VEGA VEGATOR 122 - Manual (Page 14)

14
6 Setup
VEGATOR 122 •
46108-EN-131217
If this does not correspond to the definition or is completey missing,
the VEGATOR 122 displays a fault.
Note:
When connecting sensors without this defined switching sequence,
the switch-on monitoring must be deactivated.
With these switches you can delay the changeover of the relays by
the set time. This can be useful, e.g. with fluctuating product surfaces,
for preventing unwanted switching commands. The switch-on/off
delays can be set independently of each other. If both switches, e.g.
of the switch-on delay, are activated, the times sum up. Delays of 2, 6
or 8 seconds can thus be adjusted.
Information:
Keep in mind that the switching delay of the sensor and signal condi-
tioning instrument accumulate.
As opposed to simple level detection, two-point control allows the
switch-on and switch-off points to be set at different locations (hys-
teresis). This hysteresis can be defined via the mounting positions,
i.e. the distance between the two sensors. The principle is used, for
example, to control pumps for filling and emptying. Thus, for example,
the filling of a vessel can be switched on at 10 % level and switched
off again at 90 % level. The two output relays behave identically in this
mode.
The measuring system is continuously monitored. The following
criteria are checked:
•
Line break and shortcircuit (two-wire cable)
•
Interruption of the connection cable to the piezo elements
•
Corrosion or damage on the tuning fork (vibrating rod)
•
Break of the tuning fork (vibrating rod)
•
Loss of vibration
•
Too low vibrating frequency
•
Medium penetration into the sensor (from inside vessel)
When level switches VEGASWING/VEGAVIB/VEGAWAVE in two-wire
version are connected, a function test can be carried out. The test key
is recessed behind the front plate of the signal conditioning instru-
ment. Press the test key for at least one second with a suitable object
(screwdriver, pen, etc.).
By pushing the test key, the circuit to the sensor is interrupted and a
restart of the sensor is initiated. Through this, the conditions fault sig-
nal, empty and full alarm are simulated. Check if the switching relays
have really switched according to the LEDs.
If the test result is negative, the red failure LED lights up and the
relays are deenergized. In this case the whole measuring system has
to be checked and repaired.
Switch-on/Switch-off
delay
Two-point control
Function monitoring
Test key