Application notes Ascon Spa

Application notes
Ascon Spa
Plastic industry (disposable kitchenware). Raw material extruders and rollers.
The extruder analyzed in this application provides the raw material for the half of the
customer’s production and is controlled by Deltadue and GammaDue products from
Ascon. An accurate control during this phase contributes to meet the high-precision
PP/PET sheet demand.
The sheet line has been developed in house by the customer for the manufacture of thin
monolayer film necessary to supply the factory with the raw material to be formed into
cups, containers, bowls, plates and trays.
Two main sections form the extruder: the extrusion part and the rollers. Deltadue and
GammaDue Ascon controllers control both parts while a Modicon PLC manages the
complete machine automation thru Modbus communications. A Touch screen panel that
accesses to all the machine parameters provides the interface to the operator.
Diagram of the connections:
MODICON PLC
M4
Gammadue
TOUCH SCREEN
D1
Deltadue
I/Os
I/Os
Rollers
I/Os
Extruder
The Deltadue PID controllers, model D1, are controlling the temperature in the 21 zones of
the extruder (one controller for each zone) through power control units. They receive the
working parameters and the set points from the Modicon PLC through the embedded
RS485 Modbus interface. A dedicated GammaDue PID controller, model M4, controls the
water temperature in each roller cylinder.
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This configuration allows the PLC to execute only logical and automation operations while
the PID loop control is done by dedicated and more effective devices as the D1 and M4
controllers saving a lot of complex programs and execution time in the main CPU.
Cabinets and the related machine controlled parts
Rollers cabinet
Rollers water line
Main cabinet
Rollers
Extruder
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Deltadue PID controllers, D1 model.
The D1 controllers include a unique common bus for RS 485 Modbus communications and
24DC power supply, up to 3 relay outputs, a universal input signal for temperature input,
an auxiliary current transformer to manage power controllers and digital inputs to directly
execute internal functions.
Customer was particularly satisfied by the behavior of the units in case of fault, as a matter
of fact the electronic part may be easily withdrawn and replaced and all the terminal blocks
are removable and polarized in order to avoid any wrong rewiring. These characteristics
made the replacement time very short thus decreasing the production shutdowns.
Future lines will consider the use of the Ascon’s SigmaPAC series of Programmable
Automation Controllers (PACs) and I/Os to replace the PLC.
Customer: http://www.saykap.com/ (Turkey)
EVERYTHING UNDER CONTROL
ASCON Spa
Via Falzarego, 9/11
20021 Bollate (Milan) Italy
Tel + 39-02-333371
Fax + 39-02-3504243
E-mail [email protected]
www.ascon.it
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