AXBB charge pump fault

[CharlieRam]

I think I have some of those diodes lying around from a previous project, I'm all for belt and braces approach I've contacted my local shop regarding the repair so I'll wait for a response.

Just a thought....my machine is in a log cabin at the bottom of the garden connected by an RCD in the house so if I leave anything on in there and then decide not to go back down I just trip the RCD. Would that likely cause an issue? It's just easier than going back down to turn it all off!

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[Doddy]

if I leave anything on in there and then decide not to go back down I just trip the RCD. Would that likely cause an issue? It's just easier than going back down to turn it all off!

I don't see anything wrong with that approach.

[john swift]

The belt and braces approach of adding a diode across the relay coil works for me
( As long as you have it the correct way round )



I would look for a wiring problem that could of shorted the +24V to the AXBB output

As semiconductors fuse faster than expensive fuses thats supposed to protect them
you could try adding a 22 ohm 1/4W resistor in series with the relay coil
( the resistor should only fail if the relay coil is shorted )

The only issue I would expect with tripping the RCD will be corrupting the PC hard drive
If you have not shut the PC down

John

[john swift]

Another diagram to expand on the one in post 39



John

[Ger21]

it seems strange that the software will allow me to choose any output for the charge pump though.

A little late, but just wanted to clarify.

Yes, you can assign the charge pump signal to any output. But the charge pump signal is a PWM signal. Only Port 1 Pin 1 has circuitry to convert the PWM signal to an on/off state. If you assign the charge pump to a different output, you'll just get the PWM signal on that output, which will not switch a relay.

[Doddy]

Of course... you may want to use the PWM charge-pump output to control an existing, external charge-pump.

[john swift]

Hi Gerry

Thank you for the missing detail

that makes sense of the test results when Charlie tried using another output

John