Analog Wind Transmitter WAT12 USER'S GUIDE M210309EN-A June 2002
PUBLISHED BY Vaisala Oyj P.O. Box 26 FIN-00421 Helsinki Finland Phone (int.):+358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2002 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice.
___________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION .......................................................5 About This Manual..................................................5 Contents of This Manual.......................................5 Version Information...............................................6 Related Manuals...................................................6 Safety .............................................................
User's Guide ________________________________________________________ CHAPTER 4 MAINTENANCE...................................................................... 31 Periodic Maintenance .......................................... 31 Visual Checking ................................................. 31 Testing Proper Operation................................... 31 Replacing Consumables...................................... 33 Parts List for Consumables ................................
___________________________________________________________________ Figure 16 Basic Wiring with WAA151 and WAV151 Sensors...................................................................23 Figure 17 Wiring with WHP151 Mains Power Supply .............24 Figure 18 Wiring with WHP25 Mains Power Supply and the 252 Series Wind Sensors ..........................25 Figure 19 Mounting the Thermostat Switch inside the WAT12 Junction Box ........................................
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Chapter 1 ___________________________________________ General Information CHAPTER 1 GENERAL INFORMATION About This Manual This manual provides information for installing and maintaining WAT12 Analog Wind Transmitter. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides important safety, revision history, and warranty information for the product. - Chapter 2, Product Overview, introduces WAT12 Analog Wind Transmitter features.
User's Guide ________________________________________________________ Version Information Table 1 Manual Revisions Manual Code T649en-1.1 M210309EN-A Description WAT12 Analog Wind Transmitter Technical Reference. This manual, the first version of WAT12 Analog Wind Transmitter User's Guide. Supersedes the above mentioned Technical Reference.
Chapter 1 ___________________________________________ General Information NOTE Note highlights important information on using the product. Product Related Safety Precautions WAT12 Analog Wind Transmitter delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product, and verify the grounding of the outdoor installation periodically to minimize shock hazard. CAUTION Do not modify the unit.
User's Guide ________________________________________________________ before touching the boards. Ground yourself with a wrist strap and a resistive connection cord. When neither of the above is possible, touch a conductive part of the equipment chassis with your other hand before touching the boards. - Always hold the boards by the edges and avoid touching the component contacts. Regulatory Compliances WAT12 Analog Wind Transmitter is a CE compliant product.
Chapter 2 ____________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces WAT12 Analog Wind Transmitter features. Introduction to WAT12 Analog Wind Transmitter The WAT12 transmitter converts the digital data supplied by the Vaisala 151 and 252 Series wind sensors, into two industry standard analog current loops; one representing the wind speed and the other the wind direction.
User's Guide ________________________________________________________ The WAT12 transmitter provides the sensors with a throughput for optional heating power. A thermostat switch is available as an option to automatically connect the heating power in temperatures below +4 °C.
Chapter 3 __________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install this product. Selecting Location Allow sufficient clearance for the wind sensors. Wind sensors should not be located next to a building or any other object that might affect the flow of air.
User's Guide ________________________________________________________ In general, any object of height (h) will not remarkably disturb wind measurement at a minimum distance of 10 × h. There should be at least 150 m open area in all directions from the mast. Refer to Figure 2 on page 11. 0204-041 Figure 3 Recommended Mast Length on Top of a Building The recommended minimum length (marked with the letter h in Figure 3 above) for the mast that is installed on top of a building is 1.
Chapter 3 __________________________________________________ Installation Installation Procedure For installation, follow the procedure below and refer to corresponding sections for details. 1. Remove the four screws holding the cover of the WAT12 transmitter. Remove the cover. 2. Select the current output span, as well as direction and speed scaling according to the instructions in section Jumper Settings on page 14.
User's Guide ________________________________________________________ Jumper Settings The loop current can be selected with the on-board jumper plugs. Several output ranges, such as 0 to 20 mA, 4 to 20 mA, 0 to 10 mA, 2 to 10 mA, 0 to 5 mA, and 1 to 5 mA, are available as user configurable options, each with factory-adjusted zero and span levels. The voltage-mode signals are easily obtained by connecting a suitable resistor across the readout device's terminals.
