Tech-Trol GasFlow™ 7255
Contents
1. connecting pin3 and ground Figure 16 LED light goes solid 7 Turn the power back on to the actuator and wait until the LED light on the top of the actuator goes solid Gasket Figure 18 Position reset Figure 17 Gasket 8 The actuator will then go through a mechanical position reset 9 When the reset is complete closed to open and back to closed then turn the power back off 10 Put the gasket back in place and re connect small black center connector and turn power back on to test the actuator 15 11 Screw the connectors back in Note If the LED light is blinking it means that the actuator is not working Figure 19 Connectors back in place 16 Touch Screen Calibration Sometimes if something is selected on the touch screen it may not get selected This type of problem arises for all devices with touch screen This means that the touch screen is out of calibration Now the touch screen needs to be calibrated Below listed are the steps that are needed to calibrate the touch screen 1 Open the controller door and make a quick reset of the screen power by switching off and turning back on the switch shown in the picture with the index finger on the screen On off button AS maw ay Me i Figure 20 On off button Figure 21 Holding the screen when it is switched off 2 Hold the screen while it is off Switch the screen on The caliubration screen appears Do not hold the scree2. be calibrated every 30 days Figure 2 Press to zero Once the Zero Suction button is chosen from the Home Page the above screen appears The Press To Zero button has to be selected in order to complete the operation No changes will be made until then If you do not want to continue select the Home Page button to go back to the Home Page The sensor input will not have changed Display Sensor Data button This button will display the real time sensor values It can be viewed even when the compressor is not running The Home Page button can be pressed to go to the Home Page The sensor data display screen is automatically displayed after start sequence is followed and completed Figure 3 Display Screen Data Set System Parameters button This button lets the operator specify how the compressor will operate by how the system parameters are set The Set System Parameters screen is shown in Fig 4 Set System Parameters The buttons are used to scroll up and down between the different parameters The lt gt button is used to navigate left right within the same parameter and the buttons enable user to raise or lower the selected parameter s value The 2nd 3rd and 4th columns represent the upper range lower range and their units respectively The different parameters like suction delay suction range etc are explained on page 13 Note Pressing this button during normal running conditions will kill the motor
3. compressor starts the unit is considered to be in Run mode The Display Data screen figure 3 will show current values of all the sensors While the compressor runs the controller will monitor all sensor values Shutdown Mode If the controller shuts down for any reason other than high or low suction user must resolve the fault is listed on the screen before restarting the compressor If the controller has the Auto Start feature enabled it will restart automatically once the suction corrects itself EMERGENCY KILL Figure 8 Shutdown General controller shutdown criteria examples High Low suction e High Low discharge e Excessive vibration e RPM e High Low compressor oil pressure e High Low engine oil pressure e Low engine oil level e High Engine Temperature e High compressor temperature Note If auto start feature is disabled the controller will not restart automatically Set system parameters screen SUCTION DELAY Allows the user to select how quickly the controller will react to Suction Pressure in order to delay a shutdown It works kind of like a de bounce for rapidly changing Suction Pressures The Suction Delay can be set for up to 120 seconds or down to zero The system continually polls all sensor inputs while the compressor is running If Suction Pressure is beyond one of the set limits longer than the delay period the Compressor will shut down with a Suction fault
4. this manual are for reference only The features on the controller are subject to customer specifications At a Glance Home Screen The main screen or the Home screen is where the user will always Start to get to any of the settable parameters on the controller The Home screen displays the serial number compressor company s name web site address and the RUN HOURS Apart from this the home screen also contains five buttons at the bottom namely Press To Start Set Points Set System Parameters Display Sensor Data and Zero Suction Serial No Run Hours Set Points button Press To Start button Set System Parameters button Display Sensor Data button ua Zero Suction button xx Figure 1 Home Screen 4 Zero Suction button This button will allow the user to zero the current value of the suction sensor The user should check the following a Suction sensor is properly connected to the controller b There is no Pressure on the sensor Note Sensor must be at atmospheric pressure before Zero Suction button is pressed Note 1 The suction sensor must be connected during the zero mode Do not zero the suction sensor while it is disconnected from the controller This will result in false suction sensor readings Note 2 For application where the suction is read in inches water column or ounces the suction sensors must
5. Figure 4 Set System Parameters Set Points button The set points are also called the kill points They represent the upper and lower limits of each parameter for which the system needs to be stopped They can be set for all analog sensors The buttons are used to scroll up and down between the different parameters The button is used to navigate left right within the same parameter andthe buttons enable the user to raise or lower the selected sensor s value The 2nd 3rd and 4th columns represent the upper range lower range and their units respectively Note Pressing this button during normal running conditions will kill the motor Figure 5 Set Points Press To Start button Once the Press To Start button is pressed there will be a 10 second countdown indicating that the system is about to start This is accompanied by a flashing amber light shown in figure 6a Once the system starts the display screen figure 3 on page 6 will be displayed lf the Emergency Stop button Figure 6b is pressed the screen will show the display as in Figure 7 Note Pull out the emergency start button and then press start button to start Flash light Emergency stop button Rann Figure 6a Flash Light Figure 6b Emergency stop button RESET EMERGENCY STOP BUTTON THEN PRESS THE START BUTTON TO START Figure 7 Press to start The Run and Shutdown mode Run Shutdown Mode Run Mode Once the
