Lodestar Hardware
Manual
Document Ref: UM-8084-101
Issue: A– Rev 8
© Sonardyne International Limited 2013
11
ON/OFF power
switch
The ON/OFF power switch is a push button switch. Press and release to start the
Lodestar. Press and hold for at least 4 seconds to close down the Lodestar.
CAUTION
The ON/OFF power switch controls all power to operate the
Lodestar Attitude and Heading Reference System, including
power from the backup battery. If you operate the switch to
power-off the Lodestar, ALL Lodestar functions will stop after a
short delay.
When you operate the switch to power-on the Lodestar, you
must wait for the settling time before the unit’s heading
measurements conform to the published accuracy specification.
See Lodestar AHRS Operation Manual UM-8084-107.
External supply
fuse
The single panel-mounted fuse holder carries a 20mm time-delay fuse rated at
500 mA(T). This fuse protects the external power connection. Fuse failure does
NOT disconnect the internal backup battery, which will maintain the Lodestar
operation for up to three hours from a fully-charged condition. An LED on the front
panel indicates when the Lodestar is operating on the internal battery.
Indicator LEDs Five LEDs indicate the status of power and communications for the surface
Lodestar.
BATTERY AND CHARGE STATUS LEDS
There are two LEDs to show the status of Battery Charge and of the External
Supply. Table 2 explains how these status LEDs operate¹.
Table 2 – Battery and charge status LEDs
External
power
Battery status
Lodestar
status
Battery
charge
External
supply
Supplied
Charging
Off
Flash green
Solid orange
Fully charged
Off
Solid green
Solid orange
Charging
On
Flash green
Solid green
Fully charged
On
Solid green
Solid green
Not supplied
Discharging
On
Solid red
Off
Low
On
Flash red
Off
Flat
On
Off
Off
1. In normal operation the External Supply LED and Battery Charge LED
should both be green. If the Battery Charge LED shows red, then the
external supply has been lost and the Lodestar is running on the internal
battery, which will provide up to 3 hours of operation from a fully-charged
condition. Switching off will also show red because the switch-off sequence
is controlled by the software.