Instruments - Rotax 912-UL Repair Manual

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c) Charge control circuit
This circuit is also less sensitive to high temperatures than the power circuit and can
therefore be ruined only by increased voltage, (>+250 V or -6 V) or overload on
terminal L, or overload possibly caused by:
inductive voltages,
short circuit or continuous higher load than 3 W,
exchange of terminal C and L
(4 short circuit),
wrongly connected banery.
With faulty charge control circuit the charging indicator light is eitherpermanently
on oroff. Even with faulty charge control circuit (e.g. by overload) the generatorand
regulator (power and control circuit) may remain working correctly.
6.21) Instruments
6.2L.1) Rev-counter
An electric induction pick-up, equally shaped as the ignition pick-ups, will generate
one positive and one negative impulse per revolution of crankshaft. A suitable
tachometer, 0 + 7000 rpm, Aviasport T7K5A, is provided from ROTAX (pan no.
966 073). Connection at pick-up on ignition cover.
The mechanical drive, optional in the ignition coverforatachometerturnsclockwis
at l/4 of the crankshaft speed. For connection, external thread M I 8 x 1 ,5 is provided.
6.21.2) Operating time, hour-rncter
Possibly integrated in the mechanical rev-counrcr, otherwise an electric hour-meter
connected to AC orDC supply may be used. Feed supply 6 - 100 V,6 mA either AC
orDC.
6.21.3) Monitoring of cylinder head temperature
On the cylinder head no. 2 and 3 tapped holes M I 0 are provided for temperature pick-
up or warning sensor.
Readings are taken of the head material but not of the coolant.
Recommended temperature pick-ups:
VDO 323. 80 1/0 1 0/00 I and indicator 50 to 1 50o C VD O 310.27 4/0821001 or waming
switch 150o C, VDO 232.011/ffi51017.
ROTAX.