User Manual of EM760 High-Performance Inverter 3.2.7 Ground wire ● The ground terminal must be grounded. ● The ground wire must not be shared by the welding machine and power devices. ● Select the ground wire according to the technical specifications for electrical equipment, and minimize the length ofthe ground wire connected to the grounding point. ● Where two or more inverters are used, the ground wires must not form a loop. The correct and incorrect grounding methods are shown below. Fig. 3-15 Connection of Ground Wire 3.2.8 Installation and wiring of braking resistor and braking unit Refer to Chapter 9 for the selection and wiring of the braking resistor and braking unit.
For the inverter with a built-in braking unit, connect the braking resistor between the inverter terminal (+) and PB terminal. For the inverter with no built-in braking unit, connect the terminals (+ and -) of the braking unit to those (+ and -) of the DC bus of the inverter, and the braking resistor to the PB+ and PB- terminals of the braking unit. Refer to the user manual of the BR100 braking unit for more information. 3.3 Wiring of Control Circuit Terminal 3.3.1 Composition of control circuit terminal Fig. 3-16 Layout of Control Circuit Terminals 53