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The drive for productivity leads to controlled start transmission systems.


Maximum Input Speed (motor speed) 1,500 rpm @ 50 Hz (1,800 rpm @ 60 Hz) 1,500 rpm @ 50 Hz (1,800 rpm @ 60 Hz) Less
Weight (without oil) - In-line Drive System 16094.0 lb 7300.0 kg Less
Maximum Output Torque for a Short Duration (3 sec.) 479415.0 ft-lb 650000.0 N·m Less

Typical Application

Description Chain Type Longwall Machinery like Armored Face Conveyors (AFC) Chain Type Longwall Machinery like Armored Face Conveyors (AFC) Less

Maximum Output Torque (for 3 sec) Tmax [N·m]

KP-65 CST/P-65 CST 479415.0 lb ft 650000.0 N·m Less
Rated Power P @ 50 Hz (n = 1,480 rpm) - Ratio i [-]: 28 1200 kW 1200 kW Less
Rated Power P @ 50 Hz (n = 1,480 rpm) - Ratio i [-]: 33 1200 kW 1200 kW Less
Rated Power P @ 50 Hz (n = 1,480 rpm) - Ratio i [-]: 39 1000 kW 1000 kW Less
Rated Power P @ 50 Hz (n = 1,480 rpm) - Ratio i [-]: 45 900 kW 900 kW Less
Rated Power P @ 50 Hz (n = 1,480 rpm) - Ratio i [-]: 50 800 kW 800 kW Less
Rated Power P @ 60 Hz (n = 1,800 rpm) - Ratio i [-]: 28 1,958 hp 1,958 hp Less
Rated Power P @ 60 Hz (n = 1,800 rpm) - Ratio i [-]: 33 1,958 hp 1,958 hp Less
Rated Power P @ 60 Hz (n = 1,800 rpm) - Ratio i [-]: 39 1,632 hp 1,632 hp Less
Rated Power P @ 60 Hz (n = 1,800 rpm) - Ratio i [-]: 45 1,468 hp 1,468 hp Less
Rated Power P @ 60 Hz (n = 1,800 rpm) - Ratio i [-]: 50 1,305 hp 1,305 hp Less


KP-65 CST - Height 41.7 in 1060.0 mm Less
KP-65 CST - Length 114.6 in 2910.0 mm Less
KP-65 CST - Width 60.2 in 1530.0 mm Less
P-65 CST - Height 41.7 in 1060.0 mm Less
P-65 CST - Length 74.3 in 1887.0 mm Less
P-65 CST - Width 44.1 in 1120.0 mm Less

Requirements of Cooling Water

Maximum Water Inlet Temperature 25° C/298.15 K (77° F/298.15 K) 25° C/298.15 K (77° F/298.15 K) Less
Required Cooling Water Quantity 6.6 gal/min 25.0 L/min Less


KP-65 CST - Gearbox Weight (without oil) 23980.0 lb 10880.0 kg Less
KP-65 CST - Oil Quantity 211.0 gal 800.0 L Less
P-65 CST - Gearbox Weight (without oil) 16094.0 lb 7300.0 kg Less
P-65 CST - Oil Quantity 132.0 gal 500.0 L Less

Shaft Design

Input Shaft (cylindrical) DIN 5480-W 120×4 DIN 5480-W 120×4 Less
Output Shaft with Internal Toothing DIN 5480-N 320×10 DIN 5480-N 320×10 Less


For soft-start and heavy-load startup, all drive motors run up to full speed at no load. Motors are always started sequentially, with the result that peak current and energy demand are very modest. When the last motor has reached full speed, pressure is applied to the CST clutch, increasing until the breakdown torque is reached if needed. As a result, the increase in pressure and motor load is synchronized during the startup phase and continues as the conveyor accelerates.


Power consumption of each motor is constantly monitored to allow load-sharing between the individual drives. If a preset value is exceeded, slip at the drive with the greater power consumption is increased, causing the other drives to draw more power and equalizing power distribution again. The typical operating slip is normally below 0.2%.

Overload Protection

If the chain is jammed by large pieces of rock or trapped iron, the CST clutch is opened rapidly and the motor is switched off. To achieve this, the output speed is constantly monitored. Within milliseconds, the rotating mass of the gearbox - and particularly of the asynchronous motor - is disconnected from the conveyor chain sprocket. Communication between the drive control units allows all clutches to be opened simultaneously.

Motor Braking Feature

Occasionally - even during regular shifts - there is a need to interrupt production and shut down the AFC motors.

PMC™-D and PMC™-V

The PMC™-D and PMC™-V are members of the Cat PMC™ family of programmable mining controls. The PMC™-D controls drive applications such as face conveyors and overload protection gearboxes. The PMC™-V drives visualization.

V-Drive Visualization Software

This software visualizes all CST, tail drive and chain tensioning data. It allows changes to drive system parameters and monitors load-sharing, conveyor speed, clutch sensors, etc.

Field Experience

The CST drive system was applied for the first time in 1995 on a high production longwall face in the United States. Since then, well over 500 CST drive systems have been sold and are operating successfully in mines in the U.S., Mexico, Australia, Poland, China, Russia, Kazakhstan, the Czech Republic and Germany. The maximum total available power for the face conveyors is currently up to 3600 kW. All components - particularly the vital components within the supply unit and the CST clutch - have proven their reliability in a range of applications. The world’s highest capacity AFC (>6000 t/h) and the world’s longest AFCs in operation (nearly 500 m/1,640 ft) have been equipped with the Cat CST drive system.

ICDS - Integrated CST Drive System

The ICDS is the result of continuing cooperation between Caterpillar and Baldor Electric Company. It combines the tried-and-tested CST drive system for face conveyors with a newly developed special Baldor Electric motor with our new PMC™-D drive control system.

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