VEGA VEGATOR 532 Ex - Manual (Page 21)

Preferrably as dry run protection system.
1
2
3
Fig. 12: Mode B - Dry run protection
Means with covered max. electrode:
l Relay (channel 1) energizes, connection d10/z10 connected
through relay
l Transistor output (channel 1) conducts
l Control lamp output (channel 1) lights
Means with uncovered max. electrode (single point control) or min.
electrode (double point control):
l Relay (channel 1) denergizes, connection d10/b10 connected
through relay
l Transistor output (channel 1) blocks
l Control lamp output (channel 1) extinguishes
To monitor the electrodes and their circuits, a resistor of 220 kΩ must
be mounted between connection 1 and connection 2 in the connection
housing of the probe, i.e. with single point control, the measuring and
earth electrodes are monitored, and with double point control, the max.
and earth electrodes are monitored.
If you want to use both channels for two separate measurements (no
two-point control), the measuring electrodes are monitored, e.g.
ground and max. electrode of channel 1 (connection d30 and d32) and
ground and min. electrode of channel 2 (connection z30 and z32).
By doing this, a failure is triggered separately for each channel. In case
of failure:
l the channel-specific control lamp fault signal lights
l the relay output of the concerned channel deenergises
l the transistor output of the concerned channel is blocked
l The functions of the inteferred channel remain
For probes with 220 kΩ resistor, a soldering bridge must be closed on
the circuit board of VEGATOR 532 Ex.
l Channel 1 - Soldering bridge BR1
Mode B
Fault signal adjustment,
bridge
VEGATOR 532 Ex • Signal conditioning instrument 21
6 Set up
23435
-EN
-090130