Connect DC Ammeter and DC transducer with shunt

Navnag

Stefo

Hello

I need to measure current up to 1600A for 24V DC
if exceeded the tresholdvalue it'snecessary interrupt the circuit.

I suppose, I can use HALL sensor.
Anyone with experience? Can you offer some sample connections are with Siemens components?
Or exists some applications?

thank's for help

Martin

Hello Stefo

You have two options :

a) Use a 75mV Shunt in series of 24VDC power circuit. Use a mV to mA Converter transducer
( WIth isolation ) . the mA signal can be connected to a meter / Analog input of a PLC
This should be sufficient for upto 1600A Current range

I am attaching a drawings extracted from one of the projects where we used Shunt to measure DC current in PLC with good results.

b) Hall effect transducers are usually used for higher current> 1000 amps e.g. for Graphite Baking
Furnaces, Aluminum / Zinc / CopperElectrolyses etc whe currents can go upto 100kA and
beyond. This would of course be a much more expensive that the first option.

The Hall effect Transducers usually provide a mA signal proportional to the DC Current which can
be connected to a meter / PLC Analog Input


Hope this helps

Cheers

Navnag

 Hello ,

in one of my project i have considered one 630A, 100mV DC shunt. Now i want to connect DC Ammeter and DC transducer with shunt so i did wiring in series (see attached file). Will it work correctly ?

Please guide.

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Split from measuring DC current.

In principle yes, however you need to add fuses to your circuit, just to be safe one for each leg of your measuring leads on the shunt, as close as possible to the shunt. Make shure your fuses will have enough breaking capacity for your short ciurcuit current.

I have had luck with devices like this one, but these need to be calibrated and checked periodically, a shunt is more reliable but I just don't like them, I'm always afraid some maintenance monkey will short it with a pipe wrench or something.