LSI LASTEM DNA121 Combined Cups and Vane User Manual

LSI LASTEM DNA121 Combined Cups and Vane User Manual

Description

Main features

This sensor includes, in a single apparatus, the transducers for measuring wind speed and direction. Its use simplifies the installation and the plant design in respect of the systems with separate units plus giving some other advantages being smaller, lighter and cheaper.

The measurement system is made up of a sensor, the rotors DNA124 and DNA127 and the cable of DWA type. For more information about the models of the sensors see §1.2 instead for the accessories and the spare parts see §6. The connector MG2251 is used when the user desire to realize its own cable.

Models

Output WS

Output WD

| Hz

0÷1 V

| 4÷20 mA

4÷20 mA

| 0÷5 V

0÷5 V

| RS485

RS485

Direct output wind

speed/direction sensor

| DNA121| | |
Direct output and low energy consumption wind

speed/direction sensor

| | | |
Microprocessor based wind speed-direction sensor with

normalized output.

| | DNA821 DNA821.1

DNA821.2

| ****

DNA827

|
Speed-direction sensor with

RS485 output.

| | | | DNA921

Tab. 1 – Combined sensor models.

Technical specifications

Specifications: VDI 3786 Part 2 and ASTM D 5096-96.

Mechanical and electrical specifications

(Calibrated by CETIAT (France))

__

PN

| __

DNA121

| DNA821 DNA821.1 DNA821.2| __

DNA827

| __

DNA921

---|---|---|---|---
Wind speed output| 0÷833 Hz| 4÷20 mA| 0÷5 Vdc| RS485
Wind speed range| 0÷75 m/s (damage limit)| DNA821: 0÷60 m/s

DNA821.1: 0÷50 m/s

DNA821.2: 0÷75 m/s

| 0÷60 m/s| 0÷60 m/s
Wind direction output| 0÷1 Vdc| 4÷20 mA| 0÷5 Vdc| RS485
Protocol| –| –| –| Modbus RTU®, TTY-ASCII
Configuration| –| –| –| Hyperterminal
EMC| EN61326-1 2013| EN61326-1 2013| EN61326-1 2013| EN61326-1 2013
RS485 protection| –| –| –| Galvanic insulation (3 kV, UL1577)
RS485 speed| –| –| –| 1.2÷115 kbps
Poer supply| 10÷30 Vac/dc| 10÷30 Vac/dc| 10÷30 Vac/dc| 10÷30 Vac/dc
Power consumption| 0.5 W| 0.5 W| 0.5 W| 0.5 W
Data logger compatibility| M-Log (ELO008),

E-Log,

A-Log using ALIEM modem

| M-Log (ELO008),

E-Log,

A-Log using ALIEM modem

| –| E-Log using RS485->232

converter, Alpha-Log.

25 m/s: 2%

Threshold| 0.26 m/s
Delay distance| 4.8 m @ 10 m/s, according to VDI3786 and ASTM 5096-96
Resolution| 0.06 m/s
Direzione del vento| Principle| Hall effect
Range| 0÷360°
Accuracy| 1%
Threshold| 0.15 m/s
Delay distance| 1.2 m @ 10 m/s, according to VDI3786 and ASTM 5366-96
Resolution| 0.3°
Damping coeff.| 0.21 @ 10 m/s, according to VDI3786 and ASTM 5096-96
Informazioni Generali| Damage limit| 75 m/s
Connector| 7 pin IP65 watertight connector
Housing| Anodized aluminium
Cups| PA6 plastic and fiberglass
Vane| Aluminium
Protection| IP66
Mounting| Mast Ø 48÷50 mm
Operative temperature| >-30 °C (without ice)

Assembly instructions

Select a well-exposed spot for the instrument. The WMO (World Meteorological Organisation) suggests that the instrument is assembled 10 m off the ground; in a place where the distance of the gauge from surrounding obstacles which might disturb the measurements, it is at least 10 times the height of those objects from the ground.

As such a position is difficult to find, the WMO suggests that the instrument is assembled in a spot which is reasonably uninfluenced by local obstructions; where the measurements taken will be as equal as possible to those taken from an ideal spot.

Mounting

Unscrew the nut and washer from the shaft thread

Mount the DNA124 rotor on the combi sensor’s body.

Tighten the screw of the rotor (indicated by the arrow).

Insert the DNA127 wind vane on the sensor’s body. Keep the shank in a steady position and insert the vane until it goes to the nut adjustment.

Insert the washer and nut on the threaded shaft; then tighten with a wrench while holding the shaft with the screwdriver. ATTENTION! Do not tighten the nut by holding the windvane with your hand to prevent that the sensor loses its setting.

Tighten the protective cover.

Connect the cable to the sensor.

Mount the sensor on the mast and tighten the screw.

When fixing the sensor in its position on the pole, point the “red nose” to NORTH for orientation.

Read IST_00764 “Instructions for the use of DNA121-DNA122 sensors with LSI LASTEM data logger” to connect these sensors to LSI LASTEM data loggers.

Connections

Connections must be performed following the drawings:

DNA821           DISACC 5830e
DNA827           DISACC 07021
DNA921           DISACC 6095
DNA121           DISACC 5828c

Transfer function table for DNA121

Operation check

For the verification you need the drawing (DISACC) of the sensor and a multimeter or a PC, depending on whether the output is analog (current, voltage, resistance) or digital (RS485). For mechanical verification of the sensor see chapter 5.

