User Manual

Page 46
ELR 9000 Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
3.3.5 Changing the operating mode
In general, the manual operation of an ELR 9000 distinguishes between three operating modes which are tied
to set value input using the rotary knobs or ten-key pad. This assignment must be changed if one of the four set
values is to be adjusted which is currently not available.
► How to change the operating mode:
1. On the main screen tap the touch area
2. Now one of the three touch areas can be selected:
Setting voltage and current
Setting power and current
Setting resistance and current
Depending on the selection the left rotary knob will be assigned different setting values, the right knob is always
current.
In order to avoid constant changing of the assignments it is possible, e.g with selection R/I, to
change the other values U and P by direct input. Also see section 3.3.6.
Every time when switching to R/I operating mode, the set value of voltage is reset to 0V or to
the adjustment limit U-min and the power set value is reset to nominal or to P-max. This is done
to prevent these values from interfering the resistance regulation. However, both values can
still be adjusted by direct input.
The actual operating mode, while the DC input is switched on, solely depends on the set values. For more informa-
tion see section „3.2. Operating modes“.
3.3.6 Manual adjustment of set values
The set values for voltage, current, power and resistance are the fundamental operating possibilities of an elec-
tronic load and hence the two rotary knobs on the front of the device are always assigned two of the four values
in manual operation. Default assignment is power and current.
The set values can be entered manually in two ways: via rotary knob or direct input.
Operating the rotary knobs changes the set values at any time, whether the input is switched
on or off.
When adjusting the set values, upper or lower limits may come into effect. See section „3.3.4.
Adjustment limits“. Once a limit is reached, the display will show a note like “Limit: U-max” etc.
for 1.5 seconds next to the adjusted value.
Adjustment in operating mode R/I is a special case. The resistance value can only be changed
while the DC input is switched off. Furthermore, every change of the values of R or I has to be
submitted with the touch area .