Dwyer VPT User Manual
™
Series VPT Positioner Transmitter
20 4030
LCD
LCD
VPT-L
VPT-R
2
-29/32
[
74.00]
2-11/64
[55.00]
4
5/64
[
17.80]
2
-1/16
[
52.50]
3
-49/64
[
95.50]
3-7/8
[98.60]
1-3/8
[35.00]
6
1/64
[
24.30]
2
-11/64
[
55.00]
26° [MAX. 34°]
1
3°
2
-29/32
[
74.00]
BASE COVER
PCB BOARD
POSITION
BLIND PLUG
BASE BODY
FEEDBACK SPRING
FEEDBACK LEVER
CABLE CONNECTOR
MAIN GEAR
TRANSMETTER ASS'Y
MAIN SHAFT
C
OVER BOLT
Specifications - Installation and Operating Instructions
Bulletin V-VPT
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.
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 lb (0.6 kg).
Phone: 219/879-8000 www.dwyer-inst.com
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Installation
LEVER PIN
CONNECTOR LEVER
FORK
ACTUATOR
90°
4mA
8mA
12mA
16mA
20mA
LOAD
OUTPUT
4~20mA DC
10~30V DC
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.
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.
OTICE
N
nd 100%, check to see if the feedback lever is touching the lever stopper (located
a
n the backside of VPT-LA1). If touching, the VPT-LA1 should be installed further
o
away from the center of the actuator yoke.
fter installing the VPT-LA1, operate the valve stroke from 0 to
A
00% by using the air filter regulator on the actuator. At both 0
1
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, the 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.
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. 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.
Power Connection
CAUTION
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 in²
(1.25 mm²), 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.
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