zero pressure ZP50 conveyor

Zero Pressure Conveyor is compatible with a wide range of products manufactured by Peer Conveyors.

The conveyor is fitted with Panasonic 'mini motors' or Itoh Denki driving rollers along its length to enable the loads to be automatically controlled in 'zero pressure zones'. The stop / start action of these motors is automatically controlled by photocells fitted adjacent to each motor that send information to the onboard ASI control system. As the loads are conveyed along the conveyor, the photocells inform the control system that product is present. The control unit then checks that the forward zone is unoccupied. If the zone is clear, the downstream motor starts thus enabling the product to be passed forward where the action is repeated. If however, the downstream zone is occupied then the control system stops the motor immediately under the product until the downstream zone is clear.

In the event that no loads are present or moving on the conveyor, then zones are stopped effectively saving energy.

Side Frames

180mm x 45mm x 2mm sheet steel C section with return flanges to facilitate accessories and services. The section is precision pierced to retain rollers and cross ties, together with holes in the bottom flange for support fixings. Paint finish - blue RAL 5015.

Zero Pressure Conveyor - On Board Controls

Each conveyor section would be factory pre-wired to suit the required zones, requiring ASI control linkage on site and connection to an ASI compatible PLC and including a PILZ relay.Motors are either small 240v single phase Panasonic motors, or Itoh Denki motorised rollers 24v DC.Motors require a linked supply connecting the onboard PSI controller.Sensors are the proximity type, vertically mounted on a cross tie. Variable width loads may require alternative sensors to give full effective width coverage.

ASI wiring, motor wiring and any necessary pneumatic piping may be run through the conveyor C section channel which can be effectively closed using Facia. This enables electrical installation to be carried out in a shorter period than experienced with conventional wiring systems.

The on-board controller consists of a node board either enclosed (with Facia) within the side frame (240V motors) or visible with indicator LEDs (24V). Each controller is capable of linking up to 4 zones - each zone may have more than one driving roller, depending on the application. Each driving roller is linked to adjacent slave rollers via elastomeric endless driving belts running in special grooves in the rollers.

Wiring Requirements

From the PLC control a 240v 3 wire cable is required (live, neutral, earth) to loop between each 4 zone controller. Any emergency stops will also require a 240v wire linked to each controller. A typical installation will comprise the ASI control wire, a 3 wire supply to motors, and an emergency stop wire, 24v motors.

In addition to the ASI control cable from the PLC, a further black cable (2 core) is required to link each controller for the 24v power supply via a power pack in the PLC panel. An emergency stop circuit can be looped around devices remote from the controllers.

Technical Specification of our ZP50 Conveyor >