S201 AFM
7 - AIRPLANE AND SYSTEMS
DESCRIPTION
7.11 - ELECTRICAL SYSTEM
27/06/2019
SONAIR-S2-D-MAN-006
Page : 7-86
Rev. : A
7.11.2
CHARGE SYSTEM
The alternating current (AC) output of the engine driven alternator is routed to
a rectifier / regulator where it is rectified and regulated, to provide 12V direct
current (DC) output available to the aircraft systems.
Alternators 1 and 2 outputs are as follow:
Alternator
Maximum continuous
output (under 12V)
Regulated
Output Voltage
1 (Internal in Rotax
914F)
14 A / 168 W
13.5 V
2 (External, belt-
driven)
34 A / 408 W
14.3 V
Total
48 A / 576 W
N/A
Charge system output measured at Main Bus is approximately 14 V DC (from
2000 ±250 rpm and higher) when both Alternators are on.
When both alternators are operating in parallel, Alternator 2 will deliver most of
the electrical power due to it’s higher regulated voltage.
This is the normal
operating configuration.
Alternator 1 relay is automatically powered as soon as any of the two Master
switches are on or engine running. It will supply power to main bus as long as
the engine is running, even if Master Switches (BATT and ALT 2) are turned off.
Loss of power to the main bus will result in Alternator 1 relay de-energizing and
disconnecting the charge system output from the battery / main bus.
Alternator 2 charge relay is controlled by ALT 2 Master Switch.
Battery power relay is controlled by BATT Master Switch.
Failure (i.e. with the relay contact opening) of any of the two charge relay will
disconnect the corresponding charge system from the battery / main bus. The
main bus / system voltage (indication on EMS) could show a reduced reading.
Содержание S201
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