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Normally, all master switches will be ON. However, the BAT switch can
be turned on separately to check equipment while on the ground. To
check or use avionics equipment or radios while on the ground, the
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Section 9 Cirrus Design
Supplements SR20
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.
• Note •
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.
• Note •
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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Cirrus Design Section 9
SR20 Supplements
• Note •
Illumination of ALT FAIL caution light 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.
Volt / Amp Meter
A 2¼” combination Volts and Ampere meter is mounted on the right
instrument panel immediately outboard of the oil temperature and
pressure gage. The indicator is internally lighted. 28 VDC for
instrument lighting is supplied through the 2-amp INSTRUMENT
LIGHTS circuit breaker on Main Bus 1.
The VOLT pointer sweeps a scale from 16 to 32 volts. Refer to Section
2 (Limitations) in basic POH for instrument limit markings. The voltage
indication is measured off the essential bus.
The AMP pointer sweeps a scale from –60 to +60 amps with zero at
the 9 o’clock position. The amps indication is derived from current
transducers located in the MCU function modules. Output from each
alternator and the battery is measured. The panel mounted
AMMETER SELECT switch is used to select the desired indication.
When the engine is operating and the master switch is turned on, the
ammeter indicates the charging rate applied to the battery. In the event
the alternators are not functioning or the electrical load exceeds the
output of the alternators, the ammeter indicates the battery discharge
rate. Alternator ammeter indications are positive only.
Ammeter Select Switch
The AMMETER SELECT switch on the instrument panel is used to
select the desired source of electrical current flow to be indicated on
the ammeter. The switch has three positions: ALT 1, BATT, and ALT 2.
Selecting one of the switch positions will cause the amperage output
from that device to be displayed on the ammeter.
Circuit Breakers and Fuses
Individual electrical circuits connected to the Main, Essential, and
Non-essential buses in the airplane are protected by re-settable circuit
breakers mounted on the left side of the center console. The airplane
Essential bus is supplied from the Main Buses through the 20-amp
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Section 9 Cirrus Design
Supplements SR20
ESSENTIAL 1 and ESSENTIAL 2 circuit breakers. Avionics loads on
the Non-essential Avionics Bus and Essential Avionics Bus are
protected by 15-amp AVIONICS circuit breakers connected to the
respective bus through relays energized by the AVIONICS switch.
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 1148-126(97)
