Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9250-140 3U Electronic Load 0 - 140 A 0 - 250 Vdc 0 - 7000 W 33200406 データシート
製品コード
33200406
Page 68
ELR 9000 Series
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
Uploading of a table from a USB flash drive must use text files in CSV format (.csv). Plausibil-
ity is checked on loading (values not too high, number of values correct),and possible errors
reported in which case the table will not be loaded.
The 4096 values in the table are only checked for size and count. If all the values were to be
graphically plotted a curve would be created which could include significant step changes in cur-
rent or voltage. That could lead to complications in the loading of the source if, e.g., the internal
voltage measurement in the electronic load swings slightly so that the load jumps backwards
and forwards between two values in the table, which, in the worst case, could be 0 A and the
maximum current.
3.9.12.1 Loading UI and IU tables from USB drive
The so-called UI / IU function generator requires to load tables from a com-
The so-called UI / IU function generator requires to load tables from a com-
mon FAT32 formatted USB drive via the front side USB port. The files are
required to have a certain format and to meet following specifications:
•
•
The files names must always begin with IU or UI (not case-sensitive),
depending on the target function you want to load the table to
•
The file must be a text file of type Excel CSV (semicolon as separator)
and must only contain one column with exactly 4096 values without gaps
•
Values with decimal places must use the comma as decimal separator
•
None of values may exceed the related maximum value of the device. For example if you have a 80 V model
you are going to load the table for the UI function, it is assumed that all the values in the table are for voltage
and thus must not be bigger than 80 (the adjustment limits of the device are not in effect here)
•
The files must be stored inside a folder called HMI_FILES with has to be in the root of the USB drive
If the file naming, path and file content specifications are not met, the file is either not recognized at all or rejected.
So it is, for example, impossible to load a UI table (file name starts with UI) for the IU function and vice versa. The
USB drive may contain multiple files of which up to 10 are listed as a selection before loading.
► How to load a UI or IU table from USB flash drive:
1.
Do not plug the USB drive yet or pull it out if already plugged.
2.
Open the function selection menu of the function manager with MENU -> Function Generator -> XY Table
3.
In the next scree select the desired function with either „UI Table“ or „IU Table“.
4.
Configure the global parameters for U, I and P, if necessary.
5.
Tap touch area
and plug the USB drive when requested, in order to select one out of X compatible
files from the drive. In case the file is not accepted, the device will report an error in the display and also tell
what’s wrong with the file.
6.
Once the file is accepted, you will be requested to remove the USB drive.
7.
Submit and load the function with
to start and control it as with other function (also see „3.9.4.1.
3.9.13 Remote control of the function generator
The function generator can be remotely controlled but configuration and control of the functions with individual
commands is different from manual operation. The external documentation “Programming Guide ModBus & SCPI”
explains the approach. In general the following apply:
•
•
The function generator is not controllable via the analog interface
•
The function generator is unavailable if the device in UIR mode (resistance mode, CR)
•
Some functions are based on the arbitrary generator and and some on the XY generator, thus both have to be
configured and used separately