User manual

Page 73
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 9000 B HP Series
3.10.14.2 Mode MPP2
This mode tracks the MPP, so it is closest to the operation of
a solar inverter. Once the MPP is found, the function won’t
stop, but try to track the MPP permanently. Due to the nature
of solar panels this can only be done below the level of the
MPP. As soon as this point is reached, the voltage starts to
sink further and so does the actual power. The additional
parameter ΔPdeneshowmuchthepowermaysinkbefore
the direction is reversed and the voltage starts to rise again
until the load reaches the MPP. The result are zigzag shaped
curves of both, voltage and current.
A typical curve display is shown in the picture to the right.
For the example, the ΔP was set to a quite small value, so
the power curve looks almost linear. With a small ΔP the
load would always track close to the MPP.
FollowingparameterscanbeconguredfortrackingmodeMPP2:
Value Range Description
U
OC
0...Nominal value of U Voltage of the solar panel when unloaded, taken from the panel specs
I
SC
0...Nominal value of I Short-circuitcurrent,max.speciedcurrentofthesolarpanel
Δt 5 ms...65535 ms IntervalformeasuringUandIduringtheprocessofndingtheMPP
ΔP 0 W...0.5 P
Nom
Tracking/regulation tolerance below the MPP
3.10.14.3 Mode MPP3
Alsocalled“fasttrack”,thismodeisverysimilartomodeMPP2,butwithouttheinitialstepwhichisusedtond
theactualMPP,becausemodeMPP3woulddirectlyjumptothepowerpointdenedbyuserinput(U
MPP
, P
MPP
).
In case the MPP values of the equipment under test are known, this can save a lot of time in repetitive tests. The
rest of the function run is the same as with MPP2 mode. During and after the function, the least acquired MPP
values of voltage (U
MPP
), current (I
MPP
) and power (P
MPP
) are shown in the display.
FollowingparameterscanbeconguredfortrackingmodeMPP3:
Value Range Description
U
MPP
0...Nominal value of U Voltage in the MPP
I
SC
0...Nominal value of I Short-circuitcurrent,max.speciedcurrentofthesolarpanel
P
MPP
0...Nominal value of P Power in the MPP
Δt 5 ms...65535 ms IntervalformeasuringUandIduringtheprocessofndingtheMPP
ΔP 0 W...0.5 P
Nom
Tracking/regulation tolerance below the MPP
3.10.14.4 Mode MPP4
Thismodeisdifferent,becauseitdoesnottrackautomatically.Itratheroffersthechoicetodeneausercurveby
setting up to 100 points of voltage values, then track this curve, measure current and power and return the results
in up to 100 sets of acquired data. The curve points can be entered manually or loaded from USB stick. Start and
endpointcanbeadjustedarbitrarily,Δtdenesthetimebetweentwopointsandthefunctionruncanberepeated
up to 65535 times. Once the function stops at the end or by manual interrupt, the DC input is switched off and the
measured data is made available. After the function, the acquired set of data with the highest actual power will be
shown in the display as voltage (U
MPP
), current (I
MPP
) and power (P
MPP
) of the MPP. Going back on the screen with
RETURN then allows for data export to USB stick.
FollowingparameterscanbeconguredfortrackingmodeMPP4:
Value Range Description
U
1
...U
100
0...Nominal value of U Voltagefortheupto100userdenablecurvepoints
Start 1-100 Start point for the run of x out of 100 subsequent points
End 1-100 End point for the run of x out of 100 subsequent points
Δt 5 ms...65535 ms Time before the next point
Rep. 0-65535 Number of repetitions for the run from Start to End