HYDAC ETS 300 User Manual

Electronic Temperature Switch
ETS 300

User manual

Date of issue: 03.12.2001

1. Functions of the ETS 300

The ETS 300 is available with a built-in and with a separate temperature sensor. Depending
on the model, the unit offers the following functions:

· Display of the actual temperature, maximum value or a switching point.

· Switching the switching outputs according to the temperature and the pre-set switching

parameters.

· Analogue output

· Menu for basic settings (adapting the ETS 300 to the particular application)

· Two different types of programming enable

Four different output models are available: with one switching point, with two switching points
and both models can also have an additional analogue output signal 4 .. 20 mA.

2. Mounting

The ETS 300 with built-in sensor can be mounted directly onto a hydraulic block via the male
thread (G1/2 A, DIN 3852). The temperature sensor is built into the stem which is located
before the thread. In order for temperature to be measured correctly, please ensure that this
stem is in the fluid.
The ETS 300 with separate sensor is mounted to the wall by means of a clamp which is
available as an accessory (see Point 12.2 "Accessories - for mechanical connection").
The electrical connection must be carried out by a qualified electrician according to the
relevant regulations of the country concerned (VDE 0100 in Germany). The temperature
switch housing must be earthed correctly. When fitted into a hydraulic block it is sufficient if
the block is earthed via the hydraulic system. In the case of wall-mounting, the housing
must be earthed separately.

Additional assembly notes which, from experience, reduce the effect of electromagnetic
interference:

· Make line connections as short as possible.

· Direct proximity to connecting lines of user units or electrical or electronic units causing

interference must be avoided as far as possible.

3. Operating keys on the membrane keypad

HYDAC ETS 300

3-digit
digital display

SP1 SP2

mode

keys for setting switching
points, switch-back points and
additional functions

4. Digital display

After switching on the supply voltage, the unit briefly displays “ETS” and then displays the
actual temperature.

2 s

In the basic settings the display can be altered. For example, the maximum value can be
permanently displayed. This is the highest temperature which has been recorded since the
unit was switched on or was last re-set. A switching point can likewise be permanently
displayed or the display can be set to be dark.
Depending on the setting, "TOP", "S.P. 1", "S.P. 2" or "OFF" appears briefly on the display
following the switch-on message.
The actual temperature can be displayed briefly by pressing the or the key. This
causes the maximum value to be re-set.

Notes:

· If the actual temperature exceeds the nominal temperature of the unit, it can no longer be
displayed and the display begins to flash.

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):

°C / °F

hi.1 plus 3xincrement

hi.1

On

Lo.1

Lo.1 minus 3xincrement

Off

Safety zone

Safety zone

On

Off

Switch-back value
Switching value

Switching value
Switch-back value

t

ON

Off

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.

5.3. Setting the switching points, hystereses and/or critical values for the window

function

· Press "mode" key

· "S.P.1" or "hi.1" is displayed

· Keep pressing the "mode" key until the required parameter is displayed (depending on

the basic setting: "S.P.1", "hY.1", "S.P.2", "hY.2", "hi.1", "Lo.1", "hi.2" or "Lo.2").

· After 2 seconds the actual setting flashes.

· Use the or the keys to alter the setting.

· Use the "mode" key to call up other parameters, if required, and alter the setting using

the

and the keys.

· If no keys are pressed for 3 seconds, the display changes back and the settings are
saved.

H

mode

2 s

press “mode” key until display
the required parameter

is reached.

Notes:

· If "LOC" appears in the display when trying to alter the settings, programming is disabled.
Action: set programming enable to "ON"
(see point 7 "Programming enable")

· If the or the key is held down during alteration, the value automatically advances.

· If a setting has been altered, "PRG" appears briefly in the display when the display is

switched over. The new setting is then saved in the unit.

5.4 Setting ranges of the switching points, hystereses and/or critical values

set switching point

= decrease value
= increase value

mode

temperature

display

3 s

G

Version Measurement

range

Built-in
sensor

-25 .. 100 °C

(-13 .. 212 °F)

Switching point

and/or

upper critical value

-23.5 .. 100 °C
(-10 .. 212 °F)

Hysteresis and/or
lower critical value

0.5 .. 123 °C
(1 .. 223 °F)

Increment *

0.5 °C
(1 °F)

Separate

sensor

* All ranges given in the table are adjustable by the increments shown.

- 30 .. 150 °C

(-22 .. 302 °F)

-27 .. 150 °C

(-16 .. 302 °F)

1 .. 178 °C

(2 .. 320 °F)

1 °C

(2 °F)

6. Basic settings

In order to adapt the unit to a particular application, the function of the ETS 300 can be
altered via several basic settings. These are combined in one menu.

6.1 Altering the basic settings

Important note: when the menu is activated no switching operations are carried out.

Switch off supply voltage or disconnect the unit from the supply voltage.

H

mode

3 s

press “mode” key and
hold down. Switch
on supply voltage
(hold key down f or 3s)

To close the basic setting menu:

Call up the menu point "END", set to "YES", the ETS 300 returns to the normal display
mode after 2 seconds.

Note:

· If after about 50 seconds no keys have been pressed, the menu automatically closes
down. Any changes which may have been made will not be saved.

display
(release
“mode” key)

press “mode” key until th e
required menu point app ears
in the display

(for summary, see 6.2)

mode

H

2 s

Use or to alter

setting, then select next

.

menu point

.

mode

G