ZX7-400(PE50-400)Arc Welding Power SourceOperational ManualBeijing Time Technology Co., Ltd.- 16 -Table of ContentsPrecaution11 Overview述……………………………………………………………………………………52 Structure52.1 Appearance52.2 Structure of Front/rear Panel and Description明……………………………………………………………63 Main Function Unit and Working Principle principle …………………………………………………………63.1 Main Power Circuit73.2 Control, Protection and Display Circuit73.3 Power and Drive Circuit73.4 Remote Control Circuit (option)…………………………………………………………………74 Technology characteristics ………………………………………………………………………………74.1 Main Parameters74.2 Characteristics curve …………………………………………………………………………85 Installation and Operation95.1 Installation115.2 Operation115.3 Operation of Remote Controller (option)……………………………………………………………126 Fault and Maintenance126.1 Overheating Protection126.2 Over Current Protection136.3 Under Voltage Protection136.4 Over Voltage Protection136.5 Common Problems and Troubleshooting137 Maintenance and Care138 Wiring Diagram Figure ………………………………………………………………………………159 List of Main Spare Parts16Note: This product is subject to innovation. Any change will not be informed in advance. 1 OverviewThis Time ZX7-400 (PE50-400) arc welding power source is a DC manual arc welding power source produced by Beijing Time Technology Co., Ltd., adopting advanced semiconductor switching device IGBT module as main power device, and advanced inverter control technology, international advanced, suitable for welding of various acid/ alkaline welding electrodes, featuring easy arc ignition, less splash, no adhering of welding electrode etc.The inverter frequency of this welding machine is 20kHz, featuring compact main transformers and reactors, and compact and light welding machine, reducing copper/iron loss, enhancing efficiency and power factor, and featuring obvious energy-saving effect. This machine works outside acoustic frequency so as to avoid noise pollution.Advanced control technology brings excellent external characteristic and dynamic characteristics of power than other welding machines, meeting welding process requirements, ensuring high quality weld, and the operator can enjoy successful work.2 Structure2.1 AppearanceFigure 2-1 Appearance of welding machine2.2 Structure of Front/Rear Panels and DescriptionFront panel Rear panel1. Negative terminal (Black) 11. Overheating alarm lamp2. Positive terminal (Red) 12. Wire remote controller socket (Optional)3. Voltmeter- display of zero load voltage or arc voltage (Optional) 13. Inclined characteristics switch4. Amperemeter- display of setting current or welding current 14. Remote controller switch5. Current knob 15. Air switch -- power switch6. Thrust knob 16. Three-phase power input line 380VAC7. Arc ignition current knob 17. Fan casing8. Under voltage alarm lamp 18. Grounding terminal9. Over voltage alarm lamp10. Over current alarm lamp3 Main Functional Unit and Working PrincipleThis ZX7-400 arc welding power source is mainly consisting of main power circuits, control/protection/display circuits, power and drive circuits, remote control circuits etc, and the working principle is described as following:3.1 Main Power CircuitAfter switching on the machine, the three-phase AC power from grid is converted into DC power with small ripple after rectifying/filtering by the rectifying circuit, then inverted into high frequency AC power by the inverter circuit, and reduced by the main transformer, rectified and filtered by the final-stage rectifying circuit, realizing DC output.3.2 Control, Protection and Display CircuitThe control circuit is mainly designed to control output current, meeting requirements for output external characteristic and dynamic characteristics, and monitor the status of main circuit.The protection circuit is mainly designed to guarantee safe work of the main circuit. In case of abnormities of main circuit, such as over current on switch elements, overheating of power devices, grid voltage reduced to lower limit, the main circuit is cut off to avoid damage to the elements and grids.The display circuit is designed to display the set current/welding current (no display of setting current for inclined characteristics), zero load voltage/arc voltage (optional) via LEDs. The operator may pre-set accurate welding current directly via digital display, which is the arcing current. The actual welding current contains thrust current.3.3 Power and Drive CircuitThe power and drive circuit is designed for two functions: one, supply power for drive circuit and control circuit; two, drive power devices for inverting.3.4 Remote Control Circuit (option)The remote control circuit is mainly used for remote or over。