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DEKKER Vacuum Technologies, Inc. offers Vmax-VFD oil-sealed liquid ring vacuum pump systems with Variable Frequency Drive in capacities ranging from 150 – 4500 CFM.

ADVANTAGES:

• Control of Power Consumption (Up to a 50 percent turndown in power, resulting in substantial savings
• Control of Inrush (Soft starting reduces wear on system components and eliminates inrush during startup)
• Control of Cost and Return on Investment (Guaranteed quick payback of new system investment)

Power savings using a VFD can be significant. When using conventional across the line starting, inrush current during startup will be 6 – 7 times motor running amps. Power companies analyze these spikes and their frequency and charge customers for these spikes. By using a Variable Frequency Drive these spikes are eliminated by softly starting equipment. This aspect is but one of the benefits of using a VFD.

More significant power savings can be realized by using the Variable Frequency Drive to control the vacuum pump based on demand. When demand for vacuum decreases, the VFD will reduce the speed of the vacuum pump, which in turn significantly reduces the power consumption.

EXAMPLE: In a facility operating a 40HP vacuum pump system with Variable Frequency Drive on two shifts, let us assume the system would be running at maximum load for only 50 % of the time. The VFD would be in operation the rest of the time at maximum turndown, resulting in reduced power consumption of 50 %. A 40HP vacuum pump system with VFD yields the following results: Two shifts a 8 hours each is 16 hours per day. With a 6 day work week we have 96 hours per week or 4,992 hours per year.

BEFORE A VFD: Using normal across the line starting Power Cost = HP/motor efficiency) x 0.746 x ($/kWh) x (hours per year) Assuming a motor efficiency of 93% and a utility rate of $0.10 per kilowatt hour Power Cost = (40/0.93) x 0.746 x ($0.10) x 4,992 = $16,017 annual cost.

WITH A VFD: 50% of the time the pump will be operating on maximum load or 40HP. Power cost is 50% of above number or $8,008 The other 50% of the time, the pump would operate at 20HP Power cost = (20/0.93) x 0.746 x ($0.10) x 2,496 = $4,004 Total annual cost using a VFD is $8,008 + $4,004 = $12,012

Power cost savings realized is $16,017 - $12,012 = $4,005 yearly

RETURN ON INVESTMENT: If we also consider the power savings resulting from elimination of inrush, savings in power wire sizing and savings on protection equipment, the return on investment on a new system with the additional cost of the VFD is one year or less.

UPGRADE YOUR SYSTEM: VFD's are also affordable and easy to install on existing systems and are one of the most cost-effective ways to maximize efficiency and reduce operating costs.

Application engineers at Dekker Vacuum Technologies offer unmatched expertise, based upon years of experience in the vacuum industry and are available to answer any questions you may have. Please call us at 1-888-925-5444.