User Manual of EM730/EM730E Series Inverter Table 3-1 Cable Dimensions and Terminal Screw Specifications Note: 1: The specifications of the wire are dependent on its voltage drop. Under normal circumstances, the voltage drop calculated by the following formula should be less than 5V. Voltage drop = 3 * wire resistivity (Ω/KM) * wire length (m) * rated current (A) * 10 -3 2: If the wire is in a plastic slot, it should be enlarged by one level. 3: The wire should be crimped to the round terminal suitable for the wire and terminal screw. 4: The specification of the ground wire should be the same as that of the power cable smaller than 16mm 2 .
When the power cable is 16mm 2 or larger, the ground wire should not be smaller than 1/2 of the power cable. 3.2.7 Ground wire The ground terminal must be grounded. Pay special attention to the third type of grounding (grounding resistance: less than The ground wire must not be shared by the welding machine and power devices. 10Ω). Select the ground wire according to the technical specifications for electrical equipment, and minimize the length of the ground wire connected to the grounding Where two or more inverters are used, the ground wires must not form a loop. The point. correct and incorrect grounding methods are shown in Table 3-10.
Inverter Inverter Inverter Inverter Inverter Inverter Fig.3-10 Connection of Ground Wire 38 EM730/EM730E-090-3 M10 17.0～22.0 60 EM730/EM730E-110-3 90 EM730/EM730E-132-3 R, S, T, P, +, -, U, V, W 90 EM730/EM730E-160-3 120