Chapter 3 __________________________________________________ Installation For example, you can set the wind speed output from 1 to 5 mA which corresponds to speed values from 0 to 51.2 m/s and to direction values from 0 to 540 degrees. This range does not change the scaling of 360 degrees corresponding to one full turn, rather it allows to calculate the average direction during northerly winds. These settings are carried out by the jumpers of the WAT12 transmitter as described in Table 3 below.
User's Guide ________________________________________________________ 0206-044 Figure 6 Jumpers for the Setting: 1 ... 5 mA, 0° ... 360°, 0 ... 76.8 m/s 0206-045 Figure 7 Jumpers for the Setting: 0 ... 10 mA, 0° ... 540°, 0 ... 51.2 m/s Connections The WAT12 transmitter provides the line cable entry through a gland for a cable with a diameter from 7 to 10 mm. For better protection against RF interference, bend the cable shield as illustrated in Figure 8 on page 17.
Chapter 3 __________________________________________________ Installation 0206-046 Figure 8 Cable Shield Bent over the Plastic Sleeve and O-ring The WAT12 transmitter has three I/O connectors as listed in Table 4 on page 18. For the location of the connectors, refer to Figure 9 below. 0206-047 Figure 9 I/O Connectors The following numbers refer to Figure 9 above.
User's Guide ________________________________________________________ Table 4 Connector X1 X2 X3 I/O Connectors Description Plug-in connector with screw terminals (5 pcs) for the anemometer cable. Maximum wire cross section area is 1.5 mm2. Plug-in connector with screw terminals (8 pcs) for the power and signal cable. Maximum wire cross section area is 1.5 mm2. Plug-in connector with screw terminals (11 pcs) for the wind vane cable. Maximum wire cross section area is 1.5 mm2.
Chapter 3 __________________________________________________ Installation The following numbers refer to Figure 10 on page 18. 1 2 3 = Anemometer cable = Glands for power and signal cables = Wind vane cable Signal Output The signal output provides two analog current loops, direction and speed, with sourcing drivers with an o/p driving voltage 10.5 V typically and an o/p resistance of 57 Ω. The loops return to the common ground for power and signal.
User's Guide ________________________________________________________ Figure 12 below illustrates wiring for high noise environment. It is essential to ground the cable also at the power supply. 0206-050 Figure 12 Wiring for High Noise Environment Figure 13 below illustrates wiring for long distance with the 5 mA loop current. Note the maximum resistance values for both the power and signal leads.
Chapter 3 __________________________________________________ Installation 0206-052 Figure 14 Long Distance Wiring with Four Wires Powering The WAT12 transmitter accepts a wide range of input power, from 12 to 28 VDC. When the 5 mA loop current is selected, the total current consumption is less than 40 mA including the sensors and the loop current.
User's Guide ________________________________________________________ The power line is protected against the wrong polarity. Transient protection is accomplished with VDRs, series inductors and resistors, and transient zener diodes on both the power line and each I/O line. Optional Heating Power The WAT12 transmitter also provides the sensors with a throughput for optional heating power. The heating power connection requires an extra pair of wires.
Chapter 3 __________________________________________________ Installation Wiring Examples Refer to Figure 16 below for the basic wiring, when the WAA151 and WAV151 wind sensors are connected to the WAT12 transmitter. 0206-054 Figure 16 Basic Wiring with WAA151 and WAV151 Sensors Figure 17 on page 24 illustrates the wiring with WHP151 Mains Power Supply. Figure 18 on page 25 illustrates the wiring with WHP25 Mains Power Supply and the 252 series wind sensors.
