HYDAC ETS 3000 - Manual (Page 29)

ETS 3000 User Manual 05 Sep 2008
5
Lo.1
Hi.1 plus 1 % FS
Lo.1 minus 1% FS
P
t
Safety Zone
Safety Zone
On
Off
Off
On
On
Off
Switch-back value
Switching value
Switch-back value
Switching value
hi.1
6.
Output Signals
6.1 Switching Outputs
The ETS 3000 has 1 or 2 switching outputs. The following output signals can be set in the
basic settings:
6.1.1 Switching Point Mode (SP)
One switching point and one hysteresis can be set for each switching output. Each output will
switch when its pre-set switching point has been reached and will switch back when the
temperature falls below the switch-back point. The switch-back point is determined by the
pre-set hysteresis (switch-back point = switching point minus hysteresis).
Abbreviations:
" S.P.1", "S.P.2" = switching point 1 or 2
" HyS.1", "HyS.2" = hysteresis 1 or 2
6.1.2 Window Mode (WIN)
Window mode enables you to monitor a range. An upper and lower switching value which
defines the range can be set for each switching output.
The particular output is switched when the temperature enters this range. The output
switches back when the temperature leaves the range. The lower switch-back value is just
below the lower switching value (lower switching value minus 3x the increment, see section
6.4). The upper switch-back value is just above the upper switching value (upper switching
value plus 3x increment, see section 6.4). The range between the switching value and the
switch-back value forms a safety zone which prevents unwanted switching operations (e.g. in
the case of extremely slow temperature rises).
Example for switching output 1 (normally open mode):
Abbreviations: HI 1, HI 2 = High level 1 or 2 = upper switching point 1 or 2
Lo 1, Lo 2 = Low level 1 or 2 = lower switching value 1 or 2
"FS" (Full Scale) = in relation to the full measurement range
Note:
Window mode cannot function properly (switch on/off) unless all the switching
values (including safety zone) are greater than the lower temperature range and
smaller than the rated temperature range.