AI-Tek Instruments TACHTROL 3, Инструкция по эксплуатации, Страница: 5 / 30

1.0 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.
2.0 INTRODUCTION
The TACHTROL
®
3 tachometer is an applications oriented, single or dual channel computing tach-
ometer which uses the period mode of frequency measurement (time per event).
Used as a single channel tachometer, the TACHTROL
®
3 tachometer measures the rate of industrial
events, such as the rate at which liquid is passing through a pump, or the rate at which bottles are
passing along a conveyor belt. The tachometer displays these rates in engineering units such as FPS
(feet per second), GPH (gallons per hour), RPM (revolutions per minute), and other rates.*
Used as a dual channel tachometer, the TACHTROL
®
3 tachometer can read two unrelated speeds
or can compute six mathematical functions from the input signal frequencies of two related speeds.
In addition, the TACHTROL
®
3 tachometer may be used as a bi-directional tachometer to measure
speed with direction indication (from an AI-Tek bi-directional sensor).
2.1 MATHEMATICAL FUNCTIONS
2.1.1 Single Channel Operation. Used as a single channel instrument, the TACHTROL
®
3
tachometer can compute Speed A or Speed B.
2.1.2 Dual Channel Operation. Used as a dual channel instrument, the TACHTROL
®
3
tachometer can compute unrelated Speed A and Speed B. When Speed A
and Speed B are related, the TACHTROL
®
3 can compute the following math-
ematical functions.
A - B (Difference) A-B x 100 (% Slip)
A
A/B (Ratio)
B/A (Inverse Ratio) B-A x 100 (% Elongation)
A
A + B (Average)
2
2.1.3 Bi-Directional Operation. Used as a bi-directional instrument, the TACHTROL
®
3
tachometer can cA, -A (opposite direction).
* Note: Like most conventional tachometers, the TACHTROL
®
3 tachometer comes
from the factory ready to read RPM from a single, 60 pulse per revolution gear.
2.2 OUTPUTS
Any of the mathematical functions may be assigned independently to:
• An L.E.D. Display which updates every 0.5 seconds.
• An optional output (a current source): either 4 to 20mA or 0 to 20mA.
• 1 or 2 optional Relay Setpoints (2 form C contacts) whlch can be used to trlgger external
events such as alarms. All forms of relay logic can be selected and adjusted In the field.
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