Grounding problems

dhagen

dhagen
I think I have a grounding issue I don t know how to solve. The basic problem the 5v signal from the masso is not triggering the a small relay to turn on and off my router. I am using the spindle CW signal from the masso.

The small 5v relay controls a solid state relay to turn on and off the router.
My main power-supply is 24 volts, I added a secondary 5v USB POWER SUPPLY for running my cooling fans.

When I added the small 5v relay to control the SSR I used the same 5v Power-supply which powers the fans.

When I measure input voltage to the small relay it is 5v between the +v and -v of the small relay.
When I measure the voltage between ground of the masso and the input signal I get 5v when the spindle CW is on.

When I measure the voltage between the relay -V and the signal input I get 0 volts which I think is the reason rely is not being triggered.

So I think the problem is no common ground between the small relay and the masso or the relay is bad.

I am wondering how to fix this . Get a proper 5v power supply, the masso is not chassis ground, not sure how to chassis ground it or the relay, finally would a 24v to 5v step down converter.

So how do I connect this small relay to the masso so the signal triggers the relay or should this work and I have a bad relay? I plan to replace it just in case.
 

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breezy

Arie
Staff member
You need to common all -ve connections of the power supplies that you are using. This establishes a signal reference point. There is no need to connect this reference point to "chassis ground."

Your "earth/chassis ground" common point should connect all your AC powered devices to the building earth.

Regards,

Arie.
 

jmvlps

jmvlps
Hi, Dhagen

May be I can help you to the problems of your earthing & grounding issue. There are many ways to solve this grounding issue and this can be guided by many other people, but here I would like to say that we are at JMV LPS Ltd. We are the manufacturer of an earthing & lightning protection system deice. We also help people to solve the grounding problem, So if you are still locking for then pleas visit our website to get all the necessary quaries.
 
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