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How does using a variable speed drive reduce energy consumption?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

 

Installing a variable speed drive allows direct control of the motor output speed to meet the application demands. As the speed is reduced, the power required decreases. By operating the system at the lowest possible speed required for the application, energy consumption is reduced.  For example, at 80 percent speed, only 51 percent of full load power is required to drive a pump or a fan. 

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What is motor overload protection?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

KB’s AC drives contain Motor Overload Protection (I²t) with RMS Current Limit (CL). The I²t function provides overload protection and prevents motor burnout. KB’s AC drives are UL approved as an electronic overload protector for motors.

With I²t, if the motor is overloaded to 120% of the motor nameplate rating, the I²t timer will start, triggering the drive to trip in 30 minutes. As the motor continues to experience an increase in load, the time it takes the drive to trip decreases. Finally, if the motor is overloaded to 160%, the drive will trip in six seconds. The CL factory settings are for a maximum overload of 160%, limiting the motor current and torque.

Some drive manufacturers do not have the current limit feature. During an extreme overload the I²t time is very short, which will cause an undesirable nuisance trip.

 

 



What is under voltage protection?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

If the AC line voltage falls below specifications the drive cannot maintain the rated torque or power requirements. To prevent damage to the motor, the drive will shut down. When the voltage returns to a safe limit, the drive, depending on presets and programming, will automatically restart or may require a manual restart.

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NEMA 1 enclosure versus a NEMA 4X enclosure?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

 What is the difference between a KB Drive with a NEMA 1 enclosure and a NEMA 4X enclosure?

NEMA enclosures, in general, are designed to prevent electrical shock by protecting the user from incidental contact with the components contained within.

KB’s NEMA 1 drives provide a degree of protection against falling dirt. They are equipped with knockouts for standard electrical fittings.

KB’s NEMA 4X drives are constructed with a rugged die-cast aluminum enclosure with a hinged cover. They offer watertight integrity, which makes them ideal for harsh washdown indoor or outdoor applications. They are equipped for use with liquidtight electrical fittings.

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Can KB’s AC Drives operate with GFCI?

KB Electronics, Inc. Manufacturer of AC Drives, DC Drives & Variable Speed Controls

GFCI’s will trip when used with most AC Drives.  KB’s AC Drives contain special software to allow them to operate with GFCI circuits. This is a standard feature on our Digital AC Drives and optional, with factory programming, on all AC Hybrid Drives.


 



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