Why Electric Drive? -
Cat® mechanical drive trucks are the standard of the industry and are favored in most applications. Some customers, however, may prefer electric drive for specific applications and situations.
100% Caterpillar -
Designed and manufactured by Caterpillar, the 795 is the first AC electric drive truck that is single sourced from one manufacturer and supported with the best dealer network in the industry. The 795 power train works seamlessly with the C-175 engine and offers you unsurpassed Safety, Serviceability and Performance.
Modular Design for Excellent Serviceability -
The modular design allows you easy removal and installation of components. The engine, generator, motors, inverter, grid, and final drives can be removed independently. The rear mounted generator results in better chassis weight balance and is connected to the engine with an isolated drive shaft making generator alignment simple.
Superior Control Yields Excellent Operator Confidence -
The Cat AC drive system gives you the best retarding, braking, and control in the industry. Class leading dynamic retarding coupled with full time traction control with automatic front brake blending at all speeds provides operators with superior control and confidence.
High Voltage - Lower Heat -
The Cat AC drive is a high voltage system (2,600 volts) that operates at relatively low current. The result is lower heat generation and longer component life.
The Cat AC Electric Drive in Propel -
The C175-16 diesel engine drives the rear mounted generator through an isolation coupler. The AC power is rectified to a nominal 2,600 volts to form the DC link. The DC link supplies power to the inverter where IGBT's convert the DC signal to 3-phase AC to drive the traction motors. Motor output drives the wheels through a double reduction final drive.
Cat AC Electric Drive in Retard -
During retarding the wheel motors become generators. Motor power is fed back through the DC link. The power is fed to the contactor and chopper circuits and then exhausted through the radial grid. An AC fan blows air across the grid to dissipate the power and control retarding speed.
Generator/Alternator -
The chassis mounted 795F AC traction generator is a three phase, two bearing design. The excitation system is brushless which has longer maintenance intervals than brush type systems.
Inverter -
The inverter uses Mitsubishi Electric IGBT Phase Modules to control the rimpull, direction and speed of the truck. Mitsubishi Electric is the leader in IGBT Technology.
Traction Motors -
Each traction motor is a 3-phase AC induction type. The high voltage, low current motor is mounted to the rear axle and is trolley capable.
Radial Grid -
The radial design grid sits well back on the deck giving operators excellent visibility to the right side. The grid features the highest retarding power in the industry.
Variable Blower Cooling -
Cooling air is provided by a variable flow system that adjusts cooling flow to the needs of the system. This allows maximum power to the motors for excellent propel performance.
The grid dry function dries the grid quickly in inclement weather. The anti-rollback feature prevents the machine from moving in a direction opposite the operator's intent. Grid power is continuously monitored. Front brake blending prevents grid overheating.
