Layout 2 - Dwyer Instruments, Inc.
Contents
1. The slot length on the VPT LA1 feedback lever is 26 6 5 mm so the diameter of the connection bar should be less than 24 6 3 mm 5 Connect the air filter regulator with the actuator temporarily Set the supply pressure of the air filter so that the actuator clamp is at 50 of valve stroke 6 Insert the connection bar attached to the actuator clamp into the slot of the VPT LA1 s feedback lever In order to reduce hysteresis it should appear as shown in step 5 7 Check that the VPT LA1 s feedback lever is level at 50 of valve stroke If not move bracket or feedback link until it is level After installing the VPT LA1 operate the valve stroke from 0 to 100 by using the air filter regulator on the actuator At both 0 and 100 check to see if the feedback lever is touching the lever stopper located on the backside of VPT LA1 If touching the VPT LA1 should be installed further away from the center of the actuator yoke 8 Once the VPT RA1 is installed according to the above procedures tighten the bolts and nuts of the bracket and feedback lever connection bar completely Installing VPT RA1 with Bracket The VPT RA1 is designed for rotary motion valves such as Dwyer Instruments ball and butterfly valves using rack and pinion scotch yoke or complex type actuators whose stem is rotated 90 1 Before installing the VPT RA1 please set the actuator to the default position For single action type valves t2. reaches its default position press the 4 mA button for approximately 3 to 4 seconds The indicator light will light up indicating that the 4 mA position has been calibrated 3 Please repeat the above steps for 8 12 16 and 20 mA settings for the 5 point setting For the 2 point setting repeat the above steps only for 20 mA Setting Lamp 5 O gt Setting point S W i 2 POINT e O ED Xe O 2 O Wz oz al ald oz Calibration S W Troubleshooting 1 VPT has no output signal A Check the input signal to the VPT B Check power connection and polarity of terminals 2 Input and output signals for the positioner differ greatly A Check the input signal value and voltage Insufficient voltage can affect the input signal value B Check the installation of the positioner If the positioner is not properly installed reinstall properly using the positioner s manual C Reset positioner s zero and span values Inaccurate zero and span settings can lower accuracy and linearity D Check the installation of the VPT If it is installed improperly refer back to installation section of manual 3 Sudden change in VPT s output signal value A Make sure the VPT s l
3. 9057 www dwyer inst com e mail info dwyer inst com Installation NOTICE Before installation be sure to be aware of the following Always wear safety equipment and follow safety procedures As a safety precaution during installation it is advised to shut down valve and actuator temporarily In order to prevent total shut down of system please utilize by pass valve or other similar device and dissemble the valve on which the position transmitter will be installed In explosive area please make sure no explosive gases are present at time of installation Installing VPT LA1 with Bracket 1 It is necessary to make a proper bracket to attach on the actuator yoke Please refer to actuator and VPT dimensions to make proper bracket size The most important considerations in the design of the bracket are as follows VPT LA1 feedback lever should be at 50 of valve stroke Feedback level connection bar of actuator clamp should be connected in the position so that the valve stroke and the numbers carved on feedback lever are fitted If the bracket meets the above conditions the VPT LA1 can be installed very easily 2 Assemble VPT LA1 and bracket with bolts Use standard bolts in bolt holes on the backside of the unit 3 After assembling VPT LA1 and bracket with bolts attach it using bolt holes of actuator yoke Do not tighten completely There must be some space 4 Connect VPT LA1 feedback lever to the actuator clamp
