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FT Technologies FT702LT Manual

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FT702LT Wind Sensor Manual
Digital (RS485) - Flat Front Variant
TEL: +44 (0) 2089 430 801
FAX: +44 (0) 2089 433 283
WEB: www.fttechnologies.com
E-MAIL:
info@fttechnologies.com
A4206-4-EN
JULY 2017
The FT and Acu-Res logos are registered trademarks of FT Technologies Ltd
1
FT702LT Flat Front Wind Sensor Manual

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  • Page 1 Digital (RS485) - Flat Front Variant TEL: +44 (0) 2089 430 801 FAX: +44 (0) 2089 433 283 WEB: www.fttechnologies.com E-MAIL: info@fttechnologies.com A4206-4-EN JULY 2017 The FT and Acu-Res logos are registered trademarks of FT Technologies Ltd FT702LT Flat Front Wind Sensor Manual...

  • Page 2: Table Of Contents

    Heater Setup ........................11 INSTALLATION ....................12 Connectivity ........................12 Description of Parts ......................14 Lightning protection and EMC ..................16 Inspection of the FT702LT ....................21 Fault Finding & Troubleshooting ................... 22 Returns ..........................22 EVALUATION ....................23 Evaluation Pack ......................23 Acu-Vis Software ......................

  • Page 3: Product Symbols

    This composants du produit doivent être should be done by returning the product to recyclés. Cela doit être fait par le FT Technologies or by using an appropriate retour du produit à FT Technologies waste disposal company. This product utilisant...
  • Page 4 In accordance with the instructions set out in this manual, observing all information, warnings and instructions In accordance with any other instructions or guidance FT Technologies provide  To ensure that the product remains compliant with the electrical safety requirements of the UL / CSA...
  • Page 5 Conformément aux instructions figurant dans ce manuel et en observant toutes les informations, avertissements et instructions Conformément à d'autres instructions ou directives que FT Technologies fournit  Pour garantir que le produit reste compatible avec les exigences de sécurité électrique de l'UL/CSA 61010-1 normes, l'équipement doit être :...

  • Page 6: Introduction

    1 INTRODUCTION 1.1 Product Overview The FT702LT is a solid-state ultrasonic wind sensor which uses a patented Acoustic Resonance airflow sensing technique to measure accurately both wind speed and direction. The FT702LT has been specifically designed to operate in harsh environments such as offshore and lightning and ice- prone areas.

  • Page 7: Pipe Mount Sensor

    99.9% or better availability of wind speed and wind direction readings. No promise in part or full can be given to guarantee an FT702LT wind sensor’s continuous operation, as exceptional circumstances can occur that may result in the failure of the output from a sensor.

  • Page 8: Disclaimer

    The Purchaser assumes all risks and liability in conjunction with the use of the information given. Any warranty given by FT Technologies in respect of the Equipment is conditional upon the sensor being handled, installed, integrated and operated in accordance within the guidelines given in this manual.

  • Page 9: Functional Description

    2. The heater set point, current limit and maximum power limits can be configured by programming the sensor’s internal parameter settings (only available from Version 22 and above) 3. See safety instruction requirements (page 4) FT702LT Flat Front Wind Sensor Manual...

  • Page 10: Wind Speed Calibration

    Wind Speed Calibration All FT702LT wind sensors are built and then calibrated in the same wind tunnel before dispatch. There is no need to recalibrate a sensor over its lifetime as the sensor has no moving parts and so no measurement degradation will occur.

  • Page 11: Electronic Rotation Of The Datum Direction

    2.6 Heater Setup The FT702LT is fitted with an integral three element distributed heater that can be used to prevent icing-up of the sensor in freezing temperatures. The heater is controlled automatically by the FT702LT using a user programmable ‘set point’...

  • Page 12: Installation

    3.1.1 Connector Details All electrical connections are made to the FT702LT via a 5-way multipole connector located in the base of the wind sensor housing. The connector pin designations are shown in Figure 4 and the connector/mating connector manufacturer’s part numbers in Figure 5.
  • Page 13 FT702LT units to the computer. Before using an FT702LT in a multi-device system, the Listener identifier of each FT702LT must be set to a unique value. Use the ID command (Section 6.4.13) to set the Listener identifier for each FT702LT. If the Listener identifiers are being set in the final host system, then it is important that only one FT702LT be connected at a time to the RS485 bus until all devices have been assigned a unique Listener ID.

