User manual

Page 35
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 3000 B Series
3.4.4 Adjustment limits
Adjustment limits are only effective on the related set values, no matter if using manual adjust-
ment or remote control!
Defaults are, that all set values (U, I, P, R) are adjustable
from 0 to 102%.
This may be obstructive in some cases, especially for
protection of applications against overcurrent. Therefore
upper and lower limits for current (I) and voltage (U) can
be set which limit the range of the adjustable set values.
For power (P) and resistance (R) only upper value limits can be set.
► How to congure the adjustment limits
1. While the DC input is switched off, press button .
2. In the menu press , then navigate to “Limit Settings”withthearrowbuttons(↓,↑)andpress
again.
3. In each case a pair of upper and lower limit for U/I or the upper limit for P/R are assigned to the rotary knobs
and can be adjusted. In order to switch to a different pair, press the arrow buttons.
4. Accept the settings with .
The adjustment limits are coupled to the set values. It means, that the upper limit may not be set
lower than the corresponding set value. Example: If you wish to set the upper limit for the current
(I-max) to 35 A while the set value of currently is adjusted to 40 A, then the set value of current
would rst have to be reduced to 35 A or less in order to enable setting I-max down to 35 A.
3.4.5 Manual adjustment of set values
The set values for voltage, current, power and resistance are the fundamental operating possibilities of an electronic
load and hence the two rotary knobs on the front of the device are always assigned to two of the four values in
manual operation. Default assignment is voltage and current. The set values can only be adjusted with the rotary
knobs.
Using the knobs to adjust a value in the main screen changes it immediately and no matter if
the DC input is switched on or off. This is different to set value adjustment in the menu, where
you have to press the “Enter” button to submit changes.
When adjusting the set values, upper or lower limits may come into effect. See section „3.4.4.
Adjustment limits“. Once a limit is reached, the main screen will show a note like “Limit: U-max”
etc. for 1.5 seconds in the status area, while in the menu this is reduced to an exclamation mark.
► How to adjust values with the rotary knobs
1. First check if the value you want to change is already assigned to one of the rotary knobs. The main screen
displays the assignment like this:
2. If, as shown above, the assignment is power (P, left) and current (I, right), and it is required to set the voltage,
thentheassignmentoftheleft-handknobcanbechangedbypressingthearrowdownbutton(↓).
3. Aftersuccessfulselection,thedesiredvaluecanbesetwithinthedenedlimits. Selecting a digit is done by
pushing the rotary knob which shifts the cursor from right to left (selected digit will be underlined):