DaS Program – HELP FILE Version 6.1 CONTENTS 1. INSTALLATION PROCEDURE 3 1.1 GETTING STARTED 3 1.2 HOW TO CONNECT THE SENTRONICD 3 1.3 GENERAL RECOMMENDATIONS 3 1.4 HOW TO OPERATE THE SENTRONICD 3 2. HOW TO OPERATE THE DaS PROGRAM 4 2.1 HOT KEYS 4 2.2 MAIN MENU 4 2.2.1 PROJECT MENU 4 2.2.1.1 NEW PROJECT… (unknown.das) 4 2.2.1.2 OPEN PROJECT… (*.das) 4 2.2.1.3 SAVE PROJECT (current project, current path) 4 2.2.1.4 SAVE PROJECT AS… (*.das) 4 2.2.1.5 PROJECT INFO 4 2.2.1.6 PRINT PROJECT… 4 2.2.1.7 SERIAL PORT 4 2.2.1.8 EXIT 4 2.2.2 PARAMETER MENU 5 2.2.2.1 PARAMETER SETTINGS 5 2.2.2.2 PROJECTED PARAMETERS / VALVE PARAMETERS 5 2.2.3 DIAGNOSIS MENU 6 2.2.3.1 VALVE INFO 6 2.2.3.2 STATUS 6 2.2.3.3 SERIAL SETPOINT 7 2.2.3.4 TEST FUNCTION 7 2.2.3.5 TEST MODE SELECTION 7 2.2.4 SCOPE MENU 8 2.2.4.1 SCOPE SETUP 8 2.2.4.2 START ACQUISITION 9 2.2.4.3 STOP ACQUISITION 9 2.2.4.4 SHOW GRID 9 2.2.4.5 RESET ZOOM 9 2.2.4.6 GRAPHIC DISPLAY 9 2.2.4.7 READOUT 9 3. INFO BAR 10 4. PARAMETERS DESCRIPTION 10 4.1 CONTROL section 10 4.2 SETPOINT section 11 4.3 ANALOG OUT section 12 4.4 FEEDBACK section 12 4.5 AUTOSAFE section 12 4.6 DIGITAL INPUT section (option) 13 4.7 DISPLAY/KEYS section (option) 13 4.8 DIGITAL OUT section 13 4.9 ERROR section (option) 14 4.10 CASCADE CONTROL (option) 14 4.11 PASSWORD (option) 15 5. EXPERIMENTAL DEFINITION OF CONTROL PARAMETERS FOR A SPECIFIC APPLICATION 16 5.1 PRE-ADJUSTMENT 16 5.2 FORWARD OFFSET 16 5.3 FORWARD GAIN 16 5.4 PROPORTIONAL GAIN 16 5.5 DERIVATION TIME 16 5.6 INTEGRATION TIME 16 5.7 DEADBAND 16 5.8 INTEGRATION LIMIT 16 NOTE: Option features are only available in the EXPERT version of the DaS program and not in the LIGHT version. This is the help file for ASCO Numatics’ DaS program from version 5.00 upwards. This software only works with the SentronicD valve controller firmware version 14 or greater. MINIMUM SYSTEM REQUIREMENTS: Pentium II, 800 MHz, 32 Mbyte RAM, Windows 9x/Windows 2000/Windows NT 4.0/XP/Vista/7/8 1. INSTALLATION PROCEDURE From the Windows® Start menu, click Run... In the Open field type: - "instal-E" to install the English version. - "instal-G" to install the German version. - "instal-F" to install the French version. Follow the instructions on the screen. A "C:\Sentronic-Vxxx" and/or “C:\Sentronic-Xp-Vxxx” directory is created on your hard-drive C:\ and all needed files are copied to this directory. The program will be installed in the language you have selected. If a "C:\Sentronic-Vxxx" and/or “C:\Sentronic-Xp-Vxxx” directory already exists, an error message is returned. The installation procedure will, however, still work correctly. The directory will not be completely overwritten, your project files will be preserved. Only the program and language files are updated. 1.1 GETTING STARTED Double-click the DaS.exe file now located on your hard drive. Alternatively, drag and drop the "DaS-Xp" or "DaS-Lt" icon from the "C:\Sentronic-Vxxx" and/or “C:\Sentronic-Xp-Vxxx” directory to your desktop and double-click this icon. 1.2 HOW TO CONNECT THE SENTRONICD Unscrew the cover on the side of the valve and connect the RS232 adapter (part no: 881 00 732) into the valve's communication port. Connect the 9-pin Sub-D connector into the serial port of your PC (COM1 to COM8 can be used). Select the appropriate serial port from the Project/Serial Port menu. This selection is stored inside your PC. 1.3 GENERAL RECOMMENDATIONS Do not open the DaS program more than once. Only one application (.exe) can control the serial port! Use the installation procedure to have a full installation of the software. The hard drive will provide sufficent speed. If you use the Scope function, it may be helpful to close other time-consuming applications so the necessary resources are available. 1.4 HOW TO OPERATE THE SENTRONICD DISPLAY/PRESSURE READINGS: Shows the actual outlet pressure during normal operation. See "Parameters/Display" section. Other displays: Hnd Indicates that the Manual mode has been selected. SOF Internal error of pressure control. Replace valve or contact our Product Support. Err Internal overflow. AEr Auto zero overflow. Contact our Product Support. PUSHBUTTONS: To enter the Manual mode, press and hold both pushbuttons simultaneously during power up. "Hnd" appears in the display. The actual outlet pressure is displayed when the buttons are released. The yellow LED is enabled (ON). Use the UP button to increase the outlet pressure and the DOWN button to decrease it. The actual outlet pressure is displayed. Quick presses on the buttons allow you to make slight changes in the pressure rating. Longer presses allow you to make quick pressure changes. Press both pushbuttons simultaneously to exit the manual mode. The yellow LED is disabled (OFF). 