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Table of Contents
Related Manuals for AI-Tek Instruments TACHTROL 3
Summary of Contents for AI-Tek Instruments TACHTROL 3
- Page 1 TACHTROL ®...
- Page 2 AI-TEK INSTRUMENTS, LLC 152 Knotter Drive Phone: 1-800-643-0643 P.O. Box 748 7/04 13010-D 7/04 Cheshire, CT USA 06410-0748 Printed in U.S.A. www.aitekinstruments.com Printed in U.S.A.
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Page 3: Table Of Contents
TABLE OF CONTENTS FOREWORD ............. . 1 INTRODUCTION . - Page 4 HOW TO INSTALL THE TACHTROL 3 TACHOMETER ® ........18 MOUNTING THE INSTRUMENT .
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Page 5: Foreword
FOREWORD The following manual is written for users of the TACHTROL ® 3 tachometer manufactured by AI-Tek Instruments. The manual provides easy to follow, step by step instructions for setting up and installing the instrument. Some knowledge of algebra is helpful but not necessary. INTRODUCTION The TACHTROL ®... -
Page 6: Theory Of Operation
3.0 THEORY OF OPERATION Speed sensors (transducers such as AI-Tek series 70085, H or BH) are placed near ferrous metal tar- gets such as gears. The sensors generate repeating electrical pulses (input signal frequencies) whose repetition rates are proportional to the rates of the event. The TACHTROL ®... - Page 7 Once you have selected a function for and determined the behavior of each output, you set up the instrument by entering twelve 4 1/2 digit, signed numbers (called constants) on the thumbwheel and pushbutton switches on the control panel located behind the Door. These constants are held in the TACHTROL ®...
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Page 8: How To Operate The Tachtrol
determines which functions are sent to the four outputs. 1121 (Function The calculated values of A and B (such as difference, Constant) ratio, and average) may be assigned independently to any of the four outputs. Display Function Analog Function Setpoint I Function Setpoint 2 Function Note: Any unused outputs should be set to zero (OFF) for faster response. - Page 9 For RPM the formula for finding the scaling factor Is: PPR = Scaling Factor Suppose you have a 72 ppr gear. The formula reads: Scaling Factor = 60 = 5 For GPM the formula for finding the scaling factor is: PPG = Scaling Factor where PPG = Pulses Per Gallon Suppose you have a gear operating at 140 PPG.
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Page 10: Dual Channel
2. Dual Channel A. Find the number of pulses per revolution (PPR) produced by the gears or targets being monitored by the speed sensors. B. Calculate the scaling factors by applying the number of PPR’s to the appropriate for- mula for the engineering units you are displaying. For RPM the formula for finding the scaling factor is: PPR = Scaling Factor Suppose you are using Channel A to measure RPM from a 48 tooth gear and Channel... -
Page 11: Defining The Behavior Of The Outputs
MENU Function C 0 = OFF 1 = A 2 = B 3 = A-B 4 = ±A 5 = A/B 6 = B/A 7 = A+B 8 = A-B x 100 9 = B-A x 100 The mathematical functions which can be computed in each mode of operation are listed in Section 2.1. -
Page 12: Fullscole
Full Scale You can determine at which value of the analog function the analog output delivers 20 milllamps to the load. Note: The 0-20mA can be converted to a 0 to 5vdc or 0 to 10vdc signal by placing a resistor across the input of the receiving instrument whose parallel combination with the input resist- ance of the receiver is 250 ohms or 500 ohms respectively. -
Page 13: Latchlng/Auto Reset
Latchlng/Auto Reset You can configure the relays as either Latching or Auto Reset. Latching relays remain in an alarm condition and must be reset manually by using the pushbutton located behind the instrument’s Display door*. Failsafe Auto Reset relays automatically energize when the machine returns to its Non-Alarm state of operation. -
Page 14: Sample Set-Ups
Use Table 1 to select the behavior and type of relay setpoint. The numbers in the table denote the numbers placed in the second digit of Constant C for setpoint 1 and the third digit of Constant C for setpoint 2. SETPOINT TYPE Overspeed Underspeed... -
Page 15: Dual Channel Operation
FPR = Diameter x π = 36 x 3.1416 = l l3.0973 in. Converted to Feet = 9.425 where FPR = feet per revolution = 9.425 C12 = 4. Have the Analog Output Drive an Auxiliary 0-20mA meter with a range of 600 to lOOOrpm. 20mA 600 rpm 1000 rpm... - Page 16 The shaft driving the incoming roller is turning at 1000 rpm, and the shaft driving the outgoing roller is turning at 1250 rpm. You want the tachometer to: 1. Compute Speed A (Incoming roller) and Speed B (out-going roller) in FPM. SF fpm = 60 x π...
