Rotax 912 ULS 3 - 8) Connection of the Electric Rev-Counter (Tachometer)

page 118
May 01/2009
Effectivity: 912 Series
Edition 1 / Rev. 1
d04640
INSTALLATION MANUAL
BRP-Powertrain
17.3.8) Connection of the electric rev-counter (tachometer)
See Fig. 67/79.
Feeding wiring to electric rev counter on left side of ignition housing.
- connections: 2 flexible cables 0,5 mm
2
, white/yellow and blue/
yellow (in insulation wrap)
- length approx. 600 mm (24 in) starting from ignition housing.
◆ NOTE: BRP-Powertrain developed especially for this applica-
tion a non-certified electric rev-counter. Certification
to the latest requirements such as FAR or EASA has
to be conducted by the aircraft manufacturer. See also
SI-13-1996, latest issue.
■ CAUTION: The graphs depicting output signals have been deter-
mined and are effective only at the following condi-
tions.
Ambient temperature: 20 °C (68 °F)
Tolerance: ± 5%
The pick-up for the rev-counter generates one pulse per revolution. Pulse shape
and pulse voltage as per recordings (oscillogram).
speed 500 rpm (load 100
ΩΩ
ΩΩ
Ω) speed 500 rpm (load 100 k
ΩΩ
ΩΩ
Ω)
1 Umdr. (rev.)
360°
0
(+V)
(-V)
1
1
2
3
2
3
4
0
(+V)
(-V)
5
5
10
15
10
15
0
(+V)
(-V)
5
5
10
10
1 Umdr. (rev.)
360°
1 Umdr. (rev.)
360°
1 Umdr. (rev.)
360°
0
(+V)
(-V)
50
50
100
100
150
Fig. 79
00219
speed 6000 rpm (load 100
ΩΩ
ΩΩ
Ω) speed 6000 rpm (load 100 k
ΩΩ
ΩΩ
Ω)