19
At the same time the actual voltage of the aircraft system
is displayed. After a few seconds both displays switch back
to altitude and real-time. When the ALPHAMFD switches
over to emergency power for any reason, the Voltmeter
indicates the voltage of the back-up battery.
WARNING! When the ALPHAMFD switches over to emergency power
supply by the back-up battery, the voltage of the back-up battery is indicated.
If this value drops to 7,2 V or below you must IMMEDIATELY exchange the
battery. You MUST NOT fly with a voltage of 7.2 V or below because the
emergency power supply can not be guaranteed!
4.7 Real-Time
The time is shown in hh:mm.
Time and date are set in SET-Modes 19, 20, and 21.
5 Engine Management
5.1 Engine RPM
Engine RPM is digitally indicated to max. 9980 RPM
with a resolution of 20 RPM.
5.1.1 RPM Measurement RPM Port
Most engines have a dedicated 12 V port for measuring the engine RPM. In SET-Mode
18 the ALPHA
ALPHAALPHA
ALPHAMFD can be programmed to read the RPM signal depending on engine
type and ignition sequence. It is possible to set a factor "multiplied by 4, 2, or 1 or
"divided by 6, 4, 3, 2".
The generators of Rotax 582 and 503 engines give 6 pulses per revolution, so the
ALPHA
ALPHAALPHA
ALPHAMFD must be set to "divided by 6" for use with these engines.
WARNING! Do not disconnect the power supply of the ALPHA
ALPHAALPHA
ALPHAMFD before
switching it off. If the ALPHA
ALPHAALPHA
ALPHAMFD is disconnected before it is switched off, it
cannot write information (like engine hours) into its memory and the values
are permanently lost. It will switch over to the emergency power supply and
unnecessarily drains the back-up battery!
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