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English Translations » 【仪表自控交流圈】 » Is the 50VAC induced electrical energy from the electric val

Is the 50VAC induced electrical energy from the electric valve feedback isolated by a safety barrier?

2017-05-02View Original

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After modifying an electric valve, the electrical technicians detected 50VAC of induced voltage when measuring the signal feedback contacts with respect to ground, and 11VAC of induced voltage when measuring between the wires. Previously, our instruments provided a 24VDC voltage as feedback. I would like to ask whether it’s possible to use a safety barrier directly in this case? Why,
Reply #22017-05-02
It can be isolated using a safety barrier; the feedback voltage does not come from the system side – it’s a problem on the side of the solenoid valve voltage.
Reply #32017-05-02
The same is true for the channel card of the Tean combustible gas detector: the channel card is powered by 220AC, but when using a multimeter to measure the positive and negative terminals of the three-core cable (for power supply 24DVC and the current signal), the voltage is 24V; however, there is 110V with respect to ground. . I’ve been numbed several times. Why is this induced electricity so strong? . How to eliminate it?
Reply #42017-05-02
Is it the shield cable that is the issue? If so, grounding it on one side can solve the problem; if not, the only option is to replace the shield cable
Reply #52017-05-03
It was because after the modification, the signal position of the dry contact feedback from the electric valve changed. To simplify things, the electrical team used a wire from their 220VAC multi-core cable as the dry contact; as a result, induced voltage appeared. The electrical team then added a resistor-capacitor, and the induced voltage disappeared. However, the management said that this approach wasn’t acceptable and that rewiring was necessary
Reply #62017-05-03
It was because after the modification, the signal position of the dry contact feedback from the electric valve changed. To simplify things, the electrical team used a wire from their 220VAC multi-core cable as the dry contact; as a result, induced voltage appeared. The electrical team then added a resistor-capacitor, and the induced voltage disappeared. However, the management said that this approach wasn’t acceptable and that rewiring was necessary

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Translated at 2026-07-21 02:49:06

Original: https://bbs.hcbbs.com/thread-1775034-1-1.html

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