2. HOW TO OPERATE THE DaS PROGRAM 2.1 HOT KEYS F1 Displays the Help window on the screen. F2 Displays the Status window on the screen. F3 Displays the Scope Function Settings dialogue box (data acquisition). F4 Starts data acquisition and updates the on-screen scope graph. F5 Stops data acquisition and freezes the scope graph for detailed analysis. F10 Resets the zoom factor to the default. Alt+F4 Exits the DaS program 2.2 MAIN MENU Project – Parameters – Diagnosis - Scope - ? 2.2.1 PROJECT MENU You can save your current valve parameters and the current scope graph in a project file. 2.2.1.1 NEW PROJECT… (unknown.das) Creates a new project. Please enter the file name without extension. The file name extension is forced to *.das. All other field entries (version, address etc.) are optional. Note: Use Save Project to save your own "Scope/Setup" in the file "unknown.das". After restarting the DaS program, select Open Project to open the "unknown.das" file and restore your scope settings. 2.2.1.2 OPEN PROJECT… (*.das) Opens an existing project from the directory in which you last saved it. You can switch to a different directory by using the standard Windows dialogue. 2.2.1.3 SAVE PROJECT (current project, current path) Saves the current project together with its parameters, status information, current graphs and scope settings in the current path. 2.2.1.4 SAVE PROJECT AS… (*.das) Saves the project with a new file name in the directory of your choice. Enter the file name without extension. The file name extension is forced to *.das. 2.2.1.5 PROJECT INFO Allows you to edit the project information such as Project name; Project version, Name; Address; City; Phone/Fax; Email 2.2.1.6 PRINT PROJECT… Prints the project to the default Windows printer. All: Prints project info, parameters and scope graphs. Parameters: Prints project info and factory or customer parameters as selected. Scope view: Prints project info, scope graphs and scope setup. 2.2.1.7 SERIAL PORT Allows you to select the serial port to which your valve is connected. The baudrate is automatically set at first start-up of communication with the valve. Baudrates of 19200 and 57600 are available. 2.2.1.8 EXIT Quits the DaS program. If you have not saved your changes you will be prompted whether or not to save before exiting. 2.2.2 PARAMETER MENU Control - Setpoint – Autosafe – Digital In – Display/Keys - Digital Out – ERROR – Cascade Control – Feedback – Analog Out - Password 2.2.2.1 PARAMETER SETTINGS FACTORY Reads the factory parameters from the valve. Factory parameters cannot be changed. These parameters are displayed in the grey parameter fields. If no parameters were read, the value "--" is displayed. CUSTOM Reads the custom parameters from the valve. These parameters are displayed in the grey parameter fields. If no parameters were read, the value "--" is displayed. Note: Only Custom Parameters can be projected and written into the file. Factory parameters are fixed values that cannot be changed. 2.2.2.2 PROJECTED PARAMETERS / VALVE PARAMETERS Clicking "Open Project…" will load the projected parameters from the project file and display them in the white parameter fields. If no project is opened, the default parameters are displayed. You can also modify the projected parameters in the white fields and save them offline. PARAMETER SETTINGS FACTORY Reads the Factory Parameters from the valve and displays them in the grey fields. CUSTOM Reads the Custom Parameters from the valve and displays them in the grey fields. READ Reads the Factory/Custom Parameters from the valve. WRITE Writes the Custom Parameters to the valve. When modifying parameters, keep to the order of read – copy – write. COPY Copies the Factory/Custom Parameters from the grey (valve) field into the white (project) field. Differences in the radio buttons between valve and project settings are highlighted in red. Reading and writing can take up to 10 seconds. If communication with the valve is interrupted or faulty, a "Communication Error" message appears. CLOSE Returns you to the Main Menu. For a detailed description of the parameters, see "PARAMETERS" section. Note: Modifying custom parameters: First "read" the Custom Parameters from the valve, then "copy" them into the project file (white