BUE SD P/+ 5 *4 *1 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.) *2 When the power supply is 400 V class, install a stepdown transformer. *3 Be sure to remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of FR-A820-00490(7.5K) or lower, or FR- A840-00250(7.5K) or lower.
*4 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. *5 The contact between TH1 and TH2 is closed in the normal status and is open at a fault. 6 7 Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor (FR-HEL). 8 Connection example with the MT-BR5 type resistor unit After making sure that the wiring is correct and secure, set Pr.30 Regenerative function selection = "1 or 101" and Pr.70 9 Special regenerative brake duty = "0 (initial value)". Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.
10 Three phase AC power supply Inverter Brake unit FR-BU2 Resistor unit MT-BR5 *1 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.) *2 When the power supply is 400 V class, install a stepdown transformer. *3 The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (MT-BR5) must be within 5 m. When using twisted pair cable, use the cable within 10 m. *4 The contact between TH1 and TH2 is open in the normal status and is closed at a fault. *5 The CN8 connector used with the MT-BU5 type brake unit is not used.
The warning "oL" of the stall prevention (overvoltage) does not occur while Pr.30 Regenerative function selection = "1 or 101" and Pr.70 Special regenerative brake duty = 0% (initial value). (Refer to page 743 .) 2.10.3 Connection of the brake unit (FR-BU) Connect the brake unit (FR-BU(-H)) as follows to improve the braking capability during deceleration. 103 2. INSTALLATION AND WIRING 2.10 Connection of stand-alone option units 10 m or les NOTE T ∗2 MCCB MC ON OFF CR1 Motor R/L1 U S/L2 V M MC T/L3 W MC 10 m ∗1 or less ∗4 CR1 P/+ P ∗3 P TH1 N/- N P ∗3 PR BUE PR SD A TH2 B C P TH1 PR TH2 10 m or less ∗3 NOTE