HYDAC EDS 601 User Manual

Page 9

Altering the setting of the display filter affects the interval in which the

displayed value is renewed.
"FAST

renews the display value every 0.2 seconds.

"MED

renews the display value every 0.33 seconds.

"SLOW

renews the display value every 0.66 seconds.

The setting of the display filter does not affect the reaction time of the relay

outputs or the analogue output, but merely serves to steady the display in

the event of rapid pressure fluctuations.

The software version can only be viewed, not altered. The display serves

as a means of identifying the unit version in the event of queries.

Altering the measuring range

Please note:

Altering the measuring range merely means that another

scale is selected. The nominal pressure range of the

pressure switch always remains the same and must not be

exceeded.

Example:

If the measuring range of an EDS 601-250-000 (nominal

pressure range 250 bar) is changed to 0 ... 738, the display

value of 738 corresponds to a pressure of 250 bar.

To alter the measuring range follow the same procedure as for the basic

settings, but do not release the PROG key when "BASE stops flashing, only

when "RANG stops flashing.
The measuring range has three settings:
1. The number of decimal places ("POIN.)

2. The lower measuring range limit ("RAN.L.)

3. The upper measuring range limit ("RAN.H.)
To select and alter the settings and to exit the setting follow the procedure

outlined in the "Basic settings chapter. If the measuring range is changed so

much that the set switching points or switching hystereses are now outside the

new range, they are automatically set to the standard setting (switching

hysteresis: 1 %, switching point 1: 50 % and switching point 2: 75 %). The error

message "ER.04 is displayed to indicate this.

Altering the calibration

The EDS 601 can be calibrated at any time without opening the housing.The

calibration covers 3 areas:

the sensor input

the analogue output for the "Volt setting

the analogue output for the "M.Amp. setting

Note:

The calibration menu should only be used by a qualified person.

Improper handling can lead to a loss of accuracy of the pressure

switch.

To access the calibration menu all 3 keys must be held down as the unit is

switched on. After approx. 5 seconds "CALI. begins to flash in the display. After

a further 5 seconds the flashing stops. If the keys are now released the

calibration menu can now be used.

Calibrating the sensor input
When the menu option "AD.L is selected the current lower calibration value is

displayed for approx. 2 seconds followed by the current value of the A/D

converter. Set the pressure to the lower limit (i.e. 0 bar) and press the D or Ñ

key. If the value is within the permitted tolerance range "NEW is displayed. The

lower limit is now calibrated. Otherwise, "FAIL is displayed and the sensor will

not be calibrated.
The same applies for "AD.H with regard to the upper calibration value.

Calibrating the analogue output
The menu option "OUTP selects whether the output should be calibrated as

current output (setting "M.AMP) or voltage output (setting "VOLT). The D or Ñ

key can be used under option "DA.L and "DA.H to change the value of the

analogue output. The value can be "DA.L 0V or 4 mA and "DA.H 10 V or

20 mA.

Exiting the calibration
This menu is not exited automatically. To exit the calibration select option

"END, set it to "YES and press the PROG key.

3.4.

3.5.