fields) before you modify and "write" them. This prevents you from unintentionally changing parameters set for other groups. Restoring custom parameters: The initial Custom Parameters are identical to the Factory Parameters. If you wish to restore the initial Custom Parameters, copy the Factory Parameters into the project and write them as Custom Parameters to the valve. Proceed as follows: Click "Factory Parameter Settings" to read the factory parameters. Click "Copy" to copy them into the project. Click "Custom Parameter Settings" to switch to Custom Parameters. Click "Save Project" or "Save Project As…" to temporarily store the factory parameters in the project. Click "Open Project" to load the temporary project. Click "Parameters/Write" to write the initial parameters as Custom Parameters to the valve. It is good practice to always save your Custom Parameters in a project file (.das) before changing parameter settings. 2.2.3 DIAGNOSIS MENU Valve Info - Status - Serial Setpoint - Test Function 2.2.3.1 VALVE INFO READ VALVE INFO Reads the actual valve information from the valve. If communication with the valve is interrupted or faulty, a "Communication Error" message appears. OK Returns you to the Main Menu. PART NUMBER Shows the part number of the valve. Please indicate this part number when contacting our Product Support. CONTROLLER FIRMWARE Shows the version of the valve firmware. Please indicate this version number when contacting our Product Support. SERIAL NO. Shows the serial number of the valve. Please indicate this serial number when contacting our Product Support. PRODUCTION DATE Shows week and year of production of the valve. This is important for warranty claims. OPERATION COUNTER Shows the valve's total operating time under power. This value is not saved on loss of power or when the valve is powered off. CALIBRATION DATE Shows when the valve was last calibrated (production, service etc.). CALIBRATION STATUS On successful completion of calibration, a value of 240 is displayed. CALIBRATION COUNTER On completion of calibration sequence, a value of 1-255 is displayed. TEMPERATURE CALIBRATION Shows the ambient temperature during the calibration process. TEMPERATURE VALVE Shows the actual inside temperature of the valve electronics. In the event of an overtemperature alarm, this value is very high! 2.2.3.2 STATUS Displays the actual internal valve conditions. OVERVOLTAGE If the supply voltage is more than 30 volts, "YES" is displayed. Control is turned off and the valve is exhausted! Please check your power supply. UNDERVOLTAGE If the supply voltage is less than 18 volts, "YES" is displayed. Control is turned off! Please check your power supply and the wiring of the valve. JUMPER This is an optional hardware jumper currently not used. KEY LOCK Shows whether the keypad is locked (Enabled) or not (Disabled), see . OVERTEMPERATURE Shows that the valve electronics have detected overtemperature >100 °C ("Yes" is displayed). In this case, the operating mode is switched to Autosafe. Please check the inlet pressure which may have been below the outlet pressure for a longer period of time. This results in excess heating of the valve. To see the actual temperature, click Valve Info. MANUAL SETPOINT Shows whether the valve is in Manual mode (Enabled) or not (Disabled). To enter the Manual mode, turn off the power supply, press and hold both pushbuttons simultaneously and turn on the power supply again. "Hnd" appears in the display. Use the UP and DOWN buttons to increase and decrease the outlet pressure. Press both pushbuttons simultaneously to exit the manual mode. DIGITAL OUT Shows whether the digital output is in ON (HIGH) or OFF (LOW ) state. The state is influenced by the parameter settings in "Output Source" and "Output Mode". RESERVE Is reserved for future purposes. Currently not used. LEDs Display the actual state at the front of the valve. Green LED: ON indicates that the digital output is HIGH. OFF indicates that the digital output is LOW. FLASHES indicate an overtemperature alarm. Yellow LED: ON indicates that the valve is in Manual mode. OFF during normal operation. FLASHES in Autosafe mode, see "Autosafe". Red LED: ON indicates an undervoltage alarm. OFF during normal operation. FLASHES indicate an overvoltage alarm. If communication with the valve is interrupted or faulty, a "Communication Error" message appears. 