1-4 Connection 1 3G3AX-RBU42/-RBU43 Connection Example „ When the optional Braking Resistor 3G3AX-RBA/-RBB/-RBC is used The following is an example of connections using the Braking Resistor 3G3AX-RBA/-RBB/-RBC. Up to two units can be connected in parallel. For parallel connection, use Braking Resistors with the same resistance. For DIP switch settings, refer to "2-1 DIP Switch Setting"(page 2-1).
Design MC1 MC2 RY (*1) BSS RY MC1 200 V 50/60 Hz 220 V 60 Hz Operation power supply BS MC2 R MCB MC1 MC2 R/L1 Inverter U/T1 Motor 3-phase 400 V S S/L2 V/T2 T T/L3 W/T3 3G3AX-RBA /-RBB/-RBC P/+2 P P N SL1 SL2 AL1 AL2 RB 3G3AX-RBU42 /-RBU43 Master N/- 1(AL1) 2(AL2) P RB MA1MA2 3G3AX-RBA /-RBB/-RBC P P N SL1 SL2 AL1 AL2 RB 3G3AX-RBU42 /-RBU43 Slave 1(AL1) RB MA1MA2 2(AL2) P •A voltage of 800 V DC (max.) is applied to the Braking Resistor. Check the rated dielectric strength of the resistor to be connected. •To use the optional Braking Resistor (3G3AX-RBA/-RBB/-RBC), be sure to connect two resistors of the same model in series.
If the 3G3AX-RBU42 or -RBU43 is operated with a single resistor, the Braking Resistor may have a fault. •To prevent overheating, be sure to connect the alarm contacts 1 (AL1) and 2 (AL2) of the Braking Resistor. •The models of 3G3AX-RBU42/-RBU43 do not have terminals for the alarm input (R1, R2). Configure a sequence that enables the Inverter power to turn off when unusual overheating is detected. *1. To select RY, check the MC coil and RY contact specifications. 1-13