Application 7
Application 7
Application No.7 - Handling Systems
Application No.7 - Handling Systems
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This application deals with the control of systems which transfer blended materials from day bins/silos/big bag stations/box stations to process machinery. In most cases, the process machinery has been plastic extrusion machines, extruding window profile, guttering, ducting, facia boards etc.
The project involved circuit design, plc and hmi application software, and site commissioning.
Key components:- Mitsubishi AnS series PLC, Beijers E series hmi
Please scroll down to see more detail of the application
What the plant does
The purpose of the system(s) is to maintain a steady feed to a group of extruders, ensuring they never starve off through lack of available material.
There is a vacuum hopper above each extruder with a normally open discharge valve at the bottom. Apart from when the hopper is filling, material is "chicken fed" down to the extruder.
The control system constantly scans around the extruders to see which vacuum hoppers need topping up, and does so accordingly. Should the hopper fail to fill during the fill period, an alarm would be activated, indicating that there is potentially a problem with the material source (silo). Alarms are also activated if an exhauster fails, or if the vacuum in the transfer line reaches too high a level.
Which extruders are fed from which source is set up via the hmi.
The slideshow above shows photos of several similar plants that PJC Systems have controlled. We have developed several systems for plants feeding materials to production machines.
In most cases the systems have been feeding either powders or pellets to extrusion lines.
A couple of the larger systems have been feeding:
14 sources to 35 extruders, and
36 sources to 37 extrusion lines
The slideshow to the right shows some typical hmi screens that PJC Systems have designed for this sort of system. In each case, the screens depict the status of all aspects of the plant, and generate appropriate alarms.
Certain system times and parameters have been made available to the operator to adjust under the correct password level.
Sytem set-up (ie which machine is fed from which source) is also available to the operator.
These are some of the panels PJC Systems have built to control handling systems.In each case, the terminal blocks are grouped such that a block of adjacent terminals connect via a multicore cable to an individual machine/extruder; this makes maintenance/fault finding as logical as possible. The largest panel we have built for this type of system has been 2,400 wide x 1,900 high (including a 100mm plinth) x 400 deep
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