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4.5 Inverting the switching logic
Both the first and second channels can be inverted independently. In contrast to an
NVG with PNP outputs, with an NVG with relay outputs it is also possible to use the
NC contact of the changeover relay in addition to the NO.
Channel 1 can be inverted via connection terminal 4 (see connection). The filling le-
vel can be regulated either by emptying or filling.
Channel 2 is inverted via a jumper inside the NVG 200. This can be used either as a
full or empty detector (overflow or dry running protection).
ATTENTION: To invert channel 2, the NVG 200 must be opened. This may only be
carried out in a de-energized state and only by qualified personnel!
4.6 Application examples
Level control in the container with additional dry-running protection
- A container is continuously filled. If the level of the medium rises to the
electrode EO1, the pump is switched on and the container is emptied until the
electrode EU1 is reached.
- The pump is switched off.
- A dry-running electrode on E2 prevents the pump from running dry in the
event of a fault.
Inverted level control in the container with additional overfill protection
- A container is continuously emptied. If the level of the medium drops below the
EU1 electrode, the valve is opened and the container is filled until the EO1
electrode is reached.
- The valve is closed.
- An overfill electrode on E2 prevents the container from overflowing in the
event of a fault.
promesstec GmbH I Niedersachsenstraße 4 I D-48465 Schüttorf I Tel.:+49 (0)5923/ 90 229 0 I Fax:+49 (0)5923/ 90 229 29
E-Mail: office@promesstec.com I Internet: www.promesstec.com
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