Internal Backup Power With Push Button; Internal Backup Power With External Switch - Kanardia INDU Manual

Altimeter

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Altimeter — Manual

7.4.1

Internal backup power with push button

Indu Altimeter units since S/N:23114 are using knob of the instrument to

enable and disable backup power.

Switch ON The Indu Altimeter switches on when it is powered with ex-

ternal source. At the same time it automatically switches on internal backup

battery. If the main bus power is switched off the instrument will get the

power from internal battery.

At any time it is also possible to turn on the instrument with short press on

the Indu Altimeter knob.

Switch OFF - Manual The instrument does not power off when main

aircraft bus is disconnected. To shut it down manually press the knob of the

instrument for 5 seconds. This will disconnect the internal battery and unit

will shut down.

Switch OFF - Auto If the instrument does not detect any activity it will

automatically switch off after 5 minutes. Couple of seconds before shutdown

the warning is issued on the screen. If you press any knob it will continue to

work for next 5 minutes.

The instrument is detecting change of static pressure to determine if it is

moving. It also detects airspeed if such instrument is present on the CAN

bus.

7.4.2

Older Indu Altimeter units are using external switch to enable and disable

internal backup power source. There are two options for connecting and

operating the instrument.

Solution With One Switch This option is recommended. Here a single

DPST switch is used. This switch allows you to activate two independent

circuits. When switch is on, it simultaneously connects Indu Altimeter with

the system bus and activates the backup system. When the switch is off, both

circuits are disconnected. This gives you cases 1 and 2 from Table 3.

When master is off and this switch is on, the instrument will run on backup

only (case 3). This combination can be used to perform the capacity test.

Important: Use a switch with 1 A DC rating or more.

7.4 Connection Schematics

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