2.2.3.3 SERIAL SETPOINT You can use this menu item to set an outlet pressure for start-up and maintenance. SERIAL SETPOINT Enter the desired outlet pressure in percent (%). PWM CONTROLLED Enter the desired PWM value in percent (%). TRANSMIT Click the "Transmit" button to send the value you have selected to the valve. If communication with the valve is interrupted or faulty, a "Communication Error" message appears. OFF Click the "Off" button to disable the function. The valve switches back to the analog setpoint. CLOSE Returns you to the Main Menu. For security, this is only possible if the Serial Setpoint is "Off". 2.2.3.4 TEST FUNCTION The test function is used for auto-testing during start-up and maintenance (continuous duty function). Once the test function is activated, it is executed until it is disabled (OFF) or until the valve is powered off. WRITE Writes the Test Function and the Ramp/Step Time to the valve. READ Reads the Test Function and the actual Ramp/Step Time from the valve and displays the values on the screen. If communication with the valve is interrupted or faulty, a "Communication Error" message appears. CANCEL Returns you to the Main Menu. CAUTION: The test function remains active! 2.2.3.5 TEST MODE SELECTION OFF Test Function disabled. RAMP Continuous up and down ramping from 0 to 100% and back in a triangular wave. STEP Continuous up and down stepping between 0 and 100% and back in a square wave. MULTISTEP Outlet pressure is continuously increased in 10% steps from 0 to 100% and then decreased in 10% steps back to 0%. RAMP/STEP TIME Defines the time for increasing the ramp/step from 0 to 100% and decreasing the ramp/step from 100 to 0%. Defines the time in multistep mode for each 10% step. 2.2.4 SCOPE MENU Setup – Start Acquisition – Stop Acquisition – Show Grid – Reset Zoom 2.2.4.1 SCOPE SETUP MODES: STEP MODE Performs one step from "Setpoint Begin" to "Setpoint End" and displays the result in a graph. Note: The outlet pressure is controlled by the DaS program. RAMP MODE Performs one linear pressure ramp from "Setpoint Begin" to "Setpoint End" in the "Ramp Time" and displays the result in a graph. Note: The outlet pressure is controlled by the DaS program. TRIGGER MODE Performs like a digital oscilloscope. For details, see "Trigger" section. Note: The outlet pressure is controlled by the analog setpoint. ACQUISITION TIME Sets the size of the time scale. TRIGGER: CHANNEL NONE (Roll mode) No trigger condition. Continuous display of selected analog channels and 4 binary channels. ANALOG CHANNELS Channel 1 to 4 BINARY CHANNELS Channel 1 to 4 SLOPE Trigger on "rising" or on "falling" slope of the selected trigger channel. VALUE Trigger value of the selected trigger channel (in percent). SAMPLE RATE Sets the number of data sets to be transmitted per second. Maximum: 4 msec = 250 data sets per second. Minimum: 200 msec = 5 data sets per second. For Step/Ramp mode, the Sample Rate is fixed at 4 msec. ANALOG CHANNEL Sets the transmitted and displayed channels. Analog Channel 1 Setpoint (Standard) Analog In 2 (Option) Analog Channel 2 Internal Sensor (Standard) Analog In 2 (Option) PWM Out Percentage of output current (coil) PWM Out 2 (Option) Reserved for future use (currently not used) Analog Channel 3 Control Deviation Difference between setpoint and feedback value (= pressure) PID Out Sum of proportional+derivative+integral value Control Out Sum of PID+forward control None No signal is displayed for this channel Analog Channel 4 P Value Proportional value I Value Integral value D Value Derivative value Forward Control Sum of forward offset + forward gain None No signal is displayed for this channel BINARY CHANNEL Sets the transmitted and displayed channels. Binary Channel 1 Digital Output see below Binary Channel 2/3 Digital Output Level of digital output (pressure switch window = default) The state is influenced by the Output Mode and the Output Source (see PARAMETERS) Shut Off HIGH = Output current (coil) is set to zero. The valve exhausts. LOW = Normal condition. Autosafe HIGH = Autosafe alarm is enabled. Coil current is switched on and off to prevent overheating; see Parameters/Autosafe. LOW = Normal condition Limit Threshold (Option) HIGH = Outlet pressure is above the limiting threshold + limit hysteresis. LOW = Outlet pressure is below the limiting threshold; see Parameters/Digital Output/Limit Size. Digital Input (Option) HIGH = Input level above 11 volts LOW = Input level below 5 volts Range HIGH = Setpoint is outside the 4...20 mA window; see Parameters/Error/Setpoint Range Detection LOW = Setpoint is inside the 4...20 mA window, or Out-Of-Range Detection is disabled. Error HIGH = Error message according to error parameter setting; see Parameters/Error. LOW = No error or Error Select is disabled. Inlet Pressure (Option) Not used. HIGH = Inlet pressure is below the Inlet Pressure Limit. LOW = Inlet pressure is above the Inlet Pressure Limit, or Inlet Pressure Limit is disabled. Binary Channel 4 Digital Input see above MASTER/SLAVE Selection is only possible if “Cascade Control” is activated in the “Controller structure”. 