DFE WebHandler 3 Instruction Manual page 25

Figure 21 - PULSE TACHOMETER CARD SWITCHES AND ADJUSTMENTS
1. Initial Switch Settings
WARNING!! To prevent possible damage to the circuit card, set the SW601 switches as shown below BEFORE
installing the card and BEFORE running the machine!
2. Determine the maximum pulse amplitude of pulses from the
with it should give this data or allow you to calculate it. The amplitude can also be measured using an
oscilloscope. Set the SW601 switches according to the maximum amplitude using the chart below.
3. Determine the frequency of the
best method. Look on the pulse tach data sheet for the number of pulses per revolution and multiply by
the revolutions per second, considering any gear ratios that may be used.
4. Set the SW602 switches according to the frequencies in the previous steps.
Note: Opening switch 2 disables the
INITIAL SW601 SETTINGS
1 - Closed
2 - Open
3 - Open
4 - Closed
SW601 SWITCHES
Pulse Amplitude (volts)
.25 - 2.0
1.0 - 50.0
LTACH pulse tach at maximum machine speed. Calculation is usually the
SW602 SWITCHES
Frequency
180 Hz - 1.7 KHz
1.1 KHz - 40 KHz
output. Opening switch 3 disables the
RTACH
19
LTACH pulse tach. The data sheet that came
LTACH
3 4
Closed Open
Open Closed
LTACH
3 4
Closed Closed
Closed Open
output.
LTACH