  • Page 14: Description Of Parts

    3.2 Description of Parts The FT702LT is designed to be mounted using an M6 socket head cap screw, nut and washer. The mounting flat on the support tube of the sensor (see Figure 7) allows for firm fitting against a flat surface. The preferred finish of the screw, nut, washer and the mounting bar is hot dipped galvanised steel.
  • Page 15 Figure 8: FT702LT-FF with protective sleeve 3.2.1 Alignment The FT702LT measures the wind direction relative to the mounting flat and bar. When the wind sensor is correctly aligned the wind direction measurements will be as shown in Figure 9. Figure 9: Correct Sensor Alignment...

  • Page 16: Lightning Protection And Emc

    50mm (see Figure 19). The length of any grounding wire or strap must be kept to a minimum. This will help to provide the lowest possible impedance path to the ground reference. FT702LT Flat Front Wind Sensor Manual...
  • Page 17 *The standards for Lightning Protection of Wind Turbines are described in IEC 61400-24. The installation instructions in this manual should be sufficient to ensure that the lightning protection zone around the sensor will achieve a lightning protection level of LPZ0B as described in the standard. FT702LT Flat Front Wind Sensor Manual...
  • Page 18 ④ The chassis of the cabinet must have a direct connection to ground Figure 13: Protection of equipment against indirect effects FT702LT Flat Front Wind Sensor Manual...
  • Page 19 The SPDs should also be grounded appropriately. Figure 14 shows how the SPDs should be installed. Figure 14: FT702LT digital interface surge protection The supply pair [24VDC / 0VDC] is electrically isolated from the other lines and the chassis. The triple RS-485 signal wires [Data ground, Data A, Data B] are isolated from the other lines and the chassis.
  • Page 20 Section 3 Installation Figure 16: Example of wiring inside a Phoenix Contact control cabinet FT702LT Flat Front Wind Sensor Manual...

  • Page 21: Inspection Of The Ft702Lt

    See section 2.5 for details on how to identify such faults. Connector protective sleeve: Check for any signs of damage or degradation. If the sleeve is damaged it should be replaced (see section 3.2). FT702LT Flat Front Wind Sensor Manual...

  • Page 22: Fault Finding & Troubleshooting

    Please contact FT Technologies for further information and advice if required. 3.6 Returns If a sensor appears to be faulty, please contact FT Technologies and request a Returns Materials Authorisation (RMA) form. Please complete the form and return as instructed. Returns cannot be accepted without prior approval via this authorisation form.

  • Page 23: Evaluation

    4.1 Evaluation Pack To help users carry out a test bench assessment of the FT702LT, FT Technologies sells an Evaluation Pack. This includes Acu-Vis software and the FT054 cable to connect the sensor to an external power supply and to a PC through a USB connector.

  • Page 24: Ft054 Evaluation Cable

    Figure 18: Acu-Vis Heater Controls 4.3 FT054 Evaluation Cable The FT702LT can be tested by connecting it to a computer. Figure 19 shows how the Evaluation Pack can be quickly set up to evaluate the sensor using Acu-Vis. Figure 19: Evaluation Cable 4.4 Quick Start Steps...
  • Page 25 Figure 21: Windows driver installation sequence 5. Once the above sequence is complete, wait approximately 10 seconds and then run Acu-Vis by selecting the shortcut icon on the desktop or from the start menu in the FT Technologies folder. Figure 22: Acu-Vis Shortcut Icon 6.

  • Page 26: Sensor Communication

    All user parameter settings are stored in non-volatile memory and are retained when the FT702LT is switched off. When the FT702LT is next switched on (or a user reset command is sent) the FT702LT will revert to these settings. The FT702LT can therefore be configured as required prior to final installation if required.
  • Page 27 To set the FT702LT baud rate use the BR command (Section 6.4.1) The FT702LT does not use handshaking (either hardware or software) to control the flow of data to and from the host computer. It is important, therefore, that the serial interface of the host computer is set with handshaking/flow control disabled.
  • Page 28 RS485 bus, you should assign each FT702LT in the system a unique Listener ID. The host computer will then be able to address individually each FT702LT. If you do not wish to use the Listener ID in messages sent from the host computer, you can replace the Listener ID with ‘//’.
  • Page 29 Without a checksum (FT702LT checksum validation automatically disabled): $02DFP*//<cr><lf> A checksum value is always transmitted by the FT702LT with every outgoing message. However the checksum field can be ignored by the host computer if checksum validation for received messages is not required.

