User manual

Page 74
PSI 9000 2U 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
Varying this parameter shifts the MPP and the PV curve along the Y axis. Also
see diagram to the right. The value Irradiance is here used as a factor for the
current Impp. The curve itself is not permanently re-calculated.
► How to congure the PV table
1. In the function generator menu tap on , then and then
.
2. Adjust the four parameters as required for the simulation.
Irradiation 0..100%
U
I
Uoc
MPP
3. Do not forget to adjust the global limits for voltage and power in the next screen which you can access
with touch area . The voltage (U) setting should be at least as high as U
oc
, or higher.
4. After setting the values for the required signal generation, tap on touch area .
While loading, the IU function is calculated and sent to the internal XY generator. After this, the function is ready
to run.
The function can be saved to USB ash drive as table, as well as read via any of the digital
interfaces. In remote control, the function can not be loaded or controlled.
From the screen where the XY function generator is controlled manually (start/stop), you can go back to the rst
screen of PV table function and use the formerly locked touch area to save the table to USB drive. In order to
do so, follow the on-screen instructions. The table can be used to analyse the values or to visualise it in Excel or
similar tools.
► How to work with the PV table function
1. With an appropriate load connected, for example a solar inverter, start
the function as described in 3.9.4.1.
2. Adjust value Irradiance with the left rotary knob between 100% (default)
and 0%, in order to simulate different light situations. The actual values
on the display indicate the working point and can show whether the
simulation has arrived at the MPP or not.
3. Stop the function run anytime as described in 3.9.4.1.
3.9.14 FC table function (fuel cell)
3.9.14.1 Preface
The FC table function is used to simulate the characteristics of voltage and
current of a fuel cell. This is achieved by setting up some parameters which
dene points on a typical fuel cell curve, which is then calculated as UI table
and passed to the internal function generator.
The user has to adjust value for four support points. The device will request
to enter them step by step, indicating the actual point on screen with small
graphics. When nished, these points will be used to calculate the curve.
Generally, following rules apply when setting up those values:
• U
Point1
> U
Point2
> U
Point3
> U
Point4
• I
Point4
> I
Point3
> I
Point2
> I
Point1
• Values of zero are not accepted
It means, the voltage has to decrease from point 1 to point 4, while the cur-
rent has to increase. In case the rules are not followed, the device will reject
the values with an error and reset them to 0.