2.2.4.2 START ACQUISITION Starts data acquisition. If data acquisition is started in Step/Ramp mode, it is automatically stopped after the data acquisition time has expired. In Roll mode, data acquisition has to be stopped manually by pressing the "Stop Acquisition" button. In Trigger mode, data acquisition is started after the trigger condition is true and the graph is completed. Data acquisition is automatically stopped after the screen is filled (trigger is at 10% of the data acquisition time). 2.2.4.3 STOP ACQUISITION Stops data acquisition manually in Roll mode and Trigger mode. You can stop data acquisition at any time. The readings are plotted in a scope graph and displayed on the screen. 2.2.4.4 SHOW GRID Displays a time and amplitude grid on the screen. To remove the grid, click "Show Grid" once again. 2.2.4.5 RESET ZOOM Resets the zoom factor to the default set in Scope/Setup. Clicking the "Zoom Back" button does the same. 2.2.4.6 GRAPHIC DISPLAY Four analog channels and four binary channels are displayed along a time axis. The time scale is set from Scope/Setup/Acquisition Time. The time resolution (sampling points) for the Trigger Mode is set from Scope/Setup/Sample Rate. For the Step/Ramp Mode, the sample rate is fixed at 4msec. The graphic time resolution depends on the sample rate and the zoom factor. The amplitude resolution of the analog channels is limited to 256 increments; this corresponds to 0.4% for the left axis and 0.8% for the right axis. ZOOM IN Move the mouse pointer over the analog section of the time graph. The mouse pointer changes to a magnifying glass. Press and hold the left mouse button to slowly draw a "window". The "window" must be located in the analog section. Wait until the pointer cursor changes back into a magnifying glass. Then release the left mouse button to zoom in on the window you have drawn. Note: To zoom in on the time axis only, just draw a horizontal line. ZOOM OUT Click the "Zoom Back" button or press F10. 2.2.4.7 READOUT The cursor readouts are displayed on the left side of the screen. The results are continually updated in the Roll mode. As soon as the acquisition is complete, you can move the readout cursor to obtain a more detailed acquisition. Enter a new value in the Readout Time field and press the Return button. The value you entered is rounded off to a multiple of the sample time. You can also move the cursor readout graphically: Place the mouse pointer on the arrow symbol. The pointer changes into a double-arrow. Press and hold the left mouse button. Move the cursor in the horizontal direction. Wait until the pointer changes into a double arrow, then release the mouse button. Your cursor readout is now in a new position. Be sure to move the cursor slowly to allow the readouts to be updated. 3. INFO BAR The Info Bar is located at the bottom of the screen. PROJECT Displays the Project Name as defined in the Project Info window. FILE Displays File Name under which the project was saved. SETPOINT Displays the actual setpoint setting (normal or custom). This information will only display if a valve has been connected and a Read Parameter or Read Status command has been used. PARAMETER SET Displays whether Factory Parameters (unchangeable) or Custom Parameters (changeable) are used. VALVE TYPE Displays which type of valve is connected (e.g. SentronicD). CONTROLLER FIRMWARE Displays the controller's firmware version number. The colour of the Info Bar changes to red when the wrong firmware version is identified. 4. PARAMETERS DESCRIPTION 4.1 CONTROL section FORWARD OFFSET Fo (option) Applies a constant offset value to the control output (PWM). The coil needs a minimum current to increase the outlet pressure. Forward offset is used to compensate this physical effect [Y = ....