Fault Messages And Rectification; Power Failure - Graf oneAdvanced Operation Manual

11 Fault messages and rectification

Technical plant operation faults (failure of a consumer) are indicated both visually and acousti-
cally. Pressing [OK] deactivates the control unit's acoustic fault signal for 10 minutes. The dis-
played error can be acknowledged when the message is selected with the cursor key [▲] and
[OK] is pressed.
If the power supply fails, an integrated non-mains-dependent power cut detector emits an alarm
which alternates with a visual signal. This fault signal cannot be acknowledged. The acoustic
fault signal can be deactivated in advance in the menu
age".
Please note: This setting is not reset automatically.

11.1 Power failure

The controller KLcontrol.M for wastewater treatment plants comes with a wide-range power sup-
ply delivering alternating voltages of 100–240 V at a frequency of 50–60 Hz. Voltage failure
within this range can be safely offset.
In addition, all relevant data are saved to nonvolatile EEPROM in the controller. In other
words, these saved data can be retrieved after a power failure or controller reset (if undam-
aged).
The following data are saved to EEPROM:
general data (UI language, treatment process settings, current T-step, E number, pressure
measuring method, holiday period, etc.)
calibration data and settings for both pressure sensors
event memory data (information, error, fault)
current cycle settings adopted from the cycle editor
operating hours (valves, UV lamp, phosphate pump, compressor)
11. Fault messages and rectification
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"Settings" > "Buzzer" > "Mains volt-