Solutions / Surveys

Symptoms of Electric Power Quality Problems.

Electric Power Voltage Drop Solutions:
Coil-Locks

Power Quality problems are failure or misoperation of customer end-use equipment caused by voltage, current or frequency deviations.

PQSI Coil-Lock Applications
Coil-Locks Eliminate Weak Links
Relays, contactors, and motor starters are used extensively in commercial and industrial facilities to control business machines and process equipment. These devices often have a low tolerance to electric service voltage and are frequently diagnosed as “weak links” in automated production lines.

Coil-Locks Eliminate Costly Equipment Shutdown
During common voltage, the solenoid coils in these motor-driven systems may de-energize long enough to cause the power circuit mechanical contacts to open (chatter), and the connected electrical equipment to shut down. The Coil-Lock eliminates costly process shutdown, installs in minutes, and can be a cost-effective alternative to other voltage protection methods.

38 Times Per Year Average

Coil-Locks Eliminate Disruption of Operations

Note: There are > 240 facility voltage drops/year down to as much as 25% of nominal supply voltage that last for < 0.02 Seconds, and ~ 0 to 16 voltage drops/year that can last up to 3 Seconds.

* Survey Sources: Electric Power Research Institute (EPRI), Canadian Electric Associations (CEA), and National Power Laboratory (NPL).

38 Times Per Year Average

90 VRMS and Lower

Note: This slide illustrates the typical quantity and time durations recorded for the facility voltage sag events in the End Users Surveys* Some examples of utilizing this data are shown below:

Quantity 38 x 0.41% = ~ 16 Voltage Sag Events each year lasting ~ 2 to 10 Cycles

Quantity 38 x 0.22% = ~ 8 Voltage Sag Events each year lasting ~ 10 Cycles to 1 Second

Quantity 38 x 0.20% = ~ 7 Voltage Sag Events each year lasting ~ 1 Second to 10 Seconds

Quantity 38 x 0.07% = ~ 3 Voltage Sag Events each year lasting ~ 10 Seconds to 1 Minute

Quantity 38 x 0.04% = ~ 2 Voltage Sag Events each year lasting ~ 1 Minute to 5 Minutes

* Survey Sources: Electric Power Research Institute (EPRI), Canadian Electric Associations (CEA), and National Power Laboratory (NPL).

Coil-Lock's Superior Performance

8 - Unprotected Vs Coil-Lock Protected Devices

Note: This illustration depicts the Tolerance and Protection Curves for “Unprotected Solenoid Coils versus PQSI Coil-Lock Protected Coils.” The YELLOW shaded area suggests that unprotected solenoid coils will generally ride through voltage sags in this region.

The GREEN shaded area indicates that solenoid coils protected by a Coil-Lock will continue to keep their contactors/relays energized for voltage sags in this region.

In the RED shaded area, the solenoid coil is de-energized to maintain the safety functions for emergency stop circuits.

38 Times Per Year Average

sec 9 - Voltage Sags in Seconds

Note: This GREEN shaded area in this illustration depicts the typical SEMI F47 voltage sag tolerances that facility equipment is required to operate; i.e. 0% voltage input for up to 20 milliseconds; 50% voltage input for ~ 0.2 seconds; 70% voltage input for ~ 0.7 seconds; 80% voltage input for ~ 10 seconds; and 90% voltage input for ~ 100 seconds

Orginal and After Installation

Diagams of Installation

Figure 1 = Original  Installation

Figure 2 = After Installation

Figure 3 – Base Connection Layout

Coil-Lock is an affordable option

Solution Cost Breakdowns

Note: This slide compares selective voltage sag protection options in their initial costs, installation costs, maintenance costs, and life cycle costs.

The original manufacturer became the new owner

History of PQSI and AMerican Circuits

Ralph Ferraro, the original owner and designer, partnered with ACI of Charlotte NC to manufacture the Coil-Locks in their state of the art robotics facility. Upon retirment he sold the company to ACI who continues to build the products today. 

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