Cirrus DESIGN SR20 Information Manual page 302

Section 9
Supplements
avionics power switch must also be turned on. Positioning either ALT
switch to the off position isolates the associated alternator from the
electrical system and the entire electrical load is placed on the
operative alternator. If both ALT switches are in the off position the
entire electrical load is placed on the battery.
Continued operation with both alternator switches off will
reduce battery power low enough to open the battery relay,
remove power from the alternator field, and prevent alternator
restart.
Low-Volts Warning Light
The airplane is equipped with a red LOW VOLTS warning light in the
annunciator panel located on the left side of the instrument panel. An
MCU function module operates the light. The LOW VOLTS warning
annunciator will illuminate whenever bus voltage drops below
approximately 24.5 VDC.
Illumination of the LOW VOLTS warning light and ammeter
discharge indications may occur during low RPM conditions
with an electrical load on the system, such as during a low
RPM taxi. Under these conditions, the light will go out at
higher RPM.
LOW VOLTS warning light operation can be tested by turning the
landing light on and momentarily turning off both ALT master switches
while leaving the BAT master switch 'on.'
ALT FAIL Lights
The airplane is equipped with an amber ALT FAIL light for each
alternator. The lights are located on the left side of the instrument
panel next to the annunciator panel. Illumination of the ALT 1 FAIL or
ALT 2 FAIL caution light indicates that the associated alternator is not
providing proportional power. The lights will also illuminate when the
BAT master switch is 'on' and the associated ALT master switch is
OFF or the associated alternator's circuit breaker is open.
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• Note •
• Note •
Cirrus Design
SR20
P/N 11934-S10
Original: 09-28-99