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and the open contacts of the starter relay. Setting the BAT 2 switch 'on'
energizes a relay connecting BAT 2 to the circuit breaker panel
Essential Buses. Normally, for flight operations, all master switches will
be 'on.' However, the BAT 1 and BAT 2 switches can be turned 'on'
separately to check equipment while on the ground. Setting only the
BAT 2 switch 'on' will energize those systems connected to the circuit
breaker panel Essential Bus. If any system on the other buses is
energized, a failure of the Distribution Bus interconnect isolation diode
is indicated. When the BAT 1 switch is set to 'on,' the remaining
systems will be energized. To check or use avionics equipment or
radios while on the ground, the AVIONICS power switch must also be
turned on.
June 2007
Information Manual 7-69
Cirrus Design Section 7
SR22 Airplane Description
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.
• Note •
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.
June 2007
7-70 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
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 1602, 1644, 1663 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 outside typical operating parameters. The MFD and PFD
receive the voltage signals via the DAU as measured directly off the
Main and Essential Buses.
In the event Main Bus voltage is less than 24.5v or exceeds 32.0v the
MFD will display “Check Main Bus” in a yellow advisory box in the
lower right corner of the MFD.
In the event Essential Bus voltage is less than 24.5v or exceeds 32.0v
the MFD will display “Check Main Bus” in a red advisory box in the
lower right corner of the MFD.
Alternator 1 and Alternator 2 ampere output are shown as text in the
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AIRPLANE INFORMATION MANUAL for the CIRRUS DESIGN SR22(74)
