Vega VEGATOR 142, Руководство по эксплуатации

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6 Setup
VEGATOR 142 •
46839-EN-190626
6.5 Switching point adjustment, two-point control
with 4 … 20 mA sensor (continuous)
The two-point control is used for example when filling and emptying
is carried out via a pump. The filling of a vessel can be for example
switched on at 10 % and switched off again at 90 %. The output of the
second channel behaves identically like the first channel provided the
same mode is set. By changing the mode, the function of the relays
can be inverted.
With a continuously measuring 4 … 20 mA sensor, the two switching
points can be set to any position between 0 … 100 %. Take note of
the operating instructions when using a capacitive sensor, particularly
the sensitivity setting.
Fig. 8: Application examples with 4 … 20 mA sensor (pressure transmitter or
capacitive rod probe)
Depending on the mode you now adjust the switching points as
described in the following.
1. Make sure that switches 1 and 7 on the DIL switch block are set
to " max. " and switch 6 to " Two-point control ". The switches for
the switch-on and switch-off delay should be set to " 0 s ".
2. The vessel should be empty i.e. only filled until right below the
requested lower switching point
3. Set both potentiometers to the left end position, the two yellow
LED displays do not light
4. Fill the vessel up to the requested lower switching point
5. Set the potentiometer " CH1 " to the right end position, turn the
potentiometer " CH2 " slowly clockwise until the two yellow LED
displays light
6. Fill the vessel up to the requested upper switching point
7. Turn the potentiometer " CH1 " slowly anticlockwise until the two
yellow LED displays extinguish, the controller is now ready for
operation
1. Make sure that switches 1 and 7 on the DIL switch block are set
to " min. " and switch 6 to " Two-point control ". The switches for
the switch-on and switch-off delay should be set to " 0 s ".
2. The vessel should be empty i.e. only filled until right below the
requested lower switching point
Overflow protection (max.
operation)
Dry run protection (min.
operation)