22
(10)
"Refuel" indicator, yellow
The "Refuel" indicator indicates that refuelling will shortly be required. The display
shows a specific message depending on urgency.
Tank contents less than 20%: indicator lights up yellow
Tank contents less than 10%: indicator flashes yellow
If the tank cover is opened by mistake, the indicator also lights up, with a warning
text. If the message is ignored, it will appear again after one minute.
(11)
"Power ON" indicator, green
The "Power ON" indicator signals that the device is ready for use. Thanks to the
integrated back-up battery, energy can be called up at any time - the vehicle can
be started up.
As soon as the fuel cell has powered up, it takes over and meets the energy de-
mand according to the operating strategy by interacting accordingly with the back-
up battery. The hydrogen in the tank together with the ambient air sucked into the
unit is converted into electricity and water as a combustion product. The back-up
battery primarily caters for low loads and peak demand.
The fuel cell operates in its optimal efficiency range and recharges the back-up bat-
tery with surplus power. Once the back-up battery is fully charged, the fuel cell can
be automatically and temporarily shut down.
(12)
Acoustic signal - only at devices with Fronius Display
As soon as the device’s internal hydrogen sensor trips, an acoustic warning signal
sounds. At the same time, the "Fault" indicator (6) lights up red. This points to a
hydrogen leak in the system.
In addition to the "Fault" indicator a text message can appear, showing the cause
of the fault. Basically any safety relevant fault leads to a shut down of the device
into the safe state. Try a restart as follows:
Press the "OFF" button - as soon as the device has been shut down, the "Power
ON" indicator goes off
After a waiting time of 10 s press the "ON" button
If the "Fault" indicator still lights up after this new start attempt, contact a Fronius-
trained service technician, for checking the device.