Check operation of wind speed measurement

Verification of the analog output of the measurement takes place by means of a multimeter. Identify the sensor output according to its code (§Tab. 1) and proceed as follows:

For sensors with frequency output signal:

1. Set the multimeter to measure frequency signals (Hz).
2. Connect the multimeter leads to the two sensor wires (it is not necessary to disconnect it from the data logger.)
3. With the rotor stopped, the multimeter should measure 0 Hz.
4. With the rotor moving, read a value greater than 0 Hz on the multimeter. For sensors with current output signal:
5. Set the multimeter to measure direct current (DC) signals and 20 mA scale.
6. 2. Disconnect the wire corresponding to the negative signal (- Sig) and connect it to the test lead + (red) of the multimeter. The lead – (black) fix it instead of the disconnected wire.
7. With the rotor stopped, the multimeter should measure approximately 4 mA.
8. With the rotor moving, the multimeter should measure a value greater than 4 mA.

For sensors with voltage output signal:

1. Set the multimeter to measure DC signals and scale 0 ÷ 20 V.
2. Connect the multimeter leads to the two sensor wires (it is not necessary to disconnect it from the data logger.)
3. With the rotor stopped, the multimeter should measure approximately 0 V.
4. With the rotor moving, the multimeter should measure a value greater than 0 V.

Verification of the digital output (RS485) can be done using a PC, equipped with an RS232 serial port and in which the third-party program modpoll (https://www.modbusdriver.com/modpoll.html) is installed.

1. Connect the sensor serial cable to the PC serial port.
2. Open a DOS Prompt window and type the following command (it is assumed that the transmission parameters are set as follows: Baudrate: 9600 bps, Parity: Even and that the PC serial port used is COM1): modpoll -a 1 -r 1 -c 2 -t 4:float -p even -b 9600 com1 [Enter] For the list of available commands, type the command modpoll /help.
3. With the rotor stopped you should read 0 as the first value displayed by the program.
4. With the rotor moving, a value greater than 0 should be read as the first value displayed by the program.

Check operation of wind direction measurement

Verification of the analog output of the measurement takes place by means of a multimeter. Identify the sensor output according to its code (§Tab. 1) and proceed as follows: For sensors with resistance output signal:

1. Set the multimeter to measure resistance with a 2000 Ω scale.

2. Disconnect the terminal with the direction wires and connect a multimeter lead to wire B
   (6 – cursor) and the other lead to wire C (7 – common).

3. Rotate the vane as shown in the table and check the respective values.

For sensors with current output signal:

1. Set the multimeter for direct current (DC) measuremets with a 20 mA scale.
2. Disconnect the wire corresponding to the negative signal (- Sig) and connect it to the test  lead + (red) of the multimeter. The lead – (black) fix it instead of the disconnected wire.
3. Rotate the vane as shown in the table and check the respective values.

For sensors with voltage output signal (0÷1 and 0÷5 V):

1. Set the multimeter for direct voltage (DC) measurements with a 20 V scale.

2. Connect the multimeter leads to the two sensor wires (it is not necessary to disconnect it
   from the data logger.)

3. Rotate the vane as shown in the table and check the respective values.

Verification of the digital output (RS485) can be performed as for speed measurement. The modpoll
command parameters to be executed are the same. The values to be checked are those relating to the
second measurement displayed by the program.
Rotate the vane as shown in the table and check the respective values.

Maintenance

Routine checks should be carried out on the combi sensor at least once a year, to ensure that:

• the rotor and flag are not in any way deformed;
• the conical pin on which the rotor rotates moves freely;
• the sensor is clean and in good condition; attention to the space between the transducer and the rotor.

It is recommended to check the sensor calibration every two years.

Accessories / Spare parts

Conformity declarations

FUNZIONE DI TRASFERIMENTO IN FORMA TABELLARE TRANSFER FUNCTION TABLE Velocite’ Speed m/s Frequenze Frequency Hz 0 0 1.001 12.31 3.011 11.12 5.02 70.51 10.026 113.17 20.08 295.01 29.99 135.28 37.71 556.82 50 731.72 60 882.19

LSI LSI LASSO. US ’41 Ont. • f :XCIOSILuoia l000rnoa•so IMO: Italia 9f CI 41 Wall• .110 ‘Wee* t on LI CC. Iva \ AT 7N.070101SO ci DICHLILRAZIONE DI CONFORMITA’ CE CE Conformity Declaration Prdurtore: LSI LATEEN! s.r.L Via Ex 52.161 Doan, a.9 – 20090 Settala Premeougo (MD—Italia Con la presence si dichiara the i season di Velociti e Direzione del 1.1110 DNAl21 e DNAl22 per Imo natara non contengoao component; elettriciiekttronici tali da xnerare o coatthaire a generare emissioni clettromagnetiche e pertanto non sono s000etti ala Direttin Eatopea: We hereby clecue ;ha: the Speed and DO.ection wind DA:4121 mad D.\:41:: :armors fir its are don’t contain e!ecokedxnonic component to produce or to contribute to produce e:truomcrgnerk true and thereVore they aren’t subiter to the European Dewing: EMC Directive 2004/105/CE La presence dichiaratime copre midi modal de/tread dai prodotti sops citati The preen:declaration COW: all tlx options denied 17) the rpectrao d product Settala. febbnio 2012 Dr. Giulio Cerro Dtre•ore Generale eLepie Raiiprnentinte

References

• Free Modbus Master Simulator and Test Tool

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