  • Page 30: Parameter Settings

    6 PARAMETER SETTINGS 6.1 Command Types 6.1.1 Set Commands Figure 27 lists the commands that may be sent to the FT702LT from the host computer that are used to SET configuration options for the wind sensor. Command Mnemonic Configuration Options...
  • Page 31 Section 6 Parameter Settings 6.1.2 Query Commands Figure 28 lists the commands that may be sent to the FT702LT from the host computer that are used to QUERY the wind sensor’s latest readings or configuration. Command Mnemonic Sensor Data Returned...

  • Page 32: User Calibration Table

    Read the number of table entries and the table checksum;  Read out a selected row of table data,  Read out the User Calibration Table label. See sections 6.4.19 - 6.4.23 for further details. FT702LT Flat Front Wind Sensor Manual...

  • Page 33: Timing Constraints

    6.3 Timing Constraints When a valid command is received by the FT702LT input buffer, there will be a time delay whist the command is being processed. The actual command latency depends on exactly when the last character of the command is received within the FT702LT internal processing cycle.

  • Page 34: Command Parameters

    6.4 Command Parameters Each command, and its usage, is described in the following Sections. All examples, other than where stated, assume that the FT702LT Listener ID is set to 01, and the FT702LT TalkerID is set to WI, (Weather Instrument). 6.4.1...
  • Page 35 Always returns D <status> Always returns D Examples Example 1 The datum direction of the FT702LT is rotated by 5deg to the left with respect to the sensor’s mounting flat (as per Figure 9). Message Comment $01,CF355.0*//<cr><lf> Set offset angle to 5deg $01,CF?*//<cr><lf>...
  • Page 36 FT702LT will automatically resume outputting readings. Once the FT702LT has been put into continuous update mode then it becomes a talker only and will not respond to any further commands. To be able to send commands again the continuous mode must be disabled.
  • Page 37 Description Use the DF command to set the required format of the wind velocity readings. See command WV (Sections 6.4.25 & 6.4.26) for a description of the FT702LT output for each of the format types. When a DF Set command is sent to the sensor, a reset of the minimum and maximum readings to their default values is automatically performed.
  • Page 38 The Run-Time Counter is incremented on completion of each full hour that the anemometer has been in use. The DG run-time counter is only available from build version 22 and above. FT702LT Flat Front Wind Sensor Manual...
  • Page 39 FT702LT response Description Use the DL command to set the delay interval from when the FT702LT receives a command to when the command is executed. The DL command is primarily intended for use where a time delay may be required to allow the RS485 interface to switch from transmit to receive mode.
  • Page 40 Description The error report contains information on errors that have occurred during the operation of the FT702LT. The output string is always comprised of 15 ASCII characters (all shown as ‘0’, ASCII 30(HEX) in the above example). 9 10 11 12 13 14...
  • Page 41 Comment $01,FLD*//<cr><lf> Disable filtering $01,FL?*//<cr><lf> Query filter setting $WI,FL=D*41<cr><lf> FT702LT response Description Use the FL command to enable or disable moving average filtering of the wind speed and wind direction readings (see section 2.3). FT702LT Flat Front Wind Sensor Manual...
  • Page 42 The sensor’s internal memory is large enough to retain 64 previous speed and direction readings, allowing for maximum filter length of 12.8 seconds. The Filter Length setting is only available from build version 22 and above. FT702LT Flat Front Wind Sensor Manual...
  • Page 43 -99 to +99 the FT702LT, In ⁰C, in range 00 to ±99⁰C Examples Example 1 Set the FT702LT set point temperature to 5C. Verify that the command has been accepted. Message Comment $01,HT05*//<cr><lf> Set heater set point temp $01,HT?*//<cr><lf>...
  • Page 44 $WI,HT=010*22<cr><lf> FT702LT response Description Use the HT command to set the FT702LT heater parameters, including setting a delay time which specifies how many seconds will elapse after powering on the sensor before the heater is enabled. The Heater Delay setting is only available from build version 22 and above.
