Siemens Sitrans LU-180, Operating Instructions Manual

Page: 33 / 44

Operating
6.9 Fail-safe
SITRANS LU180
32
Operating Instructions, 06/2016, A5E37100674-AA
6.9 Fail-safe
In the event a loss of echo or fault condition exceeds the 'Waiting' period (see Speed of
response (Page 30), or Fail-safe timer (Page 33)), the '?' icon appears and one of the following
fail-safe defaults is immediately effected.
SP default mA
p
mA
i
reading
1 full 22 4 hold
2 empty 4 22 hold
3* hold hold hold hold
p = proportional span
i = inversely proportional span
* = factory setting
6.10 Adjusting the fail-safe setting
To change the fail-safe setting, go to the 'FLS'' display (as described in Adjustments (Page 27)),
and proceed as follows:
1.
Press the "20" key to scroll forward through the available values (1-2-3), and press the "4"
key to scroll backwards.
2. Once you have reached the appropriate value, stop pressing the key. The display
automatically returns to the Run mode (6 secs).
3
seconds
Indicates that the device is now in fail-safe mode.
The current option is shown
(i.e. full)
Press “20” for option 2
(i.e. empty)
6
seconds
Option 2 has now been selected.