Marine Log - August 2008 - (Page G5) ADVERTISING SUPPLEMENT How does a winch go “green”? here’s no direct consumption of petrochemical fuels.There are no toxic environmental emissions. So, how DOES a winch go green? For over 100 years, Markey has been innovating and producing the highest quality deck machinery for commercial and scientific applications. Now, the latest landmark addition to its historic line is the Type DEPGF-42 Render/Recover™ “Green” Hawser Winch.This is a development that ingeniously directs generated usable energy back to the tug’s power source. Typical hawser winch drives extract 460 vac, 3 phase, 60 hertz of power, producing a significant amount of heat energy during operations. Used in conjunction with a hybrid tug, the DEPGF-42 seamlessly shares power with the tug’s DC bus. During hawser pay-in direct current power is sourced by the variable frequency drive produc- T ing motor torque and speed like a conventional Markey hawser winch.When paying out the line, using automatic Render/Recover during tug maneuvers, the AC vector drive electronically monitors and counteracts the overhauling force to maintain control over the load.The force required to electrically brake the motor produces a corresponding amount of electrical energy.The advanced DEPGF-42 drive feeds this excess power back into the DC bus. There it is. Conserve usable energy while in the process of performing your work. It doesn’t get any “greener” than that! If you’re interested in “Going Green” and looking to reduce overall vessel operating costs, contact Markey President, Blaine Dempke at: 1800-637-3430 x229. Discuss how Markey can help improve your bottom line. www.marinelog.com AUGUST 2008 MARINE LOG G5 http://www.markeymachinery.com http://www.markeymachinery.com http://www.marinelog.com
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