Caterpillar reported it updated the AC electric drive system for the 7495 and 7495 HF Electric Rope Shovels, which ensures greater reliability, improved maintenance access, enhanced safety, and expanded ability to operate in extreme environments.
Updates include a liquid-cooled motion regulator cabinet for more efficient dissipation of heat. The new system enables shovels to operate at temperatures of -40° to 50°C, and at altitudes of 5,250 m without derating. The system also eliminates airborne contaminants in the cabinet and lengthens service intervals. A faster propel transfer switch cuts lag time by 75%.
New technologies enable consolidating two cabinets in the machinery house to create space for easier maintenance access.
The drive system design uses common motors in multiple applications. The new motors have higher power densities, smaller frame sizes and optimized footprint, which aids access, Cat reported.
The new electric drive system will be on all new production 7495 and 7495 HF shovels beginning in late 2020.