300/165 Ton Top Running Double Girder Crane

300 ton crane for overhead

300 ton crane for overhead

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