ADTEK WSA User manual
WSA
Rev 1.0
2021-12-22
Duct Type Wind Speed Sensor
*575341-4d-454e-53-41*
Operation Manual
Contents
1. Installation .....................................................................................................................1
2. Dimensions....................................................................................................................1
3. Seting The Measuring Range For Wind Speed.............................................................2
4. Connection Instruction...................................................................................................2
5. Calculation.....................................................................................................................3
6. RS-485 Communication ................................................................................................4
7. Troubleshooting.............................................................................................................5
1
1. Installation
The sensor should be installed on sides or underneath the ducting instead of installing
top down. Firstly, drill a hole (hole diameter: Ø20mm) on the ducting, put the air pipe
in the hole, and adjust the arrow mark and wind direction in the same direction. Then
place 3 screws on the plate flanges, adjust the height of the sensor with the plate
anges, and lock the screws (see the picture below).
2. Dimensions
The arrow and the wind
direction should be in
the same direction.
2
3. Setting The Measuring Range For Wind Speed
The setting range of analogue output on the transmitter can be adjusted by the dip
switches on the sensors. You will see the di p switches after taking 4 screws out of
the case of the transmitter. Then you are able to adjust the setting range with the dip
switches (see the gure below).
Figure 1 Figure 2 Figure 3 Figure 4
(1) Figure 1: measuring range: 0~20 m/s
(2) Figure 2: measuring range: 0~30 m/s
(3) Figure 3: measuring range: 0~15 m/s
(4) Figure 4: measuring range: 0~10 m/s
4. Connection Instruction
4.1 Power connection: wide input voltage range:10~30Vdc
* The devices with 0~10V output can be used 24Vdc only.
4.2 Pin assignment
1 2 1 2 1 2 1 2
1: Power +24 Vdc
2: Power GND
3: RS-485 A+
4: RS-485 B-
3124
RS-485 signal output
1: Power +24 Vdc
2: Power GND
3: +Vout / +lout
312
Analog signal output
3
5. Calculation
5.1 Current to analogue output
For instance, if the setting range: 0~30.0m/s, output: 4~20mA, output signal: 12mA,
and it has to be caculated based on 16mA, it will be 30.0m/s/16mA=1.875m/s/mA,
which means 1mA stands for 1.875m/s (wind speed change), measuring value,
12mA-4mA=8mA, 8mA*1.875m/s/mA=15.0m/s.
5.2 Voltage to analogue output
For instance, if setting tange: 0~30.0m/s, output: 0-10V, output signal: 5V, and it
has to be caculated based on 10V, it will be 30.0m/s/10V=3.0m/s/V, which means
1V stands for 3.0m/s (wind speed change), measuring value,
5V-0V=5V, 5V*3.0m/s/V=15.0m/s.
4
6. RS-485 Communication
6.1 Parameters
Protocol: Modbus RTU mode
Address: 1~255
Baud rate: 2400, 4800(default), 9600
Parity: None
Data bits: 8 bits
Stop bit: 1 bit
Distance: 1500 M (max)
Terminate resistor: 120~300Ω/0.25W(typical: 150Ω
6.2 Address setting
The address can be set through the communication and dip switches. It is able to
choose only one way to proceed each time.
When 4 dip switches are switched to "OFF", it means the address can be set by
the communication only; while the dip switches are switched to "ON", it means the
address can be set by the dip switches only. The address setting range: 1~15, 1:
ON; 0: OFF.
Modbus Address 1 2 3 4
Use communication to
set the address 0000
1 0001
2 0010
...... ...... ...... ...... ......
15 1 1 1 1
6.3 Parameters table
Function Code:03h
Address Description Size Data format Range Unit Default R/W Notes
0x0000 Current wind
speed value 1 INT16U 0~300 0.1m/s R
0x0001 Current air volume
value 1 INT16U 0~65535 0.1
m3/h R
0x0002 Current air volume
value 2 FLOAT32 0~6553.5 m3/h R
Function Code:03h, 06h
Address Description Size Data format Range Unit Default R/W Notes
0x004E Drift register
coefcient A 2 FLOAT32 R/W
Drift register y=Ax+B,
coefcient A
(x=current wind speed)
0x0050 Wind speed
correction value 1 INT16 0.1m/s R/W Drift register y=Ax+B,
coefcient B
0x0200 Current duct cross
sectional area 1 INT16U 0~65535 cm2R/W
0x07D0 Address setting 1 INT16U 1~255 1 R/W
0x07D1 Baud rate setting 1 INT16U
0: 2400
1: 4800
2: 9600
1 R/W
5
7. Troubleshooting
7.1 Sensors can't connect with PLC/ PC
(1) Connect with incorrect COM port
(2) Incorrect address or duplicate address
(3) Incorrect setting: baud rate, correction, data bits, stop bits
(4) Time interval and reponse time should be set at least 200ms.
(5) RS-485 cable breaks, or reverse wiring( A line, B line)
(6) It must go with RS-485 extender and terminate resistor（120Ω) if connecting with
too many devices, or placing overlong wiring
(7) USB to RS-485 driver uninstalls, ro damages
(8) Devices damage
7.2 Incorrect analgoue output
(1) Wrong corresponding to setting range will cause the error caculation of PLC.
(2) Incorrect wiring, or incorrect order of connection
(3) Incorrect power supply
(4) The distance between the transmitter and the collector is way too long.
(5) Damaged devices
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