Do to a combination of problems in the field I have as much as 45 volts induced across a 120VAC control circuit. The power wiring (480VAC) is run in the same conduit along with several control loops and even water has been found in part of the underground conduit, but rather than correcting the field conduit problems at this time I need to suppress the induced voltage at the actuator. The induced voltage across the control circuit picks up relays intermittently and is pulsing an actuator motor. Could someone help me with the best way to lower the induced voltage and where would it be most effective, at the field device connection or within the control building? Thanks for any help you can offer.
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