DC to AC Drive Conversion on Whirley Crane

Washington Iron Works 24-90 Drive Upgrade
Alatas ServiceSystem Upgrades
Product TypeWhirley Crane, Drive Upgrades
Crane ManufacturerClyde Iron Works
Crane Model28 | SWL 100 tons

The Alatas team in the US performed DC to AC drive conversion on a Whirley crane by Clyde Iron Works. Read this Job Report to find the full scope of all of the work that took place.

DC To AC Drive Conversion on Whirley Crane Details

The following drives were upgraded:

– Hoist
– Travel

Magnetic drives were utilised and standardisation was key in determining which drives were selected as customer uses magnetic
drives throughout the facility.

Operator Control Upgrades

The operator controls were upgraded to increase safety, efficiency and control of the machine as the machine operates as if it was not a friction crane.

PLC Upgrade Details

A modern PLC and HMI were added to compliment the drive upgrade package. The PLC controls the inputs into the drives, brakes, clutches and other critical components to ensure full and safe control. The PLC logic adheres to the most updated ASME standard for crane control requirements.

The HMI provides a visualization & function activation to the operator for the following:

  • Current system alarms
  • Status of locking dogs/pawls
  • Status of clutches
  • Status of brakes
  • Status of auxiliary systems
  • Status of current inputs & outputs

A load monitoring system was added for increased safety for all personnel involved with lifting operations. It displays the SWL of the crane at the radius in which the boom is currently positioned. It shows the actual hook load when loads are lifted.


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