P/N 11934-003
7-71
Cirrus Design
Section 7
SR20
Airplane Description
remove power from the alternator field, and prevent alternator
restart.
Avionics Power Switch
A rocker switch, labeled AVIONICS, controls electrical power from the
circuit breaker panel bus to the Avionics Bus. The switch is located
next to the ALT and BAT Master switches. Typically, the switch is used
to energize or de-energize all avionics on the Avionics Non-Essential
and 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 switch
should be placed in the OFF position prior to activating the MASTER
switches, starting the engine, or applying an external power source.
Volts and Ampere Meter/Indication
Serials 1268 through 1581:
A 2¼” combination Volts and Ampere
meter is mounted on the right instrument panel outboard of the oil
temperature and pressure indicator. The indicator is internally lighted.
28 VDC for instrument lighting is supplied through the 2-amp INST
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 -100 to +100 amps with zero at
the 9 o'clock position. The amps indication is derived from current
transducers located in the MCU. Output from each alternator and BAT
1 is measured. The panel mounted AMMETER SELECT switch is
used to select the desired indication. When the engine is operating
and the ALT 1 and ALT 2 Master switches are 'on,' the ammeter
indicates the charging rate applied to the batteries. In the event the
alternators are not functioning or the electrical load exceeds the output
of the alternators, the ammeter indicates BAT 1 discharge rate.
Alternator ammeter indications are positive only.
Serials 1582 and subsequent:
Main and Essential Bus voltages are
shown as text in the electrical data block located in the mid-right
section of the MFD and are also displayed in the voltage parameters
block located in the upper left corner of the PFD when voltages fall
Revision A5
Summary of Contents for SR20
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