+Fo]. FORWARD GAIN Fg Increases the control output (PWM) in proportion to the setpoint. The coil needs more current to increase the outlet pressure [Y = …+ (Fg * W)]. The maximum increase of the control output is "Fg * 100%". PROPORTIONAL GAIN Kp Control deviation Xd is "Xd = Setpoint W - Sensor value X". The control output changes in proportion to the control deviation: Y = ... + (Kp * Xd). DERIVATION TIME Td The sensor value (feedback) is derivated, then multiplied with Derivation Time and subtracted from the control output [Y = ...+ Kp(Td * dXd/dt). If you select Td=0 msec, derivation is disabled. INTEGRATION TIME Ti The control deviation Xd is integrated, then divided by Integration Time and added to the control output Y [Y = ... + (Time Integral Xd) / Ti]. INTEGRATION LIMIT IL (option) The integrator value is limited to avoid saturation. It is limited to ±IL (in %). IL=100% gives maximum limitation; integration is disabled with IL=0%. DEADBAND DB (option) To avoid low frequency oscillation, the integrator is halted inside the deadband. If control deviation Xd is smaller than ±DB%, the integration is halted. CONTROL STRUCTURE (option) Radio buttons are used to enable/disable parts of the control law and to get special control structures. Control law (calculation of manipulated variable): Control output Y = forward value + P value – D value + I value Y = Fo + (Fg * W) + (Kp * Xd) + Kp(Td * dXd/dt) + (Time Integral Xd) / Ti. PWM FREQUENCY (option) The proportional coil is controlled by a pulse-width-modulated (PWM) voltage. The PWM frequency can be modified within a range of 20 to 2000Hz. The PWM frequency is adapted to the valve's mechanics and should not be changed! CONTROL CYCLE TIME The control cycle time indicates the time intervals at which the control output (Y) is newly calculated. Changes within a range of 1 to 100 msec are possible. The cycle time is adapted to the control and the valve and should not be changed! I VALUE The I value determines what happens with the integrator (I value) when the control is in the “shut off” state. There are two possibilities to avoid integrator saturation: Hold: Integration value is maintained at the current value in the “shut off” state. Reset: Integration value is reset to zero in the “shut off” state. 4.2 SETPOINT section SETPOINT SIGNAL Select the signal for the setpoint: 0-10 volt; 0-20 mA; 4-20 mA SETPOINT DIRECTION Select whether the rising setpoint increases the outlet pressure (normal) or decreases the outlet pressure (inverse). SHUT OFF ON: If the setpoint is below the "shut off level", the coil current is switched off and the valve is fully exhausted. OFF: Disables the shut off function. This function is needed for "Setpoint Adjustment/Custom". Shut off level: Select a value between 0 and 10%. SETPOINT ADJUSTMENT Normal: 0 to 100% setpoint gives 0 to 100% outlet pressure. Custom: A setpoint between 0 and 100 % results in an outlet pressure between "offset" and "offset + span". Setpoint Offset: Select between -50% and +50%. Setpoint Span: Select between 50% and 100%. SETPOINT SELECTION (option) You can choose between the standard "Setpoint 1" and an optional "Analog In 2". RAMP FUNCTION No Ramp: Function disabled. Rising Ramp: "Ramp Rise Time" is used for increasing setpoints. Falling Ramp: "Ramp Fall Time" is used for decreasing setpoints. Rising+Falling Ramp: Combination of both ramp actions. The ramp time (in seconds) is always related to a 0 to 100% setpoint step. This means the rise of pressure (slope) is constant. SERIAL SETPOINT TimeOut/ms: Period of time in which a cyclic setpoint signal (PC control) must be transmitted. If no setpoint is sent during this period of time, the valve will automatically switch over to the analog setpoint. 4.3 ANALOG OUT section ANALOG OUT (option) An analog output can be used to transmit the feedback signal or other internal control signals. Note: Conversion from voltage output to current output must be made on the electronics (factory only). Signal: Select the type of signal (0..10V/0..20mA/4..20mA) Direction: Normal: 100% outlet pressure gives 100% current/voltage. Inverse: 100% outlet pressure gives minimum current/voltage. 