Prior to this project, the best controls on the market were capable of 1,000:1 speed control. This means that the slowest controllable speed would be 1/1000 of the maximum speed. With a top speed of 120 fpm, the slowest controllable speed would have been 0.002 feet-per-second, far to fast to achieve the required incremental moves of 0.002 inches. Closed-loop-flux-vector controls with special pulse-counting software was utilized to achieve the client's desired control. Each motor was outfitted with an encoder and its own individual flux-vector drive.

300 TON CRANE FACTS: 300/165 TON TROLLEY HOIST FACTS: EQUIPMENT FEATURES:

Bridge Span:
75'-0"

Bridge Girder Depth:
10'-0"

Bridge Weight:
249,000 pounds

Bridge Drives:
4 @ 15 hp each with rotating axles

CMAA Class:
"D"

True Vertical Lift:
37'-0"

Trolley Gage:
24'-0"

Weight:
150,000 pounds

Main Hoist:
150 hp

Auxiliary Hoist:
125 hp

Trolley Wheels:
8 @ 24" diameter

Trolley Drives:
2 @ 15 hp each with rotating axles

Profile:
48" over bridge low- headroom design
  • Bridge and hoist service platforms
     
  • Horizontally-split gear boxes
     
  • Encapsulated bearings
     
  • Oversized load hooks
     
  • All gearing enclosed
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