6. TECH TROL GASFLOW 7255 PROGRAMMABLE CONTROLLER VRU Model Electric Drive Unit User Manual Please read this manual before operating the controller and keep it for future reference Distributed by Giechtro nc Pawnee OK 74058 www techtrol usa com 918 762 1050 Table of contents Introduction 3 Home Screen 4 Buttons Zero suction 5 Display sensor data 6 Set system parameters 7 Setpoints 8 Press to start 9 Run Shutdown mode Run mode 10 Shutdown mode 10 Set system parameters screen Suction delay 11 Suctionrelay 11 Run hours 12 Lockouttimer 12 Motorrange 12 Ball valve openclose 12 Throttling motorized valve 13 Touch screen calibration 17 Introduction The TechTrol GasFlowTM programmable controller will continuously monitor and control critical conditions on gas compressors The 7255 model is specific to the electric drive units Features of the controller include a high resolution graphics Touch screen menu driven user selectable commands and a variety of control features selectable by the user to help maintain suction on the Vapory Recovery Unit The various options and how each one works are discussed in this User s Manual Note The features described in
7. and be displayed on the Shut Down Screen For all other Sensor Inputs that are outside of the Set Points the Compressor will shut down immediately The value in the left column H SP is the only value that needs to set for Suction Delay The right column L SP has no effect SUCTION RELAY This feature allows the user to set the desired pressure range that will activate the bypass ball valve and Motor Speed The left column H SP is the high pressure side in which the bypass valve will close and go to the sale gas mode when the Suction Pressure exceeds this value If Suction drops below this value the bypass valve will open and go into bypass mode in an effort to re circulate gas within the compressor The right column L SP is the low pressure side If a throttling ball valve is connected to the bypass line it will attempt to adjust to the upper setting It gives more control over the bypass mode Set system parameters screen Continued RUN HOURS Unit Run Hours For maintenance purposes the run hours can be reset with every oil and or filter change If a cumulative run time is kept and the unit receives a program upgrade you can reset the run hours to the value on the unit at the time of the upgrade LOCK OUT TIMER The user can set this variable for the start up lockout timer On startup the sensors will not be monitored for a fault condition until this timer counts down to zero Cau
8. n for too long now When the calibration screen comes up tap the screen immediately so that it takes to the calibration screen shown If it doesn t repeat the above process until you get to the calibration screen Figure 22 Screen turns back on Figure 23 Tap when prompted to 17 3 Tap the screen again in order to calibrate the screen Figure 24 Blinking dot at top left Figure 25 Tap the blinking dot 4 A blinking dot appears on the top left of the screen as shown Touch that and now the blinking dot appears in the bottom right of the screen which has to be touched Now the touch screen calibration is done Figure 26 Blinking dot at bottom right Figure 27 Tap the blinking dot 18 wil a ing were be tee ia Ww od wee mM hey II ad de he me 19 20
9. ning of the ball valve Do not try to manually adjust the ball valve position when in the Auto mode From time to time it may be necessary to calibrate the ball valve If the ball valve does not go to the fully closed position or to the fully open position as expected To complete a calibration of the ball valve proceed as follows This procedure will externally mechanically reset the open and closed position for electric actuators with the DPS module installed when the units gets moved off zero 13 Figure 10 Motorized Ball Valve 1 Remove the power supply to the actuator Remove connector or turn power off the power connector is the large gray one on the far left side Remember to check if the LED light on the top of the actuator is off Figure 11 Removing connector Figure 12 LED light off 2 Remove the small black center connector from the actuator Note The connector pins are oriented in only one way and can be connected only to the respective slots Figure 13 Small connector removed 3 Place the ball valve in Manual Mode 4 Adjust the ball valve to the closed position perpendicular with the handle on top Figure 14 Normally closed position 14 5 Turn the ball valve to Auto Mode Now remove the gasket for the pin 6 On the small black plug on the actuator center connector short pin 3 to Earth Ground pin a Pin3 Ground A th ya a Figure 15
10. tion Do not set this parameter such that you run the machine long enough to cause damage It is the operator s responsibility to monitor sensor data and use the Emergency Shut Down switch if necessary during the lock out mode MOTOR RANGE The user can set the maximum and minimum RPM of the motor If VAR FREQUENCY is enabled the motor will run proportional to the suction as listed above If VAR FREQUENCY is not enabled 0 the motor will run at the high set value only BALL VALVE OPEN CLOSE The bypass throttling ball valve can be programmed to operate at a relative soeed from 1 to 20 The open and close function can be set independently A setting of 1 will move the ball valve the slowest and a setting of 20 will cause the maximum speed at which the ball valve will operate The user should experiment with these settings to optimize the control For example a slower moving ball valve may allow excess pressure into the bypass Throttling Motorized Ball Valve The throttling ball valve is used for bypass and for other applications when required The ball valve is controlled by the panel while set in Auto mode The black knob located on the front of the ball valve allows the user to select between Auto and Manual Manual mode allows operator to use the handle on top to manually open or close the ball valve Note the handle direction represents the position of the ope
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