2
0
1
8
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6
8
Product Description
2
Product Description
2.1
Use and Application
Zero Pressure Accumulation (ZPA)
During zero pressure accumulation, conveyed product is moved along a conveyor line in a
controlled manner and collisions between the conveyed product is prevented. For this purpose,
a conveyor line is divided into several sections or zones.
Each zone has its own drive, which can be activated independently of the neighboring zones.
At the end of each zone, a zone sensor is installed that detects the conveyed product.
The accumulation conveyor logic ensures that there is only ever one conveyed product present
in a zone. Conveyed products can therefore only be conveyed to the downstream zone once
there is no more conveyed product in that zone. As long as the downstream zone is occupied,
the conveyed product is stopped when it reaches the zone sensor and thus accumulates
irrespective of subsequent conveyed product.
Figure 2.1
Conveying scenario for the example Standard ZPA operation mode
Benefits and Features of the ZPA Motor Control Module
The ZPA motor control module is easy to install and can be configured for a wide range of
application situations. The main benefits and features of this module are:
■
Compact housing for direct mounting in support profiles and cable ducts.
■
Connection of the power supply using piercing technology via black AS-Interface flat
cable.
■
All other connections are implemented as connectors.
■
Decentralized control: The field module contains the logic for zero pressure accumulation.
A central control unit for the accumulation conveyor line is not required.
■
Support for master-slave operation
■
Control of two successive zones of an accumulation conveyor line using one module.
■
Simple adjustment of the operating mode, the conveyor direction, the motor speed, and
start/stop ramps via rotary switches.
■
Display of status and diagnostic information via LEDs.
■
Optimized for operation with DC roller motors type Interroll EC310.
■
Support for conveyed product that is longer than one zone.
■
Detection of accumulations leads to shutdown of the DC roller motors.
Zone
Upstream
zone
Downstream
zone
Roller motor
Zone sensor
Conveying direction
