For the specific steps of electrical circuit troubleshooting and analysis, Xiangtai Electric believes that the following four aspects can be considered:
1) First, analyze the power supply part: measure the power supply to see if there is any If the power supply is abnormal, check whether the circuit breaker of the power supply is tripped, whether the fuse or fuse of the secondary control circuit is blown, and whether the contacts of the power switch are in good condition. In actual work, many people often ignore this step. If the power supply part of the device is normal, this step can be skipped.
2) Check the input part of the equipment: In a closed-loop automatic control system, if there is no input signal or the input signal is abnormal, the system will not work properly. Check whether the input sensor is faulty or disconnected. In electrical control, if the contact of the function input button is abnormal or the self-protection contact of the relay is in poor contact, the electronic control system will not work properly. If all input signals are normal or the function control buttons and self-protection contacts are normal, skip this step.
3) Check the output part of the device: If there is an output signal from the controller, but the actuator (such as a frequency converter) does not move, it means there is a problem with the execution part or there is a problem with the connection to the actuator. In electrical control, check whether the power output to electrical equipment such as motors is normal and whether there is any phase loss problem. If it is normal, it means there is a problem with the electrical equipment (or motor) itself. If the controller's output signal is normal, skip this step.
4) Check the intermediate circuit and main controller: Start with the power supply and check the intermediate circuit in order from top to bottom to see which component has the power outage or phase loss, and then solve it. For the main controller (such as PLC), first check at a single point whether the action of the output port and the output signal are normal. If normal, then focus on checking the program to see where the problem is.