Head drive
The head drive is located on the discharge end of the conveyor as standard and pulls the transport medium. If you have location restrictions, you can also install the drive on the infeed end to push the transport medium. In this case, belts require a higher pre-tension to prevent the belt from kinking.

	AC – indirect head drive With power transmission via chain or timing belt, the indirect drive enables a wide range of motor, gearbox and sprocket wheel combinations as well as fine speed gradation.
	AS/AU – indirect head drive, external on the side The indirect drive with the external motor mounted on the side keeps the space above and below the conveyor free and allows for flexible motor, gearbox and sprocket wheel combinations as well as fine speed gradations.
	AF – direct head drive With the direct drive, the motor is connected directly to the drive shaft, resulting in a particularly compact and low-maintenance design.

Centre drive
Centre drives, also known as lower belt drives, are arranged below the transport level in various locations, usually in the centre. They can be used to enable reverse operation, since the transport medium is always pulled and thus difficult pushing is avoided. Fixed installation lengths are available and a knife edge can be installed at the infeed and discharge ends.

	BC – indirect centre drive The indirect centre drive offers flexible motor, gearbox and sprocket wheel combinations, fine speed gradation, reverse operation and the option of installing knife edges at the infeed and discharge ends.
	BF – direct centre drive The direct centre drive offers a particularly compact and low-maintenance design as well as the option of reverse operation and knife edges at the infeed and discharge ends.

Internal drive
Internal drives with a drum motor produce few obstructing edges, making them particularly popular for applications with limited installation space. They are also popular in clean environments, since they feature low particle emissions and have few surfaces on which dirt can deposit.

CA | CB – internal drive with drum motor The maintenance-free and compact drive version with drum motor has minimised obstructing edges and low particle emissions, making it particularly suitable for tight installation conditions and clean environments.

Operating modes

The configuration of the drive and the motor selection depend on the duty type.

Continuous operation
In continuous operation, the conveyor and the products run without interruption. The goods to be conveyed are fed onto the running conveyor.

On/off operation
In on/off operation, the conveyor is switched on and off up to four times per minute as required, e.g. to feed in parts or for manual removal.

Cycle operation
Cycle operation usually takes place in fixed, repeating cycles. For operation with over 30 cycles per minute, servo drives are usually required. More than 60 cycles per minute are possible on request. The required repeatability and positioning accuracy play a key role:

• ±10 mm: with simple sensor systems such as initiators or photoelectric sensors
• ±5 mm: usually with positive drive mechanism and closed-loop controller
• ±1 mm: at the boundary to linear technology

Accumulated operation
In accumulated operation, the conveyor continues to run underneath the accumulated products. The drive works against the friction of the stationary products, which requires twice as much motor power.

Running direction and reverse operation

• One running direction: The conveyor always transports the product in one direction only.
• Reversing: The conveyor runs in one direction, but can be reversed by one belt length, e.g. for positioning.
• Two running directions: The conveyor is designed for continuous operation in both directions.

Speeds

The maximum conveying speed depends on the motor selected, the load on the belt, the duty type and other factors. The speeds provided here are nominal values and may deviate by -10% to +20% due to the speed tolerances of the motors. Higher speeds are also achieved when the system is operated on a 60 Hz grid (for example, in the USA).

The speed can be precisely defined using a frequency inverter (three-phase current) or reglomat (direct current). The adjustment range is as follows:

• Three-phase current: in the range from 10 to 70 Hz (1:7) based on a nominal speed at 50 Hz; 20 to 60 Hz (1:3) for drum motors
• Direct current: 1:6 (0.25–1.5 A or 0.5–3 A)