HYDAC ETS 300 - Manual (Page 4)

5. Output function
5.1 Switching outputs
The ETS 300 has 1 or 2 switching outputs. The following settings can be made under the
basic setting:
5.1.1 Switching point setting (SP)
One switching point and one hysteresis can be set for each switching output. The respective
output switches when the pre-set switching point is reached and switches 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
"hY.1", "hY.2" = hysteresis 1 or 2
5.1.2 Window function setting (WIN)
The window function enables a range to be monitored. For each switching output, an upper
and a lower switching value can be input which determine the range.
The respective output switches when the temperature enters this range. Upon leaving the
range, i.e. when the switch-back value has been reached, the output switches back. The
lower switch-back value is just below the lower switching value (Lo. minus three times the
increment (see table under point 5.4)). The upper switch-back value is just above the
upper switching value (Hi plus three times the increment). The area between switching and
switch-back value forms a safety zone which prevents unwanted switching operations from
occurring (e.g. during very slow rise in temperature).
Example for switching output 1 (normally open function):
Abbreviations: "hi.1", "hi.2" = High level 1 or 2 = upper switching value 1 or 2
"Lo.1", "Lo.2" = Low level 1 or 2 = lower switching value 1 or 2
Note: The window function only operates correctly (switching on and off), when all switching
values (including the safety zone) are greater than 0 °C, and lower than the nominal
temperature range.
5.2 Analogue output
Depending on the model, the ETS 300 has one analogue output with a 4...20 mA signal.
Lo.1
hi.1 plus 3xincrement
Lo.1 minus 3xincrement
°C / °F
t
Safety zone
Safety zone
On
Off
Off
On
ON
Off
Switch-back value
Switching value
Switch-back value
Switching value
hi.1