Problem activating relay Mesa 7i76E

Hi BeagleBrainz,and JohnnyCNC I have that connection sheet, I've used it to great success with everything else hence my frustration here.

Mike_Eitel I will give that a go with the resistor and see what I learn.

RodW I will have a look at those RS relays tomorrow and maybe compare what I see from my lab power supply with one of the relays I'm using now.

Thanks for your replies guys.

A normal 24VDC control relay typically draws between 25 and 40 mA
Are you sure you are driving a 24V relay?

The 7I76E outputs will flag an overload if they see a (even very short)
load of greater than 800 mA so I suspect some issue with the relay
or wiring. All 7I76E outputs are tested with a loopback fixture that
loads the outputs with 450 mA.

Also check if it is an AC or DC driven relay, driving AC relays with DC will burn them up very quickly.
And please do not drive big relays directly from Mesa 7i76E.

So....

Some further investigation reveals that the current draw is NOT 340ma but 34ma, I misread the lab power supply but the multi meter set me straight, so that makes the "over current" error even more of a mystery?
I have tried 2 different boards from 2 different sources and I get the same error.

I have a friend who "knows a bit about electronics" (yes I know..... But desperate times call for desperate measures) who is going to have a look at it for me on the weekend.

I've also been given some opto isolated relay boards designed for use with Arduinos:
Opto isolated relay board
They take 12v inputs so I've made a simple voltage divider circuit and have 12v tapped off 24v working using my lab PS as a source, this is activating the relay as expected. Can anyone see a reason I can't use the 7176 output to provide the 24v to the divider circuit in order to step it down to 12v for the relay board?

I just know it's going to be something dumb that I have done, but if this discussion helps someone else in the future then it's a win.

Be you Cane Toad, Cockroach, Mexican or other ?

I'm a Cockroach myself.

The Arduino relay boards just add needless complexity. A simple relay with a diode is better. I have used these relays and socket with good results. They also have an LED in them so you can visually tell when they are activated.

Relay
DIN Socket

I have also used this SSR although a DIN mounted one would be more convenient