HYDAC EDS 300 User Manual
Electronic Pressure Switch
EDS 300
User manual
Stand 10.11.2000
1. Functions of the EDS 300
points, switch-back points and
Depending on the model, the unit offers the following functions:
• Display of the actual pressure, maximum value or a switching point.
• Switching the switching outputs according to the pressure and the pre-set switching
parameters.
• Analogue output
• Menu for basic settings (adapting the EDS 300 to the particular application)
• Two different types of programming enable
Three different output models are available:
• EDS 300 with 1 switching output (1.2 A load capacity, no analogue output)
• EDS 300 with 2 switching outputs (1.2 A load capacity, no analogue output)
• EDS 300 with 1 switching output (1.2 A load capacity) and 1 analogue output (4...20 mA)
2. Mounting
The EDS 300 can be mounted directly onto a hydraulic block via the pressure connection
(7/16 SAE 4 female).
When used in critical applications (e.g. strong vibrations or knocks) the pressure connection
must be mechanically decoupled via a Minimess hose. Mounting clamps are available as an
accessory (see point 12.2 "Accessories - for mechanical connection").
The electrical connection should be carried out by a qualified electrician according to the
relevant regulations of the country concerned (VDE 0100 in Germany). The pressure switch
housing must be earthed properly at the same time. When fitted into a hydraulic block it is
sufficient if the block is earthed via the hydraulic system. In the case of Minimess hosemounting, 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.
• Use screened lines (e.g. LIYCY 4 x 0.5 mm
2
)
• The cable screening must be fitted by qualified personnel subject to the ambient
conditions and with the aim of suppressing interference.
• 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 EDS 300
4-digit
digital display
SP1 SP2
PSI
mode
keys for setting switching
additional functions
4. Digital display
After switching on the supply voltage, the unit briefly displays “EdS” followed by the current
2 s
pressure.
In the basic settings the display can be altered. For example, the maximum value can be
permanently displayed. This is the largest measured value 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 pressure can be displayed briefly by pressing the
or the key. This causes
the maximum value to be re-set.
Notes:
• If the actual pressure exceeds the nominal pressure of the unit, it can no longer be
displayed and the display begins to flash.
• If the actual pressure is below 1 % of the nominal range, then 0 is displayed.
5. Output function
t
Safety zone
Safety zone
Off
Switch-back valuet
5.1 Switching outputs
The EDS 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
pressure falls below the switch-back point. The switch-back point is determined by the preset hysteresis (switch-back point = switching point minus hysteresis).
Abbreviations: "S.P.1", "S.P.2" = switching point 1 or 2
"h.Y.1", "h.Y.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, in each
case an upper and a lower switching value can be input which determine the range.
The respective output switches when the pressure 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 (lower switching value minus
three times the increment, see point 5.4). The upper switch-back value is just above the
upper switching value (upper switching value plus three times the increment, see point 5.4).
The area between switching and switch-back value forms a safety zone which prevents
unwanted switching operations from occurring (e.g. triggered by pulsations from a pump).
Example for switching output 1 (normally open function):
P
hi.1 plus 3xincrement
hi.1
On
Lo.1
Lo.1 minus 3xincrement
ON
Off
On
Off
Switching value
Switching value
Switch-back value
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 bar and lower than the nominal
pressure range.
5.2 Analogue output
On specified models, the EDS 300 provides one analogue output with a 4...20 mA signal.
5.3. Setting the Switching Points and Hystereses
• Press "mode" key
2 s
3 s
pressure
set switching point
reached.
• "S.P.1" or "hi.1" is displayed
• Keep pressing the "mode" key until the required parameter is displayed (depending on
he basic setting: "S.P.1", "h.Y.1", "S.P.2", "h.Y.2", "hi.1", "Lo.1", "hi.2" or "Lo.2").
t
• After 2 seconds the actual setting flashes.
• Use the
• Use the "mode" key to call up other parameters, if required, and alter the setting using
the
• If no keys are pressed for 3 seconds, the display changes back and the settings are
saved.
or the keys to alter the setting.
and the keys.
mode
press “mode” key display
until the required
parameter is
Notes:
• If "LOC" appears in the display when trying to alter the settings, programming is disabled.
Corrective action: set programming enable to "ON"
(see point 7 "Programming enable")
• If the
• 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 and/or hystereses
or the key is held down during alteration, the value automatically advances.
=smaller value
=larger value
mode
display
Measuring range
* All ranges given in the table are adjustable by the increments shown.
6. Basic settings
Switching point
in psi
-14 .. 75 -12.5 .. 75.0 -0.5 .. 74.0 0.5
0 .. 150 3 .. 150 1 .. 148 1
0 .. 1000 15 .. 1000 5 .. 990 5
0 .. 3000 45 .. 3000 15 .. 2970 20
0 .. 6000 90 .. 6000 30 .. 5940 30
0 .. 9000 150 .. 9000 50 .. 8900 50
and/or upper
critical value
in bar
Hysteresis and/or
lower critical value
in bar
Increment *
in psi
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