VFD - Variable Frequency Drives

Variable frequency drives, also known as adjustable speed drives or inverters, help regulate motor acceleration by providing initial low frequency and voltage currents that increase at a slower, controlled rate.  When used on bridge, trolley or hoist applications, the VFDs offer smooth, ramped acceleration and deceleration.  This enables motors to run cooler, allows for greater equipment control, increases load spotting benefits, and ensures a soft starting and stopping of the equipment.  Get in touch with our Customer Service Department for additional information regarding variable frequency drive features and benefits.

IMPULSE® G+ Series 3 - The latest generation in advanced control technology after the Series 2.  It is used for traverse motions and in hoists with worm gear and mechanical load brakes.  Suitable for CMAA Class A-F service, it comes standard with a speed range of 40:1 in V/F and 100:1 in Open Loop Vector.  It is also equipped with up to 6 distinct speeds, 2-step infinitely variable, 3-step infinitely variable and analog signal capabilities.  Other features include Load Check™, to reduce the possibility of lifting an overload, Quick Stop™ to reduce possibility of crane collision, phase lose detection, motor lead reversal, stall prevention, programmable fan, and many other benefits.

  Impulse G+/VG+ Series 3 Product Brochure

IMPULSE® VG+ Series 3 - Also part of the latest in advanced control technology, it is used for traverse motions and in hoists with non-mechanical load brakes.  The VG+ Series 3 is suitable for CMAA Class A-F service, is available with a speed range of 1000:1, with up to 6 distinct speeds, 2-step infinitely variable, 3-step infinitely variable, and analog signal capabilities.  It can be used as a Closed Loop Vector crane control.  Some of its features include phase loss detection, Load Float™ (for allowing a load to be held aloft at zero speed without setting the electric brake), Loadshare for the use of two or more motors on the same drive shaft, snapped shaft detection, Roll-back detection, Load Check™, and Quick Stop™.

  Impulse G+/VG+ Series 3 Product Brochure

IMPULSE® G+ Series 2 and IMPULSE® VG+ Series 2 - Both models are limited in availability, but will continue to be serviced until 2012.  The G+ Series 2 is commonly used for traverse motions and hoists with load brakes, as well as NEMA A or B single speed, squirrel cage induction motors.  The VG+ Series 2 is used for traverse motions and hoists with non-mechanical load brakes.

  Impulse G+/VG+ Series 2 Product Brochure

IMPULSE® P3 Series 2 - Compact in design, it is suitable for CMAA Class A-D service, has a 40:1 speed range, three speed control methods with up to 5 distinct speeds, infinitely variable control, and analog speed reference.  Ratings are 380-460 VAC, ½ to 10 HP, and 200-230 VAC, ¼ to 10 HP.  It is typically used for traverse motions and hoists with mechanical load brakes and worm gearing.  Some of its features include motor thermal overload protection, Quick Stop™ to reduce the possibility of crane collision, Swift-Lift™ for overspeeding with light loads or empty hook, and quick programming capabilities.

  Impulse P3 Series 2 Product Brochure

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J. Herbert Corporation is a woman owned minority business.