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I bought POWER SUPPLY 3-PHASE, SMOOTHED.

I used previous power supply 1-phase as following condition;

  1. Previous supply spec.: 960W 24V 40A
  2. Input: 1 phase 2 wire
  3. Output: 24V DC / around 20A
  4. Load: Signal power (PLC, panel fault lamp, LOP switch, LOP touch screen power, encoder power, relay power)

Question No.1

  • Is possible to use input power (1 phase 2 wire) instead of 3-phase?

Question No.2

  • If No.1 question possible, how to connect wire?

Question No.3

  • If use 1 phase instead of 3-phase, which problems happen? ( ex) power drop, safety problems etc.)

Question No.4

  • If 1 phase-2 wire can't connect directly, is there other way can possible? like using device before power supply input.

Please answer asap.

Thanks.

Transistor
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JSY
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    The handbook for your PSU should answer these questions. –  May 26 '21 at 14:53
  • JSY - Hi, Questions about how to use a particular product should be addressed to that product's manufacturer or support agents etc. Thanks. – SamGibson May 26 '21 at 17:20
  • JSY - I see that you have now removed the manufacturer and model of your power supply from your question, to try to change this from being classed as a "usage question" (which caused its initial closure). I don't believe that removing those details helps readers here, as your questions 1-3 relate to the behavior of *that* power supply - whose identification you removed. You have not added any details of what information the PS manufacturer gave you, when you contacted them. However I will re-open the question, in case the community wants to answer it. – SamGibson May 27 '21 at 01:34

1 Answers1

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Figure 1. Three-phase rectifier and resultant waveform. Image source: Unattributed.

The power supply you are describing probably uses small smoothing capacitors - if any - because it doesn't need them when running on three phases. The resultant DC from the three-phase bridge never drops to zero and the ripple voltage would be quite acceptable for many industrial applications.

Running the power supply on single phase would present the following problems:

  1. The primary single-phase would have to be fed at the required phase-phase voltage.

  2. The diodes would be stressed as the current is spread over fewer components.

  3. The output would have much higher ripple - possibly very close to half-wave rectified waveform.

  4. It's designed for three-phase, not single.

This answer is based on the PSU being Murr 85957 as listed in the original version of your question.

Transistor
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  • 385