| Engineered
Lifting Case Study May 20, 2008
Magnetek’s “Ultra-Lift”
Hoist Control with Ace World Trolley-Hoists
Recently,
Engineered Lifting Systems completed a multiple crane project for a
large Midwest steel supply company. The cranes are used for the
loading and unloading of many different sizes, shapes and bundles of
steel from trucks and rail cars. The cranes are primarily operated
by cab, and at times during the day the speed at which these cranes
can perform becomes critical when dispatching trucks to their
customers.
Since these cranes were used for loading and unloading, there was at
least 50% of the time that the hoists had a light or no load lift or
lower condition. Looking for a faster hoist speed, we suggested the
customer specify and purchase Magnetek’s “Ultra-Lift” Hoist control.
Mr. John Walters of Magnetek states “Based on motor torque and
proportional to load, you can set the drive to over speed a normal
1200 rpm inverter duty hoist motor from 1200 rpms at 60 hertz to
1800 rpms at 90 hertz; normally setting the limit for the operation
around 40% of full load.”
This means that with a load of less than 40%, the motor can be
over-sped to obtain 1/2 more speed. A 30 fpm hoist under a heavy
load becomes a 45 fpm hoist with light or no load operation.
Quality factory built crane panels from Magnetek! Very Nice!
The key to using this control is not only the VG+ Series 3
Magnetek Drive, but also the Hoist machinery. Working
closely with Mr. Rick Reeves from Ace World Companies
located in Fort Worth, Texas, we were able to specify a 6
pole 1200 rpm inverter duty motor, along with an Ace A50
gearbox that was capable of taking an over-speed input up to
1800 rpm. Not every gearbox can be used with Ultra-Lift.
7-1/2 ton hoist unit, more than ready for Class D service!
When you are looking for more speed
from your crane production, make sure to call Engineered Lifting
Systems for your options.
As
always, we really appreciate the business and support all of you
provide us. If we can do anything for you,
please
contact Engineered Lifting.
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