english 
Power supply check: First use a multimeter to measure whether the power supply voltage is within the normal range specified by the equipment. The three-phase power supply must ensure that the three-phase voltage is balanced, and the deviation does not exceed ±10% of the rated value. If the voltage is abnormal, check whether there is a short circuit, open circuit or poor contact in the power supply line, check the status of the circuit breaker and fuse in the distribution box, check whether there is a tripping or fusing phenomenon, and replace the damaged fuse or repair the tripping fault in time.
Electrical component detection: Check the contactor, relay, button, sensor and other electrical components one by one. For contactors and relays, observe whether the contacts are ablated or oxidized, and use a multimeter to check whether the contacts are on and off normally. If the contacts are in poor contact or damaged, they need to be polished and repaired or replaced with new components; test whether the on and off status of the button when pressed and reset meets the requirements; check whether the sensor can sense the signal normally. You can simulate the working scene to observe whether the output signal of the sensor is normal. If the signal is abnormal, you need to further check the wiring and sensitivity of the sensor, and replace the sensor if necessary.
Line connection inspection: Carefully check the connection parts of the electrical circuit, check whether the wires at the terminal block and the terminal are loose or falling off, and whether there are problems such as broken skin, aging, and short circuit. For loose wiring, tighten it again; for damaged and aged wires, replace them in time and do a good job of insulation; if a short circuit is found in the line, it is necessary to check the short circuit point in sections, disconnect part of the line, use a multimeter to detect the resistance value, find the short circuit location and repair it.
Control system inspection: If the Metal Shear is equipped with a control system such as PLC, check whether the PLC's working status indicator is normal, read the PLC program through the programming software, check whether there is a fault code, and analyze the cause of the fault according to the code prompt. Check whether the communication line between the PLC and other electrical components is normal to ensure that the data transmission is accurate. At the same time, check whether the function of the operating interface such as the touch screen is normal and whether the touch response is sensitive. If there is a fault, check whether the relevant connecting wires and internal components are damaged.
