13
Setting Examples
MODE -01- (RPM or Rate Measurement)
The DT-5TXR/5TS units are fully scalable, which means that
RPM can be used to display linear speed in many units,
i.e. ft/m, yd/m, m/m, in/m etc. Please use the following
example as a guide for programming this feature.
Suppose a motor drives a roller through a speed reducer
and the speed of the roller is 100 RPM when the speed
of the motor is 1,700 RPM (due to load, in this case the
roller). The roller feeds a belt that carries material from
point A to point B and we want to monitor the speed of
the belt in ft/m at all times.
The following are known: (refer to the mode -01-
parameters table on the bottom of page 7)
a) Parameter 1 = 1 p/r (one marker on the face of the
roller)
b) Parameter 2 = 100 RPM (due to speed reducer)
c) Parameter 3 = ? (ft/m)
Parameter 3 is calculated by determining the
circumference of the roller and multiplying by the RPM
(parameter 2). The circumference can be determined by
multiplying
π
times the diameter (C=
π
D). The diameter
must be measured in whatever unit needs to be
monitored. Because ft/m needs to be monitored, the
diameter needs to be measured in feet. If it is assumed
that the roller is one foot in diameter (D=1) and
π
=3.14159, then the circumference would have to be
3.14159 ft. This number would then be multiplied by
100 (parameter 2) to arrive at 314.159 ft/m, parameter 3.
Now:
a) Parameter 1 = 1 p/r
b) Parameter 2 = 100 RPM
c) Parameter 3 = 314.159 ft/m
After these parameters have been programmed (see
page 8), feet per minute will be displayed and will
fluctuate with the changing RPM.
For example: if the RPM drops to 50, then the display
will show 157.079 ft/m.
In the example given, parameters 4, 5 and 6 needed no
change; these are adjusted according to operator
preference.
D
Parameter 4 is selectable and is used when there is a
steady increase/decrease in speed and the operator wants
to observe the changes (in this case higher update times
are selected) or if the speed changes rapidly within certain
limits (this may bother the observer) a lower update time
is selected.
Parameter 5 is set according to how quickly the operator
wants to see the display go to “0” after the sensor stops
producing an output.
Set parameter 6 according to the sensor being used.
MODE -02-
As stated in the previous example, the DT-5TXR/DT-5TS
units are fully scalable. This is true for not only rate
measurement but also time measurement. The following
is an elapsed time measurement/monitoring example.
The elapsed time for curing a product in a commercial
oven is critical and must be monitored. From the oven’s
specifications it is possible to discover either the velocity
(speed) that the conveyor moves product or the amount
of time that the product has to be in the oven.
NOTE: If neither of these can be found, simply use a hand
held tachometer to measure the conveyor belt speed.
From either one of the above methods the 5m-long oven
is determined to have a belt speed of 2.8m/m. In this
example a rotary pulse generator is being used that is
moving at 1,200 RPM and generating 60 pulses per
revolution. Therefore the following facts are known:
a) The length of the oven is 5 meters
b) The speed of the pulse generator is 1,200 RPM
(parameter 2)
c) The p/r of the pulse generator is 60 pulses
(parameter 1)
d) The belt speed is 2.8 m/m
Use the formula t=d/v, to determine the amount of time
that the product will spend in the oven (parameter 3).
Dividing 5 (length of oven) by 2.8 (speed of oven
conveyor) equals 1.786 min (107 seconds or 1 min and
47 seconds), parameter 3 (see page 9 for programming).
Parameters 4 and 5 should be set to the operator’s
preference. Set parameter 6 according to the sensor
being used.
Now the unit will display time as it relates to the RPM.
For example, if the RPM falls to 600, the display will show
214 seconds.
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