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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ELR 9000 HP Series
3.10.3 Method of operation
In order to understand how the function generator works and how the value settings interact, the following should
be noted:
The device operates always with the three set values U,I and P, also in function generator mode.
The selected function can be used on one of the values U or I, the other two are then constants and have a limiting
effect. That means, if, e.g. a voltage of 30 V is applied to the DC input and a sine wave function should operate
on the current with an amplitude of 200 A and offset 200 A, then the function generator will create a sine wave
progression of current between 0 A (min) and 400 A (max), which will result in an input power between 0 W (min)
and 12000 W (max).The input power, however, is limited to its set value. If this were 9000 W then, in this case, the
current would be limited to 300 A and if clamped to an oscilloscope it would be seen to be capped at 300 A and
never achieve the target of 400 A.
Another case is when working with a function which is applied to the input voltage. If here the static voltage is
set higher than the amplitude plus offset then at function start there will be no reaction, as the voltage regulation
limits down to 0 with an electronic load, other than current or power. The correct settings for each of the other set
values is therefore essential.
3.10.4 Manual operation
3.10.4.1 Function selection and control
Via the touchscreen one of the functions described in
can be called
up, configured and controlled. Selection and configuration are only possible
when the input is switched off.
►
How to select a function and adjust parameters
1.
While the DC input is switched off, Tap the touch area
on the main screen.
2.
In the menu overview tap on the touch area
and then on the desired function or
to ac-
cess the next page.
Touch area “Function generator” is locked in R mode (adjustable resistance).
3.
Depending on the choice of function there follows a request to which input value the function generator is
going to be applied (
/
) or, when accessing the battery test function, to select the battery test mode.
4.
Adjust the parameters as you desire, like offset, amplitude and frequency for a sine wave, for example.
For the AC part of a function and if the difference between start and end value of ampli
-
tude or frequency is too low (min.
Δ
Y/
Δ
t), depending on the time that is defined for one
function run, the function generator will not accept the settings and pop up an error.
5.
Also adjust the overall limits of voltage, current and power, which you can access with touch area
.
When entering function generator mode, those global limits are reset to safe values, which
might prevent the function from working at all. For example, if you apply the selected
function to the input current, then the overall current limit should not interfere and should
at least be as high as amplitude.
Setting the various functions is described below. After setting it up, the function can be loaded.