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2022 Caterpillar Draglines 8750

Offering the highest levels of overburden removal productivity at the lowest total cost per tonne (ton), the 8750 is the flagship model of the Cat dragline product line. The first dragline of any kind to be successfully equipped with AC IGBT drive systems, we developed this superior technology for the sole purpose of making your workday more productive, predictable, and most importantly, safe.

Features may include:

• You will experience greater machine uptime, lower operating costs, and faster cycle times with our AC dragline designs that leverage institutional knowledge built on 30 years of experience commissioning more than 200 AC equipped machines worldwide.

• Superior availability – Routinely demonstrated electrical availabilities of greater than 95%. – Extended mean time between failures, and reduced mean time to repair.

• Better reliability – Less vulnerable to input voltage variation. – No filters, robust design, independent of mine network. – Full power available with voltage ±10%. – Continues to operate with reduced power with voltage –10% to –30%.

• Greater efficiency – Provide up to 10% energy savings over the life of the dragline. – AC drives have an overall efficiency of 92% vs. DC machines of 88%.

• Less maintenance – No regular maintenance is required on IGBT power control modules – Motor maintenance is reduced to greasing and replacing bearings around 30,000 hours. – Reduced maintenance resulting from lack of motor and generator brushes requiring change-out. This translates to increased machine electrical availability and reduced maintenance labor costs.

• Reduced inventory – IGBT modules are interchangeable between Active Front Ends (AFEs), inverters, motions and machines. – No brush inventory to maintain.

• Optimizing your AC system performance and reliability, we've incorporated the latest in AC technology and utilized the most durable components available.

• Sturdy, mine-grade cabinet mounted on a self supporting steel structure encloses all power and control electronics.

• AFEs, rather than rectifiers, convert AC to DC power.

• Fuseless IGBT modules in AFEs and inverter.

• Onboard maintenance computer is easy to troubleshoot, quickly identifies faults, and provides instructions to resolve issues.

• Major control and power electrics are derived from the transportation sector, allowing for high temperature ratings, shock and vibration ruggedness, and longevity of component availability.

• IP 54 enclosure – liquid cooled, heat transferred out of machinery house.

• Cabinets allow optimized cable routing.

• Cable internals organized to allow efficient access to internal components.

• Staggered Active Front Ends (AFEs) naturally cancel harmonics without filters, which makes the dragline very robust and independent of mine network configuration.

• Provides better Total Harmonic Distortion (THD) than required by IEEE 519.

• Rated at 24 kV.

• Provides programmable protection and control for Auxiliary Power Transformer (APT) and Drive Power Transformer (DPT).

• Internal and key interlocking provides for safe operation.

• Simple, AC squirrel-cage induction motors power swing, hoist, drag and propel motions.