Daqu — Manual
4.12
Engine RPM – Tachometer
E
1
2
E
2
1
Y
Y
Z
ROTOR
FFLOW
GND
+5 V
1
2
B
1
B
2
I
1
I
2
3
7
6
5
4
8
GND
+12 V
10
9
12
11
1
+
-
RPM
Trigger Coil (Rotax)
or
Variable Reluctance
FL
1
FL
2
Figure 24:
Connection of
trigger coil
sensor or
variable reluctance
sensor to
Z channel.
Option
Selection/Setting
Channel
Z only
Function
Engine RPM
Sensor
Rotax
Report time
0.2 – 0.5 s
Filter
about 0.5 s
Pulses
1
Prop reduction
1
Table 17:
Settings appropriate for Rotax 912 engine.
no output, install a resistor as well. The resistor can be ordinary 1/4 Watt
carbon resistor.
Let’s assume a Lycoming engine, with Hall sensor and two pulses per RPM.
In this case, the configuration is shown in table 18. Note that there are many
different sensors solutions for Lycomming and Continental engines.
See also section 1.2.2 for more information about channel limitations.
4.12.3
Rotor RPM
Active inductive sensors are most oftenly used for rotor RPM sensors. They
either detect holes in metal or count teeth producing pulses..
Connection schematics were already given in section 3.8. Two schematics
were given, one for NPN sensor, Figure 13 and the other for PNP sensor,
43
©
Kanardia
2019
