Operation Manual

LX90xx system Version 4.0 February 2014
Page 18 of 151
 TE/P
static
TE tube
 P
static
Static
 P
total
Pitot or Total pressure
If the P
total
and Static are connected the wrong way around there will be no
integrator reading (average climb) during the flight.
The main display unit is connected to 12 Volt power via the 15-pin SUB-D connector. The
main display unit, vario unit and other vario indicators are connected via the RS485 bus and
the connectors are labelled with “RS485” at each end.
Please ensure that both units are connected correctly before the first power on. The power
wires (red and blue) should be connected to the main display unit.
Even though there is an automatic fuse in the instrument it is VERY IMPORTANT
to use an external fuse (max. 3A). Power supply cables should use a minimum of
0.5 mm² wires. To prevent damage to the main display unit after a short circuit
on the RS485 bus there is an automatic fuse.
If a short circuit occurs then the 57 mm unit will appear not to work anymore. The reason
is not the defect of 57 mm unit – it is due to the hot automatic fuse. Turn off the system
and wait for the automatic fuse to cool down.