Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9750-44 3U Electronic Load 0 - 44 A 0 - 750 Vdc 0 - 7000 W 33200408 Data Sheet
Product codes
33200408
Page 77
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
ELR 9000 Series
► How to calibrate the voltage
1.
Adjust the connected voltage source to approx. 102% of the maximum
voltage specified for the ELR device. For the example with an 80 V ELR
this would be 81.6 V for the source. Set the current limitation of the
voltage source to 5% of the nominal current specified for ELR device,
for this example it is 8.5 A. Check again, that for voltage calibration, the
sensing connector on the rear of the device is not connected.
2.
In the display, tap MENU, then „
General Settings“, then go to Page 6
and then tap
START.
3.
In the next screen select:
Voltage calibration. The load will switch the DC input on and start to measure
the input voltage (
U-mon).
4.
The next screen requests you to enter the measured input voltage at
Measured data= from the multimeter.
Enter it using the keypad, that appears when tapping the value. Assure yourself the value is correct and
submit with
ENTER.
5.
Repeat step 4. for the next three steps (total of four steps).
If the externally measured value is somehow too different from the internally measured value (
U-mon), then the
calibration procedure will fail and the parameter can not be readjusted by the user. The same will happen when
trying to calibrate the voltage at an input value other than 100%.
► How to calibrate the current
1.
Adjust the current source to approx. 102% nominal current of the ELR device, for the sample model with
170 A this would be 173.4 A, rounded to 174 A. Make sure the source can provide more current than the
ELR can draw, else the sources’s voltage will collapse. Set the output voltage of the current source to 10%
of the nominal voltage specified for ELR, in the example 8 V, and switch the DC output of the source on.
2.
In the display, tap MENU, then „
General Settings“, then go to Page 6 and then tap START.
3.
In the next screen select:
Current calibration. The load will switch on the DC input and start to measure
(
I-mon).
4.
The next screen requests you to enter the input current
Measured data= measured with the shunt. Enter it
using the keypad, assure yourself the value is correct and submit with
ENTER.
5.
Repeat step 4. for the next three steps (total of four steps).
If the externally measured value happens to be too different from the internally measured value (
I-mon), then the
calibration procedure will fail. The same will happen when trying to readjust the current at an input value other
than 100%.
In case you are generally using the remote sensing feature (Sense), it is recommended to readjust this parameter
In case you are generally using the remote sensing feature (Sense), it is recommended to readjust this parameter
too, for best results. The procedure is identical to the calibration of voltage, except for it requires to have the sens-
ing connector on the rear to be plugged and connected with correct polarity to the DC input of the ELR.
► How to calibrate the remote sensing voltage
1.
Adjust the connected voltage source to approx. 102% of the maximum voltage specified for the ELR device.
For example with an 80 V ELR this would be 81.6 V for the source. Set the current limitation of the voltage
source to 5% of the nominal current specified for ELR device, for this example it is 8.5 A. Check again, that
for voltage calibration, the sensing connector on the rear of the device is not connected.
2.
In the display, tap MENU, then „
General Settings“, then go to Page 6 and then tap START.
3.
In the next screen select:
Sense volt. calibration
4.
The next screen requests you to enter the measured sensing voltage
Measured data= from the multimeter.
Enter it using the keypad, that appears when tapping the value. Assure yourself the value is correct and
submit with
ENTER.
5.
Repeat step 4. for the next three steps (total of four steps).
After calibration you may furthermore enter the current date as “calibration date” by tapping
in the
selection screen and enter the date in format YYYY / MM / DD.
Last but not least save the calibration data permanently by tapping
.
Leaving the calibration selection menu without “Save and exit” will discard calibration
data and the procedure would have to be repeated!