3 tachometer – B&B Electronics CTA4100A_D - Manual User Manual
Page 19
CTA USER MANUAL
© DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED - 19 - 2007-05-09
2.3 Tachometer
The tachometer in CTA measures the pulse width and displays the current frequency. The measuring and
displaying unit in the tachometer is frequency (Hz); therefore, if you want the value to be displayed in rotation
speed (rpm), you have to convert the frequency into rotation speed. See 2.3.3 for how to convert.
2.3.1 Setting up the parameters in the tachometer
To enter the page for parameter setting of the tachometer, press
in the main menu for more than 3 seconds.
After the setup is completed, press
for more than 3 seconds under any of the parameter page you are in and
return to the main menu.
x
x
x
x
z
Select functions: There are 4 modes in CTA, (left to right) timer, counter, tachometer and timer + counter.
x
x
x
x
z
Select output modes: There are 4 output modes, 2Lo1Lo, 2Lo1Hi, 2Hi1Lo and 2Hi1Hi. For example, when you
select 2Hi1Lo, and assume the first set value is 100 (2Hi) and the second 50 (1Lo), the output value of the
tachometer will be below 100 (2Hi) and above 50 (1Lo) and CTA will not perform an output. If the set value
exceeds the range, CTA will perform an output.
x
x
x
x
x
x
z
Select rotation speed: Maximum 10Kcps; others 5K, 1K, 200, 30 and 1cps.
x
x
x
x
z
Set up the position of decimal point: 0 (no decimal point), 1 (one digit after decimal point), 2 (two digits
after decimal point), 3 (three digits after decimal point)
x
z
Set up pre-scale value: 1.000 (default 1:1) Range: 0.001 ~ 99.999
x
z
Set up the delay time after switching on the power: 0.0 (default). The tachometer will start to run when the
set delay time is due after the power is switched on. Setup range: 0.1 ~99.9 seconds.
x
x
x
x
z
Set up average value of the input filter: The average value is for making the present value detected by the
tachometer more stable. The setup range is 0 ~ 3 (1 = 2 data, 2 = 4 data, 3 = 8 data). For example, if you
select “3”, the system will average the 8 present values from the tachometer to make the present value
displayed on the screen more stable.
x
x
z
Set up minimum width of reset signal: Default = 20ms; 1ms is also selectable.
x
x
z
Select input signal types: NPN and PNP.
Back to Top
2.3.2 Setting up output mode of the tachometer
There are 4 output modes in the tachometer, 2Lo1Lo, 2Lo1Hi, 2Hi1Lo and 2Hi1Hi.
Take 2Lo1Lo for example, assume the set value of output 2 is 100 and 50 for output 1, when the present value
measured by the tachometer is below 50, output 1 and output 2 will both be enabled.
2Lo1Lo 2Lo1Hi
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
OUT1 set value : OUT1 ON
Measurement value
OUT2 set value : OUT2 ON
(LO-LO)
OUT2 set value
Measurement value
OUT1 set value
OUT1
OUT2
Measurement value
OUT1 set value : OUT1 ON
Measurement value
OUT2 set value : OUT2 ON
(LO-HI)