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Output function – HYDAC ETS 300 User Manual

Page 4

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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