Monitoring The Mains Voltage; Hardware Reset - Graf oneAdvanced Operation Manual

4. The wastewater treatment system's control unit

4.6 Monitoring the mains voltage

The controller detects failed and excessive mains voltage. It detects an incorrect mains voltage
by measuring the input voltage and comparing this with defined limits. The limits defined for an
incorrect input voltage are < 90 Veff and > 250 Veff respectively.
Brief outages (e.g. during thunderstorms) are ignored within a certain time delay. After this time,
the controller disconnects from its power supply.
Action – immediately on incorrect mains voltage:
All relevant data are saved to nonvolatile memory
All outputs and the backlight are switched OFF as a measure to protect these and to
avoid unnecessary draws on the buffer battery.
The error is entered in the log book.
If the mains voltage returns to its defined range within 5 seconds, the controller resumes
the active cycle. A message is entered in the log book.
Action – incorrect mains voltage after 5 seconds:
An intermittent beeping is heard, and the LED flashes red in sync. This beeping can be
deactivated in the menu "Settings"
LED flashes red.
The external warning lamp (if fitted) is not activated.
Once the mains voltage returns to its defined range, the controller is rebooted.
If power has failed for less than 90 minutes, auto mode resumes where it left off. If the power
failure equals or exceeds 90 minutes, the clarified water is discharged and then the sludge re-
turned. Afterwards, the controller switches to auto mode.

4.7 Hardware reset

If the controller no longer responds, its hardware must be reset.
To reset the hardware, press and keep pressed [OK] for 5 seconds.
The controller powers down and reboots.
When the hardware is reset in auto mode, the program resumes where it left off.
The hardware can also be reset in the menu
"Buzzer" "Power failure". In this event, only the
"Service" (code 1311).
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