[PSUBS-MAILIST] Ammeter / PLC Question
Alan via Personal_Submersibles
personal_submersibles at psubs.org
Mon Jan 22 22:54:15 EST 2018
Thanks Cliff,
I will need to do a bit of research on this one. Analogue volt meters to 50V dc sell
for NZ 20- ; surely there must be a volt meter compatible with a plc for around
that price!
Alan
Sent from my iPad
> On 23/01/2018, at 1:27 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Alan
>
> I use a company called CRMagnetics for DC current and voltage transmitters. See http://www.crmagnetics.com/analog-transducers I have two battery banks on my boat, the main buss (36VDC) and the auxiliary buss(24VDC). I use these hall effect 0-5VDC analog voltage transmitters for the voltage and current in each bank. Specicially I use the CR5310-30 for voltage and CR5210-20 for the voltage and current of the auxiliary bank and CR5310-50 for voltage and CR5210-200 for the voltage and current of the main battery bank. I take each of these signals into a voltage analog input module in in my PLC. These transmitters are a bit pricy at $170-$200 retail from manufacturer but they come up on ebay all the time at a fraction of this cost. These four transmitters have been rock solid.
>
> Cliff
>
>> On Tue, Jan 16, 2018 at 6:32 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> This is the third time I've sent this as it hasn't returned to me.
>> Apologies if you have received it 3 times.
>> Re-thinking the ammeter question.
>> I had suggested using a shunt for measuring amps & Cliff is using some
>> expensive unit based on measuring the magnetic field around the wire.
>> With a PLC could I not just buy an inexpensive Voltage sensor with 4-20Ma output
>> & an inexpensive resistance sensor with 4-20Ma output & calculate the Amps
>> in the PLC program based on these 2 numbers (V/R=A)
>> I believe these items are called conditioners; most are very expensive. Can't
>> understand why as multimeters do a number of measuring functions & are cheap.
>> Does anyone know of a suitable Voltage & resistance sensor, or is this not
>> the best way to do it. Cliff, what are you using for measuring voltage, thanks.
>> Cheers Alan
>>
>>
>> Sent from my iPad
>>
>> Sent from my iPad
>>
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