PQSI Coil-Locks: Completely Integrated Voltage Sag Tolerant Module
Electric service supply voltage sags and dips are a fact of life. Caused by weather, falling tree limbs, and animal intrusion events, electric utility system faults are unavoidable and can be expected dozens of times a year at the typical facility site.
The good news is that critical process equipment can stay up and running when you need it by applying PQSI Coil-Locks on relays, contactors, and motor starters that often are diagnosed as weak links in automated production lines because these coil operated devices usually have a low tolerance to electric service voltage sags.
The 120Vac and 240Vac Coil-Lock products shown in the above photos represent a major breakthrough in assembling electronic components for cost-effective voltage sag protection.
The Coil-Lock electronics works with AC relays, contactors, and solenoids as a hold-in-device that keeps motors and other critical process elements on the line during those annoying momentary voltage sags.
Literally, any device that is controlled by energizing an AC coil, when powered through a Coil-Lock unit will continue to operate as intended through these power disturbances. Not only does the Coil-Lock protect the coil circuits from voltage sags, but also has the ability to protect coils from lightning and switching induced transients just like a surge suppressor.
The Coil-Lock's compact packaging combined with its Din Rail octal relay socket-mounting base make the Coil-Lock unit easy to fit into almost any commercial and industrial application.
Product Documentation
Download PDF480
VOLTAGE SAGS 25% TO 87% LESS THAN .02 SECS.
Devices protected by Coil-Locks will operate thru these frequent short duration voltage sags
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VOLTAGE SAGS 70% TO 87% UP TO 3 SECONDS
Devices protected by Coil-Locks will operate through these longer voltage sags
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VOLTAGE SAGS 25% TO 70% UP TO 3 SECONDS
Devices protected by Coil-Locks will operate even in these extreme, longer voltage sags
*Electric Power Research Institute (EPRI), Canadian Electric Associations (CEA), and National Power Laboratory (NPL)
NiceCube: Completely Integrated Voltage Sag Tolerant Module
Typically referred to as an "ice cube" relay due to its clear plastic cover that resembles a square ice cube, these AC-powered relays may be susceptible to many voltage sags that do not affect other elements of a control system.
Power Quality Solutions Incorporated (PQSI) has successfully developed and had tested by UL/CSA a "NiceCube" design that has proven to be a viable solution to this vexing problem. The NiceCube design offers a simple, elegant, and completely integrated module solution that includes a voltage sag tolerant general purpose DC DPDT relay that allows for the quick, easy replacement of an existing AC DPDT sensitive 24Vac or 120Vac relay for retrofit or new applications.
This solution vastly improves the voltage sag ride-through characteristics of previously vulnerable electrical control system circuits such as emergency off circuits (EMO) in semiconductor tools and industrial production lines—with no capacitance incorporated in the design. Therefore, with no time delay for dropout, the NiceCube also finds application in chiller and air compressor controls as well.
