User Manual

Page 78
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
3.11.15.6 Interpolation
The interpolation feature can calculate and set intermediate steps when running the PV function in day trend mode,
i. e. DAY E/T or DAY U/I. The calculation is always done between to succeeding points on the day trend curve. The
dwell time of every curve point is adjustable between 500 and 1,800,000 milliseconds (see above, format of the
daytrenddatale).Whiletherearenoextrapointscalculatedwhenusingtheminimumtimeof500ms,following
appliestohigherdwelltimedenitions:
• The number of intermediate steps is determined from the dwell time and spread as equally as possible, where
any of the steps can have its own dwell time between 500 and 999 ms
• The intermediate steps also respect the slope between the current and the next day trend curve point and thus
every step also includes a corresponding value alteration
Visualisation:
Without interpolation - the curve results in steps With interpolation - the curve remains linear
An example: the dwell time of the 3450
th
curvepointisdenedas3minutes,whichis180seconds.Therewillbe
180 / 0.5 -1 = 359 intermediate steps calculated and set until reaching the 3451
st
point. In mode DAY U/I the MPP
voltage changes from 75 V to 80 V and the MPP current changes from 18 A to 19 A. When calculated, this would
meanaΔU/Δtof27.7mV/sandaΔI/Δtof5.5mA/s.Dependingonthedeviceinuse,suchsmallstepsinvoltage
orcurrentmaynotbedoable.However,thedevicewouldtrytosettherstintermediatestepwith75.0138Vand
18.0027 A.
3.11.15.7 Data recording
There is the option to record data during the simulation run, in any mode. The data can be stored to USB stick once
thesimulationisnishedorreadviadigitalinterface,whichevenallowsforreadingthedatawhilethesimulation
is still running.
Aslongasthesimulationisrunning,thedevicewillrecordonedatasetevery100msintoaninternalbu󰀨er.This
interval isn’t adjustable. The max. number of data sets, here also called indexes, is 576,000. This results in a
max. record time of 16 hours. The indexes are internally counted with every new record. When reaching the max.
number, the index will restart from 1, overwriting former data. Every index will contain 6 values.
WhenconguringthePVsimulation,therecordingfeatureislockedatrst(buttongreyedout).Onlywhenstopping
thesimulationandleavingthecontrolscreenbacktotheconguration,thebuttonbecomesaccessible.Itthen
allowstostoreaCSVwithaspecicnumberofrows.Thisnumberdependsonthecurrentindexcounter.Contrary
to remote control where it’s possible to address every index of the max. 576,000 the save to USB feature will always
store all indexes between 1 and the counter. Every next simulation run also resets the counter.
CSVleformatwhensavingtherecordeddatatoUSBstick(intheexampleallvaluesarewithunit):
Index = Ascending number
Uactual = Actual voltage on the DC output
Iactual = Actual current on the DC output
Pactual = Actual power on the DC output
Umpp / Impp / Pmpp = Voltage, current and power in the
MPP of the currently calculated PV curve