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7-52 P/N 13999-002 Info Manual
Section 7 Cirrus Design
Airplane Description SR20
Avionics Power Switch
A rocker switch, labeled AVIONICS POWER, controls electrical power
from the airplane primary bus to the avionics bus. The switch is
located next to the ALT and BAT Master switches and is ON in the up
position and off in the down position. Typically, the switch is used to
energize or de-energize all avionics on the Avionics Non-Essential and
Avionics Essential buses simultaneously. With the switch in the off
position, no electrical power will be applied to the avionics equipment,
regardless of the position of the master switch or the individual
equipment switches. For normal operations, the AVIONICS POWER
switch should be placed in the off position prior to turning the master
switch ON or off, starting the engine, or applying an external power
source.
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) 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 a current
shunt located in the electrical system master control unit (MCU). 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 alternator is not functioning or the electrical load exceeds the
output of the alternator, the ammeter indicates the battery discharge
rate.
September 2011
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