User Manual EM303B General Purpose Inverter Wiring: Danger 1 ． Wiring must be performed by authorized and qualified personnel. Risk of danger. 2 ． Circuit-breaker should be installed between inverter and the mains. Risk of fire. 3 ． Be sure that the power supply is off before wiring, and ground inverter as per standard wiring. Risk of electrical hazard. 4 ． Grounding terminal must be grounded. Risk of electrical hazard and fire. 5 ． Dual keypad is not recommended. Risk of unexpected danger. Caution 1 ． Never connect input power supply cable to output terminals U, V, and W of inverter. Pay attention to the terminal symbols, connect them correctly. Risk of inverter damage.
2 ． Be sure that the wiring meets EMC requirements and local safety standard. Cables should be in recommended sizes. Risk of accident. 3 ． Do not connect braking resistor to DC bus terminal & . Risk of fire. 4 ． Tighten terminals with screw drivers of specified torque. Risk of fire. 5 ． Do not connect phase-shifting capacitor and LC/RC noise filter to output circuits. 6 ． Do not connect the solenoid switch and electromagnetic contactor to output circuits. Otherwise, it will trigger overcurrent protection, or damage inverter. 7 ． Do not disconnect internal wires of inverter. Risk of inverter damage. Before Power-on Caution 1.
Verify that the input voltage is identical to the rated voltage of product, correct wiring of input terminals R, S, and T and output terminals U, V, and W, wiring of inverter and its peripheral circuits, and all wires should be in good connection. Risk of inverter damage. 2. Never perform voltage withstanding test on inverter, it has been done at ex-works. Risk of accident. Danger 1. Inverter shall be power-on only after the front cover is assembled. Risk of electrical hazard. 2. Wiring of all peripherals should abide by the guide of this manual. Risk of accident. 5