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Engineered
Lifting Case Study
February 29, 2008
Magnetek Crane Modernization for Coil
Handling Cranes
After securing emergency parts from Germany
for a new customer (see
Coupling Inserts Found!), Engineered Lifting Systems was
selected to put two 25-ton cranes back into active coil handling
service for them. Working with the customer and Magnetek
Engineering’s Wayne Goodspeed, we developed a plan to provide
quality Magnetek Crane controls for all motions by building
backplates to fit inside the existing enclosures with pre-wired
controls on those backplates for each motion. The old backplates
with controls were simply removed, and the new backplates were
bolted back in place!
The old controls were a mixture of Filnor Static Stepless Hoist
control, and some industrial grade variable frequency drives. The
existing hoist motors were of course wound rotor motors, but these
can easily be used with a Magnetek Series 3 VG+ drive by tying the
ring leads together. The motor performance is not as good as a
squirrel cage motor, but more than adequate for coil handling.
Old Filnor Static Control
-Changed to-
New Magnetek VG+ encoder feedback hoist control, with Dynamic
Braking Unit, and load reactors for existing would rotor motors
Old traverse drive with relays for speed control
-Changed to-
New G+ Bridge control
Old Encoder set-up. Note: spliced encoder wire, and misaligned
encoder with “hose coupling”
-Changed to-
New 5/8” Shaft mounted 1024PPR Mill Duty Avtron encoder
Finished Crane!
A couple of important things to
remember for those of you performing a conversion to Flux Vector, or
if you are having nuisance trips with your existing system.
The encoder cable between the drive and the encoder should be splice
free, run in it’s own conduit separate from Power or control wires,
and make sure to use “stand-offs” in the festoon as shown in this
modernization picture below. (green arrow)
This will prevent magnetic fields
from the other conductors from interfering with the signal from the
encoder to the drive, reducing nuisance faults and resets.
I want to thank Joe W. and Mike H. for giving us an opportunity to
perform on this project. Prop’s go to Wayne Goodspeed and Mark
Henschel from Magnetek for their attention to detail. And of course
the project was brought together by our Dane Vance and Tim Dorenkamp
who provided a fantastic installation.
If you have questions on Crane Modernizations, make sure and contact
the Crane Doctor, Eric Brown. Call us today!
Contact
Engineered Lifting today to discuss your installation requirements
for your engineered lifting applications! |
