CHAPTER 4
OPERATION
4-13
DN-107P displays series
4.3.7.
Function 5. Tachometer
With the function tachometer we can measure the time that an event is repeated.
Programming the input frequency and the shown value, you can get the necessary result.
To correct the frequency deviations of the input signal and avoid continuous changes in
the display there are two parameters that allow smoothing the variations, the time between data
update and the damping factor. (See
4.2.6 “Function parameters 05, 15 and 25 (Tachometer).”
Parameters 4EL and 7FA)
The updating time is independent from the input frequency. If the input frequency is
stable, we can program an updating time of 0.1s to read an input frequency of 0.05Hz (1
impulse every 20s). By this way the display is updated immediately after the impulse is
received. The updated data between the impulses has the same result.
To use the tachometer to count the turns in a minute (rpm), see examples below.
Connexion: the input signal of the function tachometer is E6, the pin number 6 of
the DB25 connector (see 3.2
“ Wiring inputs” ). The maximum input frequency is 15kHz.
Before using the tachometer, you have to program the parameters. See 0
exit the sequence for modifying parameters, select the last parameter in the menu. Then press
"*".
See the input wiring and examples in 4.3.6
”
Examples:
Show the value of the input frequency without correction.
The input frequency is 100Hz. Variable oscillator. 4 digits display.
Parameter Value
2.FE
0001
1Hz input frequency
3.dl
0001
Display 1 when 1 Hz input frequency
4.EL
001
Update value every 0,1s
5.LI
01
Maximum time without pulses: 1s.
6.Pd
9
Maximum number of decimals shown
7.FA
0
Without average factor
Show the value of the input frequency without correction.
The input frequency is 100Hz. A little stable oscillator. 4 digits display.
Parameter Value
2.FE
0001
1Hz input frequency
3.dl
0001
Display 1 when 1 Hz input frequency
4.EL
030
Update value every 3s
5.LI
01
Maximum time without pulses: 1s.
6.Pd
1
Show 1 decimal
7.FA
0
Without average factor
Summary of Contents for DN-107P
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