Error Messages - IFM Electronic KNM Serie Bedienungsanleitung

The unit returns to the operating
mode. You can repeat the adjustment
to the full state as often as you like.
The adjustment to the full state does
not change the measured value for
the empty state stored previously. This
enables optimum adaptation of the
sensor to changing media in the same
vessel for example.
Note:
The adjustment to the full state is not absolutely necessary for the func-
tioning of the unit but it is recommended. On the basis of the values for
the empty state/full state the internal microprocessor determines the
optimum position of the switching thresholds between the two states.
If you use both adjustment criteria (adjustment to the empty/full states),
the maximum operational reliability possible for your individual applica-
tion is guaranteed.
* The SET function is also possible via the programming wire "CAL" (not for
article KNM.../OF). The programming wire "CAL" is electrically connected with
wire "N" to activate the function.

Error messages:

If the adjustment to the empty/full state is not possible, the red LED
flashes quickly (approx. 2 Hz) after the adjustment attempt.
To erase this error message, press a Teach-In element (no matter which)
once or switch off the operating voltage for a short time. The values
successfully set so far remain unchanged.
Possible reasons for an error message:
• The signal difference between the empty/full state is too small (e.g.
adjustment to the empty and full state without appropriate change
of the level)
• The signal change between the empty and the full state is in the
wrong order (e.g. adjustment to the empty state when the vessel is
full and to the full state when the vessel is empty)
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