Qube 2 | Installation Manual
11
5.5 Analogue
Inputs
These connect to devices that have a variable voltage output. As the input voltage range (0 to 5
V DC) may not match the sensors range, the input may have to be scaled. In order to scale the
voltages correctly, you should calculate the maximum sensor voltage to scale to 5 V DC at the
ConEx input.
5.6 Digital
Outputs
These outputs are an “open collector” transistor type arrangement. The outputs will pull low when
activated. The outputs have an over current trip. If tripped, the output must be changed to the off
state, or have a power cycle to reset the current trip.
5.7 Battery
Backup
Connections
The Qube 2 has the facility to connect an external battery to allow for battery backup operation.
This allows the Qube 2 to normally run off the main supply, and also trickle charge the backup
battery. When the main power fails or is disconnected, the Qube 2 will continue to run by drawing
power from the backup battery. (e.g. A gel cell type battery).
Connect the Orange wire directly to the positive of the backup battery, and ground the negative
side of the battery at the same point as the Qube 2’s Black wire is grounded. If the Qube 2 is
powered off 24V DC, then the Backup battery must also be 24V DC. If powered from 12V DC the
Battery must be 12V DC.
Note:
As the charging circuit is simplistic, the backup battery will only fully charge when the
vehicle is operating (i.e. the vehicle’s alternator is supplying the higher charging voltage).
Sensor Max. Resistance:
0 to 10k
Rpullup = 1k
¼
W
10k to 20k Rsenor
= 2k2
¼
W
R1 =
0.00015
(V
sensor max
- 5 V DC)
