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Author Topic: isolated analog signal  (Read 1920 times)

maciek

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isolated analog signal
« on: March 24, 2022, 08:30:50 PM »
is the analog signal coming out of the brx plc or the analog madules that you guys have isolated? some of the cheaper dc drives that i like to use require an isolated analog signal.
ideas welcome.
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ADC Product Engineer

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Re: isolated analog signal
« Reply #1 on: March 25, 2022, 07:18:07 AM »
What you need is a signal conditioner.
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Controls Guy

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Re: isolated analog signal
« Reply #2 on: March 25, 2022, 01:08:38 PM »
The onboard BRX analog is floating.    I recently had an app that will field with a variety of unknown existing VFDs, and I was concerned that some might need a floating analog, so I asked BobO and he said they were.

Although, if you have multiple drives connected to the same module, isolators is a better idea.
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maciek

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Re: isolated analog signal
« Reply #3 on: April 02, 2022, 11:21:20 PM »
what does floating analog mean?
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Controls Guy

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Re: isolated analog signal
« Reply #4 on: April 02, 2022, 11:31:14 PM »
It's a differential signal without a fixed reference to ground.  If you wire it to a receiver that is referenced to ground, and the voltage is non-zero, the signal will "float" to meet it and nothing will burn up. Same type of signal you'd get from a signal isolator or signal conditioner.
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BobO

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Re: isolated analog signal
« Reply #5 on: April 03, 2022, 12:50:38 PM »
Not related to the question, but we are prototyping a redesign of Host analog that will eliminate the FPGA. Think it has a fairly decent chance of working, and if so, we'll fast track production.
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"It has recently come to our attention that users spend 95% of their time using 5% of the available features. That might be relevant." -BobO

Controls Guy

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Re: isolated analog signal
« Reply #6 on: April 03, 2022, 05:45:15 PM »
Excellent news!   Thanks for working on that!  Fingers crossed.

Similar specs to the current Host product?
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BobO

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Re: isolated analog signal
« Reply #7 on: April 03, 2022, 11:57:35 PM »
Quote from: Controls Guy on April 03, 2022, 05:45:15 PM
Excellent news!   Thanks for working on that!  Fingers crossed.

Similar specs to the current Host product?

Ideally identical. Analog section the same. Processor and backplane redone, but should be comparable.
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"It has recently come to our attention that users spend 95% of their time using 5% of the available features. That might be relevant." -BobO

maciek

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Re: isolated analog signal
« Reply #8 on: April 05, 2022, 07:24:06 PM »
so to be sure and excuse my ignorance, what you are saying is that i can  take the brx plc onboard analog out signal and wire it directly to one of my kb drives
that require an isolated analog signal and i will not blow anything up? BOB O
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