In the power distribution of the equipment, the inverter, AC contactor, relay and switching power supply, etc. will generate interference signals. The interference of the inverter to the plc and the stepping motor is obvious. The harmonics of the inverter can make the PLC display flicker, which can make The PLC key failure can make the PLC signal input and output work abnormally; the interference of the inverter can cause the stepping motor to generate vibration and run out of step. The main reasons and solutions:
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1, the poor performance of the inverter interference is also large, you can also change the brand-name inverter test! It is best to have an iron shell!
2, the control line is added with a magnetic ring, and the stepping motor adds a running stop signal in addition to the pulse signal.
3. The signal line should not be arranged in parallel with the power line.
4, can reduce the inverter carrier, reduce the carrier frequency of the inverter
5. Adding an output reactor at the incoming line of the inverter can reduce harmonics, add a filter to the input end of the inverter, and add a reactor to the output of the inverter.
6. Ground the inverter
7, add a signal isolator
8, the inverter to the motor line is also shielded
9. The cabinet can be made of steel plate as a grille. The PLC and the inverter are separated. When the electromagnetic interference signal encounters the metal, it will flow away from the surface and will not interfere with each other.
10. The grounding must be reliable. The shielding layer of the shielding wire should be grounded.
11. Connected to the ground, the signal shielding line should not form a parallel line with the power line of the inverter.
12. Install a magnetic ring on each line at the outlet end (the electronic market is sold, there is no magnetization), and each line is equipped with one. The bigger the better, the more round or more the line passes through the magnetic ring.
13, adjust the carrier frequency, this one, the analog signal plus a magnetic ring, if it can not be solved, it is necessary to change the discharge order inside the electrical cabinet, and the routing path, these are the causes of interference
14. You should install a magnetic ring on the signal line to suppress interference and reduce the carrier frequency of the inverter.
15. Install EMC filter equipment and add shielding box to the inverter.
16. Check if the power line and signal line of the inverter cross.
17, you can turn the inverter's switching frequency down! (4K, 8K, 12K)
18. The cable of the inverter should use shielded cable, so as to avoid interference with other electrical appliances.