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Page 17: Entering The Constants
4.4 ENTERING THE CONSTANTS The Control Panel Is located behind the door of the Display. To gain access to the panel, slide the latch on the Display door to the left. FUNCTION INDICATORS DISPLAY DIGIT THUMBWHEEL CONSTANT THUMBWHEEL TTL/MAG DIPSWITCH A O FULL SCALE R31 PUSH BUTTON (Pb) 4.4.1 Control Features... -
Page 18: Turning On The Power
Alternate Display Mode: While in the run mode (CTW and DTW = 0), you may use the DTW to vlew quan- tities A and B. To view A. set DTW to 1. To view B. set DTW to 2. To view the quantity originally selected for the Display, set DTW to zero. -
Page 19: Entering The Function Constant
To enter C 1. Turn CTW to 2 and then use DTW and Pb to enter the decimal and the number for each digit in the same manner as you did for C 4.4.4 Entering The Function Constant (C 1. Turn CTW to 11. 2. -
Page 20: Analog Output
C. Use chart below to select the location of the decimal. D. Push and hold Pb until the number from the chart appears in the first Display digit. DECIMAL LOCATOR IS 0= No decimal 1= 1888.8 Fixed 2 = 188.88 Auto Range Decimal 3 = 18.888... -
Page 21: Setpoint 2 Output
C. Turn DTW to 1. Push and hold Pb until the value of the flrst digit appears in the first Display digit. D. Turn DTW to 2. Push and hold Pb until the value of the second digit appears in the second Display digit. -
Page 22: Storing The Constants
4.5 STORING THE CONSTANTS Once you have entered the constants, to store them in the TACHTROL ® 3 tachometer’s memory and return to normal operation, turn the CTW and the DTW both to zero and push the Pb. 4.6 SELECTING THE INPUT OPTIONS The two dip switches located between the CTW and the Pb are used to program the instrument for the type of sensor being used. - Page 23 2. NEMA 4X: 3. X STYLE: 4. LESS ENCLOSURE STYLE:...
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Page 24: How To Install The Speed Sensor (S)
6.0 HOW TO INSTALL THE SPEED SENSOR 6.1 MOUNTING THE SPEED SENSOR: In most applications, Passive (not powered) speed sensors will be used. Low speed applications (typically below 100 RPM) will require an Active (powered) or Zero Velocity speed sensor. The mounting for both types of sensors should be able to accommodate several threads and heavy enough to prevent excessive vibration. -
Page 25: Passive Sensors
The pulse signal for channel B enters the instrument through terminals 4 (freq. +) and 5 (freq. -). 6.3.1 Passive Sensors The figure below illustrates the use of a Passive Sensor connected to channel B producing an AC signal. Refer to the AI-Tek Instruments Products Catalog for information. -
Page 26: Active Sensors
6.3.2 Active Sensors The figure below illustrates the use of an Active Sensor connected to channel A producing TTL pulses. Note that the jumper between terminals 2 and 7 references one side of the frequency output to circuit common. Other TTL sensors should be wired the same way. *Note: connect 2 and 7 with jumper 6.3.3 Bi-Directional Sensors:... -
Page 27: Appendix: Time Mode Operation
APPENDIX: TIME MODE OPERATION The TACHTROL 3 tachometer can be configured to display the time between pulses in micro ® seconds by setting the denominator of each scaling factor (C and C ) to zero. The scaled input fre- quency is now as follows: C1 = A x 10 x fA fA x 10... - Page 28 NOISE: Designed to operate in high noise environments (400 V line spikes, and RF immunity to high power UHF portable transmitters In close proximity). DISPLAYS: 4 1/2 digit with minus sign & decimals (positive values indicated by no minus sign). Bright .56”...
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Page 29: Installation And Wiring Practices For Electronic Instrumentation & Control
FOR SCHEMATICS WRITE TO: SCHEMATICS AI-Tek Instruments 152 Knotter Drive P.O. Box 748 Cheshire, CT 06410-0748 INSTALLATION AND WIRING PRACTICES FOR ELECTRONIC INSTRUMENTATION & CONTROL The following practices should be followed in the installation of electronic indicating and control devices in industrial locations. Each installation will be different and generally more care should be exercised as installations become wires that transmit frequencies or pulse coded data. -
Page 30: Warranty
WARRANTY AND RETURN SHIPMENTS STATEMENT The materials ordered and agreed to be furnished by Seller are warranted against defect of material or workmanship for a period of one (1) year from the date of shipment, or for their rated life whichever comes first).
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