Second, the electrical wiring debugging method
After the wiring is completed, we will perform line debugging to ensure that there are no errors.
First of all, we have to check whether the cable is connected incorrectly. Do not connect the cable of the A motor to the B motor. The cable of the A fan is connected to the B fan, especially the line that wears the same pipe. The control cable has the same cable. The color or number corresponding to each terminal on the terminal block of the electrical cabinet corresponds to the field operation point. For example, a button corresponds to a yellow line, but when it reaches the terminal of the electrical cabinet, it is connected with a green line. These should be checked carefully. Look at the motor phase between the short circuit, check whether there is a short circuit with the chassis, whether there is an open circuit, whether the button and indicator lines and terminal wiring match the circuit diagram, and so on.
Secondly, the circuit should be debugged first. We should debug an electrical cabinet in an electrical cabinet. For example, the first electrical cabinet is all motor circuits. We can push the switch up and jog the contactor to see if the motor is reversed. If the reverse is changed immediately. Then try the second electrical cabinet, such as the fan circuit, and jog the contactor to see if the fan is reversed.
Third, debug all the buttons, now many control system buttons are connected to the PLC, we can press each button on the spot, another person in the PLC to observe the corresponding input indicator is not bright, if not, find out the reasons. Resolve the problem and make sure all button signals are OK and the button light is on.
Fourth, debug all the feedback signals of the main circuit, such as all the motors in the first electrical cabinet. We can move the contactor one by one to check whether the signal is fed back to the PLC. If not, check the line. Observe whether the sampling signal is sampled, such as the ammeter connected to the current transformer. Use a screwdriver to hold the contactor to observe the current meter for current indication.
Fifth, manually run the inverter, DC governor, check the motor for any problems, the gearbox has no abnormal noise, and the motor encoder has no feedback. For example, this time we are debugging the 590 DC governor. We made a simple small button box. One of the two selector switches is used to start one for enabling. A potentiometer is used to give a 0-10V signal. We connect the button box to the governor and then we can The motor is commissioned and the encoder feedback signal can be seen on the 590. For example, when a DC motor is tested, we will report an error immediately. This is because the direction of the encoder feedback is opposite to the actual direction of the motor, and the direction of the motor is correct. So we reverse the A and B signals of the encoder. It is.
Sixth, check if the signal source of all other feedback signals can feedback the signal to the PLC normally. For example, for an electrical appliance, we use the transformer to sample the current signal to trigger the intermediate relay, and use the normally open signal of the intermediate relay to feed back to the PLC. We can use the screw to press the contactor of this appliance to energize, observe whether the corresponding input indicator of the PLC is on, and ensure that there is no problem with the feedback signal. For example, if a position sensor on the site feeds back different resistance values as the position moves, we can move the position to let one person measure whether the resistance value of the other end of the electrical cabinet line changes normally to ensure normal feedback of the resistance signal and eliminate the line. The feedback caused by the problem is wrong.
At this point, we can basically eliminate the line problems one by one, you can proceed to the next PLC program debugging, the whole set of equipment linkage debugging.
Summarize the above content, the actual is to install the line first, then put the secondary line, put a specification cable to complete the copper nose to connect the line, one stage and one stage to complete; when debugging, first check the line safety, Then debug the motor direction, and then ensure that the manual operation is normal, the signal is fed back to the PLC or other controller. Step by step, clear thinking, find problems and solve problems, improve your ability to work. I hope to be helpful.
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