BEIN Torque Trak 20K Manual de usuario
869610-9
Torque Trak 20K
Torque Telemetry System
User’s Guide
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Contents
1 System Overview...........................................................3
1.1 TX20K Transmitter...................................................4
1.2 RX20K Receiver ......................................................4
2 Features and Controls ...................................................5
2.1 RX20K Receiver ......................................................6
2.1.1 Connections ......................................................6
2.1.2 LED Indicators...................................................7
2.2 TX20 Transmitter.....................................................9
2.2.1 External Connections ........................................9
2.2.2 LED Indicator...................................................10
2.2.3 Measurement Ranges.....................................10
2.2.4 Internal Shunt Resistors..................................11
2.2.5 Operating Modes.............................................11
2.2.6 Signal Accuracy...............................................13
2.2.7 Signal to Noise Ratio.......................................14
2.2.8 RF Power Level...............................................14
2.2.9 Power Supply Voltage Measurement ..............14
2.2.10 Power Consumption.....................................15
2.2.11 Battery Life...................................................15
3 Product Safety.............................................................16
4 Installation....................................................................16
4.1 Field Testing..........................................................17
4.2 Bench Testing........................................................19
5 Communications Protocol............................................19
5.1 General USB Host to RX20K Communications .....19
5.2 RX20K to USB Host Block Messages....................20
5.3 USB Host to RX20K Commands ...........................28
Appendix A: System Specifications....................................36
Appendix B: Calibration Calculations.................................37
Torque on Round Shafts .................................................38
Appendix C: Strain Gage Installation .................................44
Warranty and Service Information.......................................49
FCC Rules Part 15: Computing Devices.............................50
This document is subject to change without prior notification.
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This document is subject to change without prior notification.
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1 System Overview
The TorqueTrak 20K Torque Telemetry System utilizes proven digital RF
technology to transmit a single data signal (most typically from a strain
gage) a distance of 10 feet (3 meters) or more depending on the
environment. Up to 16 systems can operate simultaneously on
independent channels.
TX20K Transmitter:
The TorqueTrak 20K is a robust, precision strain measurement
instrument ideal for short-term data collection and diagnostic testing. It is
designed to withstand harsh field conditions with ease-of-use in mind. A
standard TorqueTrak 20K Torque Telemetry System includes the
following items:
TX20K Transmitter
RX20K Receiver
Receiver Antenna Element
Receiver Antenna Magnetic Base with 13-ft Cable
6-ft USB 2.0 A-male to B-male Shielded Cable
10-ft 4-Conductor Ribbon Cable
BS900 Bridge Simulator
Narrow Blade Screwdriver
9V Battery Connectors (2)
9V Lithium Battery
1 Roll of 1” Fiberglass Reinforced Strapping Tape
Butyl Rubber Sheet
Teflon Film kit
Printable TT20K User's documentation
TT20K Equipment Case
Calibration Certificate
TT20K Configuration and Monitor PC software
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1.1 TX20K Transmitter
High signal-to-noise ratio for excellent resolution
Low temperature coefficient for accuracy from -40 to 85°C
Wide power supply input range from 6 to 20VDC
Power Standby mode to extend battery life
Two on-board shunt calibration values
Status Indicator light to assist in troubleshooting
Circuit fully encapsulated
Two different transmit modes; Block, and Stream.
Remotely configurable sample rate, signal bandwidth, baud rate,
RF channel, transmit power, and input signal range.
Two on-board shunt calibration values.
Status Indicator light to assist in troubleshooting.
Circuit fully encapsulated.
1.2 RX20K Receiver
Compact 30 x 63 x 125 mm (1.2" x 2.5" x 5") size.
USB powered (PC or USB charger)
Digital USB serial data and analog voltage output signals
Stable 1.2KHz analog output frequency response
Configurable RF channel settings
Seven unique simulated transmitter inputs
Configure from PC over USB connection
Standalone operation without PC using analog output
Four external status LEDs.
Analog output configurable for 0-5V, 0-10V, ±3V, ±5V, ±10V.
Configurable analog output offset, scale, and polarity.
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Configurable input for optional speed sensor.
Simple Configuration and Monitor PC software included as well
as serial protocol information for digital interface to data
acquisition systems.
