VEGA VEGASON 71 - 2 … 75 - 2 - Manual (Page 36)

Measurement, Relay output
36 71 - 2 … 75 - 2
Programming example for tendency determination, e.g. 8 cm / Min.
Coordination as described on page 31
Mode for relay output 1 ..................................... • select mode 0 - 44 in MODEFIELD
• program figure 4 in PARAMETER FIELD
• then store with STO-button
Tendency determination for relay output 1................ • select mode 0 - 45 in MODEFIELD
• program e.g. 008.0 (cm / min.) in PARAMETER
FIELD
• then store with STO-button
After programming as above the relay output reacts
as follows:
with reducing rate of level change ≤ 8 cm / min.
> 8 cm / min.
Tendency determination (continuation)
relating to reducing level
example for relay output 1
Requirement:
-
enquire mode 4 (parameter 4) in mode 0 - 44
- program the value of the required tendency
determination in mode 0 - 45
Procedure:
-
relay is not operated
- if the level reduces quicker than programmed in
mode 0 - 45, the relay energizes
- if the filling speed is the same or lower than the
given value, the relay de-energizes again
Note
(for rising or falling tendency determination)
If in case of fluctuating product surfaces of small
values are given for the tendency determination, it
is useful to program additional integration time.
Uncontrolled and undesired operation of the relay
output is then suppressed.
Same procedure for relay output 2 … 4, using
associated modes, see page 35.
Example as guideline:
at tendency determination < 10 cm / min. recom-
mended integration time: 10 … 30 sec.
With < 10 cm / Min. the response time of the
tendency determination can be several minutes.
11 9
10
11 9
10