4.4 FEEDBACK section FEEDBACK SELECTION (option) Feedback selection: Feedback control is made over the "Internal Sensor", an optional external "Analog In 2" or “Frequency In”. ANALOG IN 2 (option) Signal: Select the type of signal (0..10V/0..20mA/4..20mA) Direction: Normal: 100% external sensor value gives 100% outlet pressure. Inverse: 100% external sensor value gives 0% outlet pressure. AUTO ZERO Off: Function disables. On: The sensor is automatically reset to zero during "power up". The last compensation value is displayed in the "Auto Zero Value" field. AEr is displayed if the Auto Zero value exceeds ± 90. FREQUENCY INPUT (option) Flow l/min Sensor value Input pulse Imp/l Sensor value Gate time/ms Period of time during which the input pulses are counted A short gate time results in a faster reaction time, but with lower accuracy A long gate time results in a slower reaction time, but with higher accuracy Signal NPN Ground-switching sensor signal (Open Collector) PNP Plus-switching sensor signal Plaus Check Plausibility check OK Settings resulted in more than 100 pulses/s NOK Settings resulted in less than 101 pulses/s (the parameters could not be written) No reasonable control is possible at values below 101 impulses /sec. 4.5 AUTOSAFE section AUTOSAFE Off: Function disabled. On: Autosafe enabled. This function is activated by "Overtemperature", "Overcurrent" or "Outside Window". After the "delay time", the coil current is decreased in cycles to prevent overheating. OVERTEMPERATURE (option) Off: Function disabled. On: If the electronics temperature rises above the "Temperature Limit" setting, Autosafe is activated until the temperature falls below this limit. Temperature limit: Values between 50 and 150 degrees celsius are allowed. Note: Values below 70 degrees celsius can cause Autosafe during normal operation! Autosafe is activated right just after the "delay time" has expired. AUTOSAFE SOURCE (option) Outside Window: If the outlet pressure is outside the "Digital Out/Window Size" setting, Autosafe is activated until the outlet pressure is again within this window. Overcurrent: If the coil current rises above the "Current Limit Level", Autosafe is activated until the current falls below this limit. Current Limit Level: Select values between 100 mA and 2000 mA. AUTOSAFE TIMING (option) Delay time: Select between 5-10-15-20-25-30-35-40 seconds. Coil OFF Time: If Autosafe is enabled, the coil current is limited to max. 70% for the period set in "Coil OFF Time" to prevent overheating. Coil ON Time: If Autosafe is enabled, the coil current is regulated for the "Coil ON Time". OPTIONS (option) Disabled: Function inactive Autosafe: Special function Outlet Pressure Decrease: Function inactive Coil OFF: Function inactive 4.6 DIGITAL INPUT section (option) An optional "Digital Input" can be used to perform special outlet pressure functions. SELECT POLARITY (option) High Active: If digital IN is "high", the function is enabled. Low Active: If digital IN is "low", the function is enabled. SELECT FUNCTION (option) Disabled: Function inactive. Setpoint: Manual/Setpoint1 Switches between manual operation and setpoint. Analog In 2/Setpoint1 Switches between two analog setpoints. Feedback: Analog In 2/Internal Sensor Switches between internal and external sensor. Outlet pressure: Hold/Setpoint Maintain outlet pressure or bring pressure to setpoint. Zero/Setpoint Exhaust valve (0 bar) or bring pressure to setpoint. Max/Setpoint Pressurise valve (inlet pressure) or bring pressure to setpoint. 4.7 DISPLAY/KEYS section (option) DISPLAY SELECT (option) Allows different pressure units and signals to be shown on the "valve display". KEY LOCK (option) Off: Allows the use of the keypad on the valve. On: Locks the use of the keypad on the valve (no function). KEY FUNCTION (option) Disabled: Locks the keypad. Manual Setpoint: Press both buttons during power up to enter the manual mode (see "How to operate the SentronicD"). Menu: Reserved for future use (currently not used). Reserve: Reserved for future use (currently not used). LED ACTIVATION (option) Green LED: Controls the ON state of the green LED. Yellow LED: Controls the ON state of the yellow LED. Red LED: Controls the ON state of the red LED. 4.8 DIGITAL OUT section OUTPUT SOURCE (option) Inside Window: The digital output is enabled when the outlet pressure is inside the window set in "Window Size". Inside Window+Above Limit: The digital output is enabled when the outlet pressure is inside the window and above the "Limit Size". Note: Above signals are "active good" signals. ERROR: An error signal is activated as defined in the "Error" section ("active bad" signal). ERROR+Below Limit+Outside Window: Combination of all active bad signals. WINDOW DELAY Digital output filtering: A short-term switchover into the inactive state is suppressed for the delay time (bounce suppression). Select a value between 0 and 10 seconds. OUTPUT MODE Normal: The "Digital OUT" is high-active (active = 24 VDC) Inverse: The "Digital OUT" is low-active (active = 0 VDC) WINDOW SIZE The window is related to the setpoint and forms a symmetrical limit above and below the actual setpoint. Example: 5% window and actual setpoint = 80% (8 bar). To be inside the window, the outlet pressure must be between 75% (7.5 bar) and 85% (8.5 bar). Select a value between 3 and 20%. LIMIT THRESHOLD (option) Limit value: Checks whether the outlet pressure is above the limiting threshold (output mode = normal) or below the limiting threshold (output mode = inverse). Select values between 0 and 100%. Limit hysteresis: Defines the "Limit Hysteresis" of the limit size. Serves to debounce the limit size. Select values between 0 and 10 %. 