ASCO JOUCOMATIC NUMATICS News - Digital controller for proportional solenoid valves

THE DIGITAL CONTROLLER

What is the ?

The is a PID controller that makes any solenoid valve "intelligent", the choice of solenoid valve depending on the user's application (from among the 601, Posiflow, Preciflow solenoid valves etc), and on the installation, which may be in a critical environment.

Operating principle

working diagram for the digital controller

The can control 2 loops in the same manufacturing process, whether they are open, closed or double (cascaded). For instance:

In an open loop: the adjusts the valve's pressure or flow rate (without a sensor) by measuring the feedback value.

Open loop working diagram for the digital controller

Types of applications: air-cooling, inert or combustible gas feed etc

In a closed loop: the continuously compares the set pressure or flow with the set point thanks to a signal emitted by the sensor. The benefits? Very precise control (hysteresis of 1%) that reacts to external interference.

Closed loop working diagram for the digital controller

Types of applications: proportioning (in food-processing), brake pressure, tightness test etc.

In a double loop (with 2 sensors): the first loop adjusts the valve's pressure or flow for optimum control, while the second loop returns the signal of the relevant feedback value (pressure, position, force etc). Because the process's response time is integrated into the control process as a whole, the latter is more stable.

Double loop working diagram for the digital controller

Types of applications: force or cylinder positioning control, controlling high-pressure proportional valves, furnace temperature etc

*PWM: Pulse Width Modulation- : Comparator

Optimum adjustment with DigiCom

With the DigiCom software and the USB interface, one can now optimally adapt the controller to the control loop.
This user-friendly software features:

very fast adaptation of set point parameters, which are easily reproduced,
parameter adjustments (set point, zero offset, ramp function etc),
valve diagnosis: save factory or user-defined settings,
optimisation of the .

Thanks to the software's SCOPE function, the operator can monitor control loop performance continuously in real time.

Download the DigiCom software (zip file - 12 MB)
Download the USB port driver (zip file - 3,5 MB)

Moreover,

The is very ergonomically designed: settings can be adjusted via 3 buttons on the front panel, one of which is assigned to the auto-adapt function (automatic adjustment of the CONTROLD control device to the control valve), digital readout of the set point value, a LED displaying the status of diagnosis functions.

Technical data

IP 20
PC connection: USB or RS232 (option)
Voltage: 12/24 V CC +/- 10 %
Electrical connection: screw terminal board
Maximum current: 2 A
Analog set point: 0-10 V, 0-20 mA, 4-20 mA
Frequency: from 20 to 2000 Hz (adjustable)

Documentation

Digital controller on proportional solenoid valve control
All our documentation on proportional pneumatics
View our online "Proportional Technologies" catalogue

For more information, please contact:
ASCO JOUCOMATIC NUMATICS
32 Avenue Albert 1er
BP 312
92506 RUEIL MALMAISON Cedex
France
Tel : (33) (0)1 47 14 32 00
Fax :(33) (0)1 47 08 53 85
E-mail : webmaster@ascojoucomatic.fr