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Description of the unit Typical positioning W.E.ST. Elektronik GmbH This module supports the simple point-to-point positioning with hydraulic drives. The system works with the principle of stroke depended deceleration, that means the control gain will be adjusted with the parameters D:A and D:B. The deceleration characteristics can be defined with the parameter CTRL linear (LIN) or nearly square root (SQRT1). By use of standard proportional valves, SQRT1 has to be chosen normally. By use of control valves with linear characteristics, it depends on the application. If you choice LIN, a shorter deceleration stroke can be set (D:A and D:B). Sequence of the positioning: The positioning process will be controlled by switching inputs. After enabling (ENABLE input), the command position is set to the actual position of the sensor and the axis is in closed loop position control mode. The READY output indicates a general ready for operation. With START input, the analogue command input (Pin 13) is active and new command positions will be taken over. The axis is immediately driving to this new position and indicates, with the InPos output, when the axis is in position. The InPos output is active as long as the axis is within the InPos window or the START input is active. The axis can be driven in manual mode (START is off) with the digital inputs HAND+ or HAND-. The programmed velocity (parameter HAND) is used. When the HAND inputs are switched off, the command position is set to the actual position and the system is in closed loop position control mode. Weak points of positioning accuracy: The positioning accuracy will almost be limited by the hydraulics and mechanics. Therefore, the correct valve selection is the most important point. Additionally, two contradictory requirements (short positioning time and high accuracy) have to be considered in the system design. v+ v- MAX:A A:A D:A D:B Volumenstrom P-A und B-T Regelrichtung Ausfahren Regelrichtung Einfahren MAX:B Seite 6 von 24 A:B
In- and outputs W.E.ST. Elektronik GmbH Terminal Description of the analogue inputs and outputs PIN 9/10 External command speed (V), range 0… 100 % corresponds to 0… 10 V PIN 6 - PIN 13 Command position (W), range 0… 100% corresponds to 0… 10V or 4… 20 mA PIN 14 Actual (feedback) value (X), range 0… 100% corresponds to 0… 10V or 4… 20 mA PIN 15 / 16 Differential output (U) ± 100% corresponds to ± 10V differential voltage, optionally (I-version) current output ±100% corresponds to 4… 20 mA (PIN 15 to PIN 11) Terminal Description of the digital inputs and outputs PIN 8 Enable input: This digital input signal initializes the application. The analogue output is active and the READY signal indicates that all components are working correctly. Target position is set to actual position and the drive is closed loop controlled. PIN 7 START (RUN) input: The positioning controller is active; the external analogue command position is taken over as command value. If the input is switched off during movement the command position is set to the actual position plus a defined emergency deceleration stroke PIN 6 HAND+ input: Hand mode (START = OFF), driving with the programmed velocity. After deactivation the actual value is taken over as command position. PIN 5 HAND- input: Hand mode (START = OFF), driving with the programmed velocity. After deactivation the actual value is taken over as command position. PIN 2 STATUS output: Monitoring of the control error (INPOS). Depending on the INPOS command, the status output will be deactivated, if the position difference is greater then the adjusted window. The output is only active if START = ON. PIN 1 READY output: General operationality, ENABLE is active and there is no sensor error (by use of 4… 20 mA sensors). This output corresponds with the green LED. LED Function LEDs Description of the LED function GREEN Identical with the READY output. OFF: No power or ENABLE is inactive. ON: System in process FLASHING Failure detected (internal or 4… 20 mA). Only if SENS = ON. YELLOW Identical with the STATUS output. OFF: Control error depending of the error parameter. ON: No control error. Seite 7 von 24
Page 1 and 2: W.E.ST. Elektronik GmbH Technical d
Page 3 and 4: Revisions W.E.ST. Elektronik GmbH D
Page 5: General installation remarks Explan
Page 9 and 10: Typical wiring PLC Inputs PLC Outpu
Page 11 and 12: W.E.ST. Elektronik GmbH General IO
Page 13 and 14: W.E.ST. Elektronik GmbH As current
Page 15 and 16: Parameter table W.E.ST. Elektronik
Page 17 and 18: D (deceleration stroke or braking d
Page 19 and 20: W.E.ST. Elektronik GmbH TH (Stroke
Page 21 and 22: INPOS (in positioning window) W.E.S
Page 23 and 24: W.E.ST. Elektronik GmbH Appendix: P

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