User's Guide ________________________________________________________ 0206-055 Figure 17 Wiring with WHP151 Mains Power Supply 24 _____________________________________________________M210309EN-A
Chapter 3 __________________________________________________ Installation 0206-056 Figure 18 Wiring with WHP25 Mains Power Supply and the 252 Series Wind Sensors VAISALA__________________________________________________________25
User's Guide ________________________________________________________ Mounting the Thermostat Switch The thermostat switch connects at +4 °C (+3 °C) and disconnects at +11 °C (+3 °C). For mounting, refer to Figure 19 below. For standard wiring, refer to Figure 20 on page 27. 0206-057 Figure 19 Mounting the Thermostat Switch inside the WAT12 Junction Box The following numbers refer to Figure 19 above.
Chapter 3 __________________________________________________ Installation 0206-058 Figure 20 Standard Connection for Thermostat Switch Mounting Mounting WAT12 to the Top of a Pole Mast Figure 21 below illustrates mounting of the WAT12 transmitter to the top of a Ø 60 mm pole mast, with the standard mounting clamp. The arrow on the cover of the junction box must point to north.
User's Guide ________________________________________________________ WARNING A long cable between different units (sensors, transmitters, power supplies, and displays) can cause a lethal surge voltage, if a lightning strikes in the vicinity. Always ground the mast equipment case close to the mast with a short and low-resistance cable.
Chapter 3 __________________________________________________ Installation Alignment After mounting the WAT12 transmitter to the mast, check that the WAV151 end of the cross arm is pointing to north with the required accuracy, see Figure 21 on page 27. For ensuring correct assemblage after aligning the WAT12, you can mount the sensors on it only in one way.
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Chapter 4 ________________________________________________ Maintenance CHAPTER 4 MAINTENANCE This chapter provides information that is needed in basic maintenance of WAT12 Analog Wind Transmitter. Periodic Maintenance Visual Checking Check every 1 to 2 years that the printed circuit board is not corrored. Testing Proper Operation For easy testing and adjustment, reference signals are provided for the two output channels.
User's Guide ________________________________________________________ Table 6 Jumper Selectable Reference Sources for Testing Variable Direction Speed Reference Signal Alternatives 000° / 008° / 357° 0.0 m/s / 0.8 m/s / 51.2 m/s Follow the procedure below to test the WAT12 transmitter functionality with the reference signals: 1. Remove the four screws holding the cover of the WAT12 transmitter. Remove the cover. 2. Remove the jumper J5 from the jumper block X4 to enable the test stage. 3.
Chapter 4 ________________________________________________ Maintenance Replacing Consumables When replacing the component board, read carefully section ESD Protection on page 7. When replacing the thermostat switch, refer to section Mounting the Thermostat Switch on page 26.
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Chapter 5 ______________________________________________ Troubleshooting CHAPTER 5 TROUBLESHOOTING This chapter describes common problems, their probable causes and remedies, and provides contact information. Common Problems Table 9 Some Common Problems and their Remedies Problem Data is not received by the data collecting system. Shaft heating of the sensors is not working. Probable Cause Improper or loose connections Improper or loose connections Heating is not connected.
User's Guide ________________________________________________________ Getting Help For technical questions or for comments on the manuals, contact the Vaisala technical support: E-mail helpdesk@vaisala.
Chapter 5 ______________________________________________ Troubleshooting Return Instructions If the product needs repair, please follow the instructions below to speed up the process and avoid extra costs. 1. Read the warranty information. 2. Write a Problem Report with the name and contact information of a technically competent person who can provide further information on the problem. 3.
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Chapter 6 _______________________________________________Technical Data CHAPTER 6 TECHNICAL DATA This chapter provides technical data of WAT12 Analog Wind Transmitter. Specifications Table 10 WAT12 Analog Wind Transmitter Specifications Property Equipment type Description / Value Digital-to-analog current loop converter for Vaisala wind sensors Signal input: wind direction 6-bit parallel GRAY code (optionally 7 bits) wind speed Pulse frequency 0 ... 750 Hz Input operating power 12 ...
User's Guide ________________________________________________________ Property Signal cable Max. loop resistance (incl. cable and receiver's input resistance) Full scale options: for direction for speed Resolution: for direction for speed Updating interval: for direction for speed Output accuracy Accuracy with loop resistance: RL= 100 Ω RL= 20 ...
