The voltage supplied by the PLC to the solenoid valve should be 220V, but when the PLC does not output any signal, the voltage is 70V. What is the reason for this?

2015-08-09View Original

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During the instrument maintenance yesterday, the cause could not be identified. When the PLC sends an output signal, 220V is generated, which is normal; but why is the voltage 70V when there is no output? All other solenoids have a voltage of 220V when output is active and 0V when there is no output. Please give me some advice, experts

Reply #22015-08-09

Is this 70 you mentioned measured on-site? It is recommended to measure at the cabinet terminals to determine whether the issue lies before the cabinet terminals or in the wiring

Reply #32015-08-09

I think this 70V is an induced voltage; go and measure it at the PLC relay output!

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The voltage supplied by the PLC to the solenoid valve should be 220V, but when the PLC does not output any signal, the voltage is 70V. What is the reason for this?

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