Stephan Alia - Page 23

®
3 Components and functions
© F. Stephan GmbH SA-112-0106V1.0-WEM-GB 23
Fig. 16: Power Distribution Unit PDU
 Checking input voltage
 Uninterrupted contactless changeover of the power supply sources
with consideration of the voltage hysteresis defined by the software
 Recharging the battery
 Battery test under partial load
 Visual LED test when A
LIA starts up
 Testing the piezo electrical signal transducer when A
LIA starts up
 Switching the compressor on and off
 Communication with the micro controller
 Checking the external air pressure supply
Changeover of the various voltages takes place without any contact.
The current voltage source is indicated by the LEDs on the front of the
unit.
The charge status of the battery is shown by three coloured LEDs (red,
orange and green).
The charge curve is taken into consideration. The charge status can be
read off the LEDS:
 red = 10-40 %
 orange = 40-90 %
 green = 90-100 %
Tasks
Voltage changeover