2 Features and Controls
The TT20K is a dynamic torque measurement system designed for
temporary installations. The TX20K Transmitter is mounted on the
rotating shaft along with a strain gage(s) and battery. The RX20K
Receiver is connected to the USB port of a PC. The TX20K and RX20K
communicate with one another using RF transceivers built into each.
The strain gage (torque) signal and status information is transmitted off
the shaft by the TX20K and received by the RX20K and then sent on to
the PC. Operational configuration information is sent from the PC,
though the RX20K to the TX20K on the shaft.
The TT20K system is compact yet powerful. Configuration and
monitoring is intuitive using the included PC software. Incorporation into
data acquisition systems can be accomplished using the serial digital
data available through the USB connection or the standard analog
output.
The RF transceivers in the TX20K and RX20K are user selected to
operate any of 16 different frequencies below. This allows up to 16
TT20K systems to simultaneously operate in fairly close proximity.
These RF frequencies are different than those of the TT10K system. So
TT20K and TT10K systems can also operate in close proximity without
interference.
Table 1, TT20K RF Channels
CH
Freq (MHz)
CH
Freq (MHz)
CH
Freq (MHz)
CH
Freq (MHz)
1
903.37
5
909.37
9
915.37
13
921.37
2
904.87
6
910.87
10
916.87
14
922.87
3
906.37
7
912.37
11
918.37
15
924.37
4
907.87
8
913.87
12
919.87
16
925.87
The TX20K RF transmission power level is user adjustable. There are
four different levels that can be chosen depending on the specific
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application. A higher RF power level will allow for more reliable
transmissions over longer distances or in noisy RF environments. The
lower RF power levels will increase battery life longevity.
The RX20K always operates at maximum allowable RF power level
since it is not battery operated.
2.1 RX20K Receiver
The Receiver module had no display or control buttons. Configuration is
done through the USB connection with a PC using the included
Configuration and Monitor software. See the Configuration and Monitor
software User's Guide for information regarding program operation and
use. Once the Receiver module has been configured, it is possible to
use it as a standalone system with power through the USB connector
and the optional analog output expansion board.
2.1.1 Connections
One end of the receiver features a SMA reverse polarity antenna
connector and a 5.08mm pitch 3 position plug receptacle for the optional
speed sensor input. With the standard analog output expansion board, a
3.81mm pitch 2 position plug receptacle provides the analog output
signal.
The opposite end has a high insertion force USB type B receptacle for
power and serial communication. Near the USB connector are four
green indicator LEDs.
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2.1.2 LED Indicators
Starting with the upper left LED and moving clockwise, the indicators are
RNG, RXD Data, USB Data, and RPM.
During power-up initialization or after a system reset, the normal LED
pattern has both USB Data and RPM LEDs OFF while RNG and RXD
Data LEDs alternate being ON. The power-up initialization lasts for
about 5 seconds followed by all LEDs being on solid for about 1 second
then all turn OFF before beginning normal operation.
If a bootloader checksum error is detected during initialization, the RXD
Data LED turns ON alone and remains ON (not recoverable).
If a program checksum error is detected during initialization, the RPM
LED turns ON alone and remains ON (not recoverable).
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2.1.2.1 Range (RNG) LED
The Range LED is ON solid green when torque values are being
received from the TX20K and are within range. If no torque values are
being received, the Range LED is OFF. If torque error value(s) are
received, the Range LED flashes at a rate of 2Hz. If errors are received
intermittently, the Range LED is retriggered OFF for a least one
250msec period.
Table 2, Signal Sample Error Values
Torque
sample
value
Description
Indication
±20000
Valid signal sample
value range
Samples between these values
(inclusive) are valid signal
measurements
+20001
TX20K input differential
mode over-range
The input signal is out-of-range.
Increase Range setting, check
gage and wiring
-20001
TX20K input differential
mode under-range
+20002
TX20K input common
mode over-range
+Vsen of the bridge is not near
midscale of Vexc. Check gage
and wiring
-20002
TX20K input common
mode under-range
+20005
TX20K internal analog
zero is over-range
Internal circuit fault
-20005
TX20K internal analog
zero is under-range
+20010
TX20K Vpwr is over-
range
Circuit damage could occur.
Check Vpwr (battery) voltage.
-20010
TX20K Vpwr is under-
range
Circuit may not function properly.
Check Vpwr (battery) voltage.
Note: Larger error values have higher priority when two or more errors
occur at the same time.
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