  • Page 45 (Factory default is 09 = 9 VDC.) Examples Example 4 Set the FT702LT heater current limit to 3.3A and set the under voltage limit to 10 VDC. Verify that the command has been accepted. Message Comment $01,HTL33,10*//<cr><lf>...
  • Page 46 The FT702LT 2 digit talker address identifier (Factory Default TxID = WI) Examples Example 1 Set the FT702LT listener address identifier to A1 and the talker address identifier to B1. Verify that the command has been accepted. Message Comment $01,IDA1B1*//<cr><lf>...
  • Page 47 Use the MM command to query the minimum and maximum wind speed readings that the FT702LT has recorded since it was last switched on. The minimum and maximum readings are set to their default values when an MMR, an RS or a DF set command is executed.
  • Page 48 The PR query function is only available from build version 20 and above. Currently the parameter report is only used for factory diagnostic purposes. FT702LT Flat Front Wind Sensor Manual...
  • Page 49 $01,RSU*//<cr><lf> Reset sensor, reloading last settings Description Use the RS command to reset the FT702LT software. The sensor will be ready to receive new commands or take readings from a maximum of 2 seconds after any reset command is sent.
  • Page 50 The overall number is the unique serial number identifier for the sensor. The build version is a 2 digit number which identifies the design version of the sensor. For example, this will be 22 for all version 22 sensors. FT702LT Flat Front Wind Sensor Manual...
  • Page 51 Software version of the sensor. The spaces are reserved for future use. Examples Example 1 Read the software version number Message Comment $01,SV?*//<cr><lf> Query software version $WI,SV= *06<cr><lf> FT702LT response Description The SV command returns the software version of the sensor. FT702LT Flat Front Wind Sensor Manual...
  • Page 52 The User Calibration Table is only available from build version 22 and above. When the User Calibration facility is enabled, the uncorrected wind speed indication of the FT702LT is calibrated according to the stored calibration records, using linear interpolation. FT702LT Flat Front Wind Sensor Manual...
  • Page 53 The user calibration table label is also cleared to 32 ASCII spaces when the UCCLEAR command is sent (see section 6.4.23). The User Calibration Table is only available from build version 22 and above. FT702LT Flat Front Wind Sensor Manual...
  • Page 54 Flash using the user calibration save command (see section 6.4.22). The User Calibration Table is only available from build version 22 and above. FT702LT Flat Front Wind Sensor Manual...
  • Page 55 The User Calibration Table is only available from build version 22 and above. Once the table has been saved into Flash memory, new data and the text string can only be written to it by first clearing the table. FT702LT Flat Front Wind Sensor Manual...
  • Page 56 6.4.20) This resets the label to 32 ASCII spaces. UC?T query command will only return a response after the user calibration table has been initialised. The User Calibration Table is only available from build version 22 and above. FT702LT Flat Front Wind Sensor Manual...
  • Page 57 The Factory Parameters retain the original default settings and cannot be modified, but can be used to replace the User Parameter, by using the RSF command (see section 6.4.16) Continued over the page… FT702LT Flat Front Wind Sensor Manual...
  • Page 58 User version becomes corrupt there is always a ‘clean’ back up Saved copy of the parameters that can be used to recover the sensor. FT702LT Flat Front Wind Sensor Manual...
  • Page 59 Any character other than ‘0’ (ASCII 30(HEX)) = error Examples Example 1 The following example illustrates the polar wind velocity data format. The example shows the FT702LT output with a wind speed of 20m/s and a wind angle of 45deg. Message Comment $01,WV?*//<cr><lf>...
  • Page 60 $WIMWV,045,R,020.0,M,A*3D<cr><lf> FT702LT NMEA response Example 2 The following example illustrates the NMEA wind velocity data format. The example shows the FT702LT output in knots with a wind speed of 30.6 knots and a wind angle of 9deg. Message Comment $01,WV?*//<cr><lf>...

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