Meanwell rd-35b simple question

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RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

tblough wrote: Wed Jul 10, 2024 7:09 am What does continuity mean? COM and earth are supposed to be connected and have very low resistance (<1ohm). With the power off and V1 disconnected, COM and V1 will show a high resistance (>1K ohm).

If you have low resistance (<1 ohm) between your disconnected V1 wire and COM you have a short in your wiring. If you have low resistance between COM and the V1 terminal when no wire is connected then you have a bad power supply.

What is the voltage between COM and V1 with the wire disconnected and the PSU powered?

Continuity is the presence of a complete path for current flow
Mattwo said... on the bench continuity between v1 and com yes.. if com is connected to Earth then continuity between v1 and earth is also yes.

To my limited knowledge.. v1 and earth should not have continuity
I most likely have a bad psu..
I will also check what the voltage is between COM and V1 with the wire disconnected and the PSU powered


Mattwo_support
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Re: Meanwell rd-35b simple question

Post by Mattwo_support »

I would also like to add that on acorn and acorn six the com and ground on the board is connected by a ferrite. My acorn measures about .2ohm between them. Even if you don't have the jumper between the com and earth of the PSU, we highly recommended that you do, your meter will beep.


RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

Mattwo_support wrote: Wed Jul 10, 2024 9:49 am I would also like to add that on acorn and acorn six the com and ground on the board is connected by a ferrite. My acorn measures about .2ohm between them. Even if you don't have the jumper between the com and earth of the PSU, we highly recommended that you do, your meter will beep.
My PSU was wired by you guys and you are the experts so it stay wired as you have done it.
New question.. am I wrong by saying ..
Continuity between V1 and Earth is a short ?


tblough
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Re: Meanwell rd-35b simple question

Post by tblough »

I'll ask again. With your wire on V1 disconnected, what is the voltage between COM and V1 when the PSU is on?
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.


RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

tblough wrote: Wed Jul 10, 2024 7:18 pm I'll ask again. With your wire on V1 disconnected, what is the voltage between COM and V1 when the PSU is on?

I haven't forgotten your question Tom ..
I'll be back trying to get it to work on the weekend, I will check Saturday and will let you know


RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

tblough wrote: Wed Jul 10, 2024 7:18 pm I'll ask again. With your wire on V1 disconnected, what is the voltage between COM and V1 when the PSU is on?
I have 5.089v between com and v1 with the power on and v1 disconnected


RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

tblough wrote: Wed Jul 10, 2024 7:18 pm I'll ask again. With your wire on V1 disconnected, what is the voltage between COM and V1 when the PSU is on?

I've attached pics.. let me know if that answers your questions
Attachments
20240713_110739.jpg


tblough
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Re: Meanwell rd-35b simple question

Post by tblough »

With the power supply plugged in, and nothing connected, what is the VOLTAGE between V1 and COM? You are measuring the internal resistance of the complex circuit of resistors, capacitors, inductors, and semiconductors, which tells you nothing unless you know what measurement should be, or have another known good one to compare to.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.


suntravel
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Re: Meanwell rd-35b simple question

Post by suntravel »

Com to V1 should be 5V and V2 24V

Uwe


RemyM
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Re: Meanwell rd-35b simple question

Post by RemyM »

tblough wrote: Sat Jul 13, 2024 5:55 pm With the power supply plugged in, and nothing connected, what is the VOLTAGE between V1 and COM? You are measuring the internal resistance of the complex circuit of resistors, capacitors, inductors, and semiconductors, which tells you nothing unless you know what measurement should be, or have another known good one to compare to.

Scroll up ....
I wrote.. the voltage between COM and V1 with wires disconnected and power on is 5.089v .. I just didn't take pic

You also asked about the resistance between com and v1 with all disconnected and power off to determine if I had a bad psu.


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