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Frequently Asked Questions

Power Supply Topic: Proper Wiring Method (Input and Output)

 

FAQ No. FAQ01931

 

Question

What is the proper wiring method to use when wiring the input and output?



Answer

 

We recommend wiring the Power Supply with the following method in order to minimize noise.


Separate the Power Supply's input wiring from its output wiring and twist the wire pairs.


If the input wires are bundled with the output wires or wired too close together, noise will be induced in the output lines.

 

Circuit Diagram

 

 

Use heavy-gauge, short input wires.


The input wires are a source of radiation noise, so use heavy gauge, short input wires.

 

Circuit Diagram

 

 

Do not make loops in the input wiring or output wiring.


If there are loops in the wiring, the Power Supply may become a radiation noise source for other electronic devices and the loops may act as antennae that induce high-frequency noise.

 

Circuit Diagram

 

 

Use a heavy-gauge, short ground wire.


If a long wire is used for grounding, the attenuation capabilities of the Power Supply's internal noise filter will be reduced, so use a heavy-gauge, short ground wire.

 

Circuit Diagram

 

 

Connect a noise filter


Connect a noise filter to the Power Supply's input line if there is a device that produces surges (such as a large magnetic relay) connected to the same AC input line and electronic devices connected to the Power Supply's output are not functioning properly.


Also, we recommend grounding the noise filter; NF with a heavy-gauge, short wire.
 

Circuit Diagram

 

 

Other Power Supply FAQs

 What factors should be considered when selecting a Power Supply?

 Are there models available that support serial operation?

 Is the Power Supply's input side (primary) isolated from the output side (secondary)?