Technical documentation - W.E.ST. Elektronik GmbH

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General description W.E.ST. Elektronik GmbH This module is used for the control of proportional valves with one or two solenoids (directional valves). Various adjustable parameters enable an optimized adaptation to the respective valve. The dynamic integrated power amplifier with a control/cycle time of 0,167 ms is inexpensive and a spacesaving solution. The power amplifier is controlled by an enable input and three switch signals. Therefore 8 demand values can be activated binary. In case of direct control (non binary) it is par example possible to preset the directions with two inputs and to switch over between rapid and slow speed with the third input. The output current is closed loop controlled and therefore independent from the supply voltage and the solenoid resistance. The current output is observed with regard to cable breakdown and over current (short circuit). Programmable are ramps, MIN and MAX, DITHER (frequency and amplitude) and PWM frequency. The adjustment via RS232C is simple and easy, so that a short training period can be guaranteed. Typical applications: Rapid and slow speed controls and digital selectable set points for pressure and flow rate values. Features • For proportional valves with one or two solenoids • Three switch inputs for the selection of 8 programmed demand values • Compact housing • Digital reproducible adjustments • Characteristic linearization via 10 XY-points per direction • Free parametering of ramps, MIN und MAX current, Dither (frequency, amplitude) and PWM frequency • Adjustment MIN / MAX in mA • Current range (per software adaptable): 1 A, 1,6 A and 2,6 A • Simple and application orientated parameter settings • Fehler Diagnostik und erweiterte Funktionsüberprüfung • Failure monitoring • Adjustments via RS232C interface Seite 4 von 22 12.03.2008
General installation remarks Explanation of terms and notes on safety Terms: W.E.ST. Elektronik GmbH w: command signal c: internal signal u: internal signal ia, ib: output current (not scaled, only for information) Mounting instructions This module is for the installation provided in shielded electromagnetic compatibility housing (EMC conform). All cables operating outside have to be screened. A complete shielding is presupposed. It is also presupposed, that no strong electrical disturbances near the module are installed. Typical mounting area: 24V control signal area (near PLC) By the arrangement of the electrical cabinet a separation between power part (and power cables) and signal part must be taken in consideration. Experience shows us that the area next to the PLC (24 V area) is suitable. All digital and analogue inputs and outputs have filters and an over voltage protection. In case of correct wiring and shielding all EMC demands are fulfilled. If there are nevertheless any problems, please send us detailed sketches of mounting and wiring. We will look after this problem immediately. Even if all EMC-norms are fulfilled, technical problems in special cases are possible. Our experience has shown us that most of these problems are caused in the physical conditions of the cables. If everything is shielded continuously and configured correctly, no problems have to be expected. ATTENTION! ATTENTION! Due to electrical disturbances, failure at components as well as software faults can cause in individual cases uncontrolled movements at the drive. Appropriate safety precautions have to be considered during the engineering. Connection and start up of the module may only be allowed by qualified persons who have, because of education, experience and instruction, sufficient acknowledge on relevant directives and approved technical rules. Please read and follow the operating instructions carefully. In case of non observance of the instruction the guaranty and liability claim expires. Seite 5 von 22 12.03.2008
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Page 3: Revisions W.E.ST. Elektronik GmbH D
Page 7 and 8: Block diagram Power supply 12 /24 V
Page 9 and 10: Technical Data Power supply Current
Page 11 and 12: W.E.ST. Elektronik GmbH Analogue in
Page 13 and 14: Parameter table W.E.ST. Elektronik
Page 15 and 16: Parameter description S (setpoint p
Page 17 and 18: W.E.ST. Elektronik GmbH Flow charac
Page 19 and 20: SENS (sensor monitoring) W.E.ST. El
Page 21 and 22: SAVE (data storing in EEPROM) W.E.S

Technical documentation - W.E.ST. Elektronik GmbH

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