4. PT IMITY Bulletin V VPT Series VPT Positioner Transmitter Specifications Installation and Operating Instructions The Series VPT Valve Position Transmitter is an ideal way to track position of valve With both linear and rotary motion monitoring available this Valve Position Transmitter can suit a wide variety of applications Using a resistance gear in conjunction with a potentiometer the change in resistance outputs a proportional current signal which is sent to the controller The standard LCD display allows operator to monitor the precise position of valve Series VPT Parts and Assembly Below is the assembly for the VPT LA1 and VPT RA1 with the only difference being the feedback lever COVER BOLT BASE COVER PCB BOARD MAIN GEAR POSITION q gt MAIN SHAFT TRANSMETTER ASSY BLIND PLUG i CABLE CONNECTOR BASE BODY FEEDBACK LEVER FEEDBACK SPRING DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46360 U S A nm rumu LCD VPT L VPT R 55 00 SPECIFICATIONS Input Signal 0 to 30 LA1 0 to 90 RA1 Output Signal 4 to 20 mA DC Supply Voltage 9 to 28 VDC Enclosure Aluminum Electrical Connection M20 cable gland Linearity 1 FS Hysteresis 0 2 FS Sensitivity 0 2 FS Enclosure Rating IP67 Operating Temperature 22 to 185 F 30 to 85 C Weight 1 3 Ib 0 6 kg Phone 219 879 8000 Fax 219 872
5. e potentiometer please note the following before re setting the potentiometer Power must be turned off before adjusting the potentiometer Be sure there is no remaining current on the PCB Excessive force is unnecessary when disconnecting the potentiometer from the PCB Excessive force may cause damage to the transmitter 1 Locate the potentiometer under the PCB and disconnect Do not use excessive force 2 Unfasten the lock screw which locks the potentiometer gear and remove potentiometer body from the lag gear 3 Fix the feedback lever at 50 and measure the resistance 4 Rotate the pinion gear until resistance value reaches approximately 5K ohms 5 After setting the resistance value rotate the stopper to the normal position and fasten the lock screw 6 Reconnect the potentiometer to the PCB and reinstall the PCM onto the Position Transmitter s body Adjustment of Setting Points The Series VPT Position Transmitter can be calibrated by either of the following options 1 2 Point Setting By setting the minimum and maximum points 0 and 100 the values between the outputs are calculated and calibrated automatically 2 5 Point Setting By setting 5 points 0 25 50 75 and 100 the outputs can be set accordingly In general a 5 point setting is much more accurate Adjustment of Calibration 1 Input a 4 mA signal to the positioner in order to move the valve stroke to its default position 2 After the valve stroke
6. ever is placed at 50 If not the VPT needs to be re installed and adjusted to place lever at 50 B Adjust the potentiometer The potentiometer s resistance should be at approximately 10K ohms at the 50 point MAINTENANCE REPAIR Upon final installation of the Series VPT no routine maintenance is required The Series VPT is not field serviceable and should be returned if repair is needed Field repair should not be attempted and may void warranty WARRANTY RETURN Refer to Terms and Conditions of Sales in our catalog and on our website Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair Be sure to include a brief description of the problem plus any additional application notes Copyright 2011 Dwyer Instruments Inc Printed in U S A 12 11 FR RB 443955 00 DWYER INSTRUMENTS INC Phone 219 879 8000 www dwyer inst com P O BOX 373 MICHIGAN CITY INDIANA 46360 U S A Fax 219 872 9057 e mail info dwyer inst com
7. he actuator will automatically default itself when the air pressure shuts down For double action type valves the default position must be set manually according to the actuator s specifications 2 Please refer to the actuator and VPT RA1 s dimensions in order to make the proper bracket See below diagram for installation with bracket 3 After the appropriate bracket is made install the VPT RA1 on the actuator and fasten all bolts and nuts completely ACTUATOR Power Connection 1 Before connecting terminal power must be shut off 2 Use ring type terminal against oscillation impact etc 3 In order to protect Position Transmitter the ground terminals should be grounded 4 Use twisted cable with conductor sectional area at least 0 0019 in 1 25 mm7 and suitable for 600V as on conductor table of NEC Article 310 Outer diameter of cable should be 25 to 39 6 35 to 10 mm Use shielded wire against electromagnetic waves and noise 5 Do not install the cable near equipment such as a high capacity transformer or motor LOAD OUTPUT x 4 20mA DC 10 30V DC Adjustment of Potentiometer The potentiometer is deigned to output a 12 mA signal when the feedback lever is at 50 In case of dislocation of th
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