Coil Hold-In Device Solves One Plant's Sag Problem

Voltage sags and momentary interruptions plague power quality professionals worldwide. No business can afford the costly production losses that sometimes occur when small control relays de-energize during these events. This was the case for one facility in Marietta, Ohio. The plant, which produces polyvinyl styrene pellets for end-use processing at other facilities, found the control power circuits for its cooling water systems were particularly susceptible to voltage variations. Plant personnel wanted a cost-effective solution that would fit inside their existing control center and avoid the need for an extensive motor control redesign.