wtw LF 170 - Page 38

Operation LF 170
104
ba54104e09 11/2010
Setting table for limit indicators:
Note
Hysteresis and switching delay prevent frequent switching for
measured values that are close to the limit value.
Setting Selection/Values Explanation
UL or LL Any within the
measurement range
Upper or lower limit.
Setting tolerance according to the measured
value display.
Operating note:
– Set the first (flashing) digit with
<UP><DOWN> and confirm with
<ENTER>.
– Set the other digits in the same way.
HS 0 to 10 % of the
measuring range
Hysteresis.
Difference between switching point and limit
value, if the measured value moves away
from the limit value.
Operating note:
– Set the first (flashing) digit with
<UP><DOWN> and confirm with
<ENTER>.
– Set the other digits in the same way.
td 00:00 ... 59:59 Switching delay (in Min:Sec).
The time period for which the limit value
including the hysteresis must be exceeded
before the relay switches.
Operating note:
– Set the seconds (right flashing digits) with
<UP><DOWN> and confirm with
<ENTER>.
– Then set the minutes (left flashing digits)
with <UP><DOWN> and confirm with
<ENTER>.