User manual

69
Instruction Manual
PSI 8000 3U HS PV Series
EN
Date: 10-28-2011
Figure 12. Adjustment of maximum power
2. Switch the output on. Power is then not adjustable anymore.
3. The DC output will be set to a calculated idle voltage (read
below)
4. Switch the DC-AC inverter on.
The power supply will then turn the adjusted initial values into
the power characteristics curve of the simulated solar panel. The
curve in the gure below depicts an example with initial current
= 8A and initial power (MPP) = 8kW. The U
MPP
and U
Idle
result
automatically according to the U-I characteristics.
Note: Together with this instruction manual you should have
received a CD that contains calculation tools in form of Microsoft
Excel sheets, one for each PV model. Those sheets are used
to enter the same initial values for the simulated solar panel
and to generate and display the resulting characteristics curve.
You can now run a test with the inverter. In order to simulate
different illumination situations, you can
5. Adjust the current set value of the power supply.
When the output is switched off again, power and current are
rest to the initial testing values.
Warning! The DC output voltage (or simulated solar panel
voltage) is depending on the settings of power and current.
Wrong values may result in an output voltage higher than
the DC-AC inverter can take. In order to protect the inverter,
you are advised to always set the overvoltage protection
threshold (OVP) to the maximum inverter input voltage.
See section 7.6.1, item Uovp.
11.3 Notes & limitations
• If the output condition shall not be restored to ON after the
device is powered, disable this feature. See section „7.1.
Dening operation parameters“, item „Output condition after
‚power on‘“.
• During remote control via an analogue interface the preset
values of current and power (see above) can not be restored
after switching the output off, because the set value input
PSEL and CSEL constantly set new values and thus the
preset values in OFF mode will be the last one that were
present on the inputs.
• If PV mode is activated in the setup (menu „Options“), the
function manager (SEQ) is not accessible.
11. PV - Solar panel simulation
The integrated photovoltaics feature enables the power supply
to simulate the characterictics of a solar panel. It‘s a combination
of hardware and software. The PV feature can be enabled and
disabled in the device setup, as described in section „7.8. Acti-
vating the photovoltaics feature“. If disabled, the power supply
acts like a standard power supply unit. If enabled, the power
set value is directly effected by the current set value, resulting
in a voltage-current-power behaviour that is related to a certain
characteristics curve similar to solar panels.
11.1 Special conditions
Following applies for PV operation:
• If the output is switched off, the start values of power and
current can be set
• The power set value can not be changed if the output is on
and is calculated depending on the set value of current
• If the output is on, the power set value display changes ac-
cording to the current set value adjustment
• Remote control of PV operation via digital or analogue in-
terface is possible the same way as with manual control on
the front panel
• When switching the output off again the start values, which
have been set before the output was switched on the last
time, are restored
• The calculated power, which depends on the current set value,
is clipped to the maximum power of the device
11.2 Setup and handling
With the DC-AC-inverter connected, the procedure to run a
simulation of a solar panel is like this:
1. With the power supply DC output switched off and PV feature
activated, you need to adjust initial power and initial current
set values, which characterise the solar panel that is going
to be simulated.
Figure 11. Adjusting the solar panel short-circuit current
Operating the device