Avionics Power Switch; Volts And Ampere Meter/Indication - Cirrus SR22 Pilot Operating Handbook

Cirrus Design
SR22
Alternator Switches
The ALT 1 and ALT 2 switches control field power to the respective
alternator. For ALT 1 to start, the BAT 1 switch must be 'on.' Setting the
ALT 1 switch 'on' energizes a relay allowing 28 VDC from the ALT 1
circuit breaker (Main Bus 2) to be applied to voltage regulator for ALT
1. For ALT 2 to start, either the BAT 1 switch or the BAT 2 switch must
be 'on.' Setting the ALT 2 switch 'on' energizes a relay allowing 28
VDC from the ALT 2 circuit breaker (Essential Bus) to be applied to
voltage regulator for ALT 2. Positioning either ALT switch to the OFF
position removes the affected alternator from the electrical system.
Continued operation with the alternators switched off will
reduce battery power low enough to open the battery relay,
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 0002 through 1601, 1603 through 1643 and 1645 through
1662: 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.
P/N 13772-001
Revision A7
• Note •
Section 7
Airplane Description
7-69