4.9 ERROR section (option) ERROR SELECT (option) Defines the source of the error signal. Off: Function disabled. Range: See Error/Setpoint Range Detection. Inactive (manual): Manual operation, test function or "serial setpoint". Overtemperature: See Autosafe/Overtemperature. Low inlet pressure: See Autosafe/Inlet Pressure Sensor. Range + inactive: Combination of error signals. Range + inactive + overtemperature: Combination of error signals. Range + inactive + overtemperature + inlet pressure: Combination of error signals. SETPOINT RANGE DETECTION (option) If the setpoint range is set to 4..20mA (life zero), the input signal is checked to see whether it is inside this range. Off: Function disabled >20mA: Setpoint above 20 mA (control failure) <4mA: Setpoint below 4 mA (cable interruption) >20mA + <4mA: Checking for both conditions 4.10 CASCADE CONTROL (option) Additional parameters when using cascade control. SLAVE FORWARD OFFSET A constant value is applied to the control output (PWM). The coil needs a minimum current to change the outlet pressure. SLAVE FORWARD GAIN Increases the control output (PWM) in proportion to the slave's setpoint. The proportional coil needs more current to increase the outlet pressure. SLAVE PROPORTIONAL GAIN Control deviation Xd is "Xd (slave) = Setpoint (slave) - Sensor value (slave)". The control output changes in proportion to the control deviation. SLAVE DERIVATION TIME The sensor value (feedback) is derivated, then multiplied with Derivation Time and subtracted from the control output. If you select Td=0 msec, derivation is disabled. 4.11 PASSWORD (option) The password is entered here to enable write protection of parameters. 5. EXPERIMENTAL DEFINITION OF CONTROL PARAMETERS FOR A SPECIFIC APPLICATION (How to optimise your control parameters) 5.1 PRE-ADJUSTMENT Disable Integration by setting Integration Limit to 0 % (zero). Disable Derivation by setting Derivation Time to 0 (zero). Set Proportional Gain to 1.0. Set Deadband to 0.1 %. Disable Forward Gain: Set to 0 (zero). 5.2 FORWARD OFFSET Apply a setpoint of 5% (0.5V) to your valve. Adjust the Forward Offset so that the outlet pressure is between 3 and 5%. 5.3 FORWARD GAIN Apply a setpoint of 95% (9.5V) to your valve. Adjust the Forward Gain so that the outlet pressure is between 85 and 95%. 5.4 PROPORTIONAL GAIN Connect the valve to your application (tubing and volume). Enter the Scope/Step Mode and select a 0 to 50% step. Watch the step response displayed in the scope graph on the screen. Starting from 20, adjust down the Proportional Gain until there is no continuous oscillation anymore. 5.5 DERIVATION TIME Enter the Scope/Step Mode and select a 0 to 50% step. Watch the step response displayed in the scope graph on the screen. Starting from 0, adjust up the derivation time until the overshoot is acceptable and there is no continuous oscillation anymore. If the overshoot is still too high, then reduce the Proportional Gain. 5.6 INTEGRATION TIME Set the Integration Limit to 100%. Set the Integration Time to minimum (0.05 sec.). Enter the Scope/Step Mode and select a 0 to 50% step. Watch the step response displayed in the scope graph on the screen. Set the Acquisition Time to maximum (20 sec.). If sweeping occurs (low frequency oscillation), then increase the Integration Time step by step. If sweeping still occurs, you need to increase the Deadband. 5.7 DEADBAND To improve the precision of control, you can reduce the Deadband. 5.8 INTEGRATION LIMIT Apply a setpoint of 95% (9.5V) to your valve. Enter the Scope/Trigger/Roll Mode. Set the Acquisition Time to maximum (20 sec). Watch the I value at analog channel 4 for minimum and maximum values. Add a gap of 20% to the bigger value. Enter this result in the Integration Limit field. DaS Program HELP FILE DaS Program HELP FILE Page 6 of 16 Page 7 of 16