Preis WRCS III Manuel utilisateur

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 1

WRCS III

Wide Range Current Sensor

User Manual

Version 1.5 –18.08.2020

WRCS III 
User Manual 1.5 
Preis Ingenieurbüro GmbH 18.08.2021 Page 2 
 
 
Content 
Block diagram.................................................................................................................................. 3 
User Interface.................................................................................................................................. 4 
1 Display ..................................................................................................................................... 5 
2 Rotary encoder........................................................................................................................ 5 
3 BNC Output Common .............................................................................................................. 5 
4 BNC Output A, B, C .................................................................................................................. 5 
5 Load current connection ......................................................................................................... 5 
Menu navigation ............................................................................................................................. 6 
1 Main menu .............................................................................................................................. 6 
2 Menu “Filter”........................................................................................................................... 7 
3 Menu “Output”........................................................................................................................ 8 
4 Menu “Out Com”..................................................................................................................... 8 
5 Menu “Out A”, “Out B”, “Out C” ............................................................................................. 9 
6 Menu Protection ..................................................................................................................... 9 
7 Menu Fuse............................................................................................................................. 10 
8 Menu Screen Saver................................................................................................................ 10 
9 Menu Version........................................................................................................................ 11 
Function of “Common”-Output..................................................................................................... 12 
Overcurrent protection ................................................................................................................. 13 
Reverse polarity protection........................................................................................................... 13 
Technical specification .................................................................................................................. 14 
 
 

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 3

1Block diagram

12.8uA

Range: 1mA

Filter: 1ms

10A 10A 100A

Shunt

electronic

Switch

ADC

DSP

Filter

DAC

Isolation

12V Power Supply

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 4

2User Interface

12.8uA

Range: 1mA

Filter: 1ms

10A 10A 100A

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 5

2.1 Display

The OLED display shows the actual current and settings.

2.2 Rotary encoder

Select the menu by pressing the knob.

Change settings by rotating the knob.

2.3 BNC Output Common

Current value from 0 .. 200A results in an output voltage of 0 .. 6.2V. Each decade from 1mA to 100A

is 1V on the output. For detailed curves see chapter Function of “Common”.

2.4 BNC Output A, B, C

Current value output as voltage from 0..1V or 0..10V. Configurable by Menu setting “Output”.

The voltage range of the analog digital converters is always 0 .. 10V. By using the 1V range, only 10%

of the analog range is used resulting in higher quantization noise. For better accuracy and better

signal to noise ratio use the 10V range. The 1V range only is implemented for compatibility to current

systems.

2.5 Load current connection

The load current has to flow through the pole terminals in direction of the arrow (from top/red to

bottom/black).

For continuous load currents >70A a minimum wire size of 35mm² is mandatory to avoid additional

heat input from the hot wires into the device.

The connection between the pole terminals is in a high impedance state, if the WRCS III is switched

off. The internal switch has a dielectric withstanding voltage of 55V.

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 6

3Menu navigation

3.1 Main menu

12.8uA Actual measured current

Range: 1mA Actual measurement range

Filter: 1ms Filter time constant of a digital PT1 filter. Adjustable in menu “Filter”.

10A 10A 200A Measurement range of the 3 outputs A, B, C. Configurable in the menus

“Out A”, “Out B”, “Out B”.

Temporal course of the current. The graph shows the relative current in the

current measurement range. If the range changes to the next range, the color of the graph toggles

between red and orange.

12.8uA

Range: 1mA

Filter: 1ms

10A 10A 200A

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 7

3.2 Menu “Filter”

Filter time constant of the digital PT1 (IIR)-Filter.

It is recommended to select a filter time, which is higher than the sample interval of the connected

multimeter/data logger to avoid aliasing.

Additionally, a wrong setting may result in an offset error because of the nonlinear characteristic

curve of the COM output.

Possible settings:

No Filt –ADC-data is put out unfiltered

100µs

1ms

10ms

100ms

10s

Filter time constant

3dB cutoff frequency

No Filt

≈6kHz analog bandwith

100µs

1,59 kHz

1ms

159 Hz

10ms

15,9Hz

100ms

1,59Hz

0,159Hz

10s

0,0159 Hz

Filter

100us

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 8

3.3 Menu “Output”

Current value at the outputs A, B, C. Set to 0..1V or 0..10V.

The voltage range of the analog digital converters is always 0 .. 10V. By using the 1V range, only 10%

of the analog range is used resulting in higher quantization noise. For better accuracy and better

signal to noise ratio use the 10V range. The 1V range only is implemented for compatibility to current

systems.

Possible settings:

0..1V

0..10V

3.4 Menu “Out Com”

Activates/deactivates the common output. For a very fast output of the current value, the output

sample frequency can be increased to 50kHz by using only one output channel.

Possible settings:

-off-

-on-

Output

0..1V

Out Com

-on-

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 9

3.5 Menu “Out A”, “Out B”, “Out C”

Setting of the measurement range for the outputs A,B or C. Additionally the output can be disabled

to increase the output sample frequency to 50kHz.

Possible settings:

-off-

1mA

10mA

100mA

10A

100A

200A

3.6 Menu Protection

Possible settings:

-off- No self protection

Rev-Pol Reverse polarity protection

Overcur Overcurrent protection

-Both- Reverse polarity protection + overcurrent protection

You lose warranty if you disable the protection features.

Out A

100mA

Protect.

-Both-

WRCS III

User Manual 1.5

Preis Ingenieurbüro GmbH 18.08.2021 Page 10

3.7 Menu Fuse

When the set threshold is exceeded, the internal electronic circuit breaker interrupts the circuit. The

filter time set in the Filter menu is used as the trip time constant.

ATTENTION:

If voltages of more than 60V occur when the fuse triggers, this can lead to a defect of the device. This

must also be taken into account when measuring purely inductive loads.

3.8 Menu Screen Saver

Possible settings:

1 min

10 min

1 hour

10 hours

disabled

The display of the device is an OLED. This display technology tends to burn in the bright pixels during

long periods of operation. In order to reduce the aging of the display, especially during long

continuous operation over weeks, the screensaver should be activated. It dims the display to lower

brightness values after a short time.

The device has a presence detection function. If there is movement in front of the device, the

screensaver is deactivated and the display shows the measured value with full brightness. This

detection can also be triggered by people passing by, so that in continuous operation, short set times

achieve the greatest gain in display life.

ScrSaver

1 min

Fuse

25 A

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