Faac c721 shorting power on mains

[Gatehelp]

Hi, I have installed a faac c721 with 4 Photocells and everything we connect the transformer it trips the power in the house. We have tested and we get 250v but cannot understand why it keeps shorting the circuit. The c721 is just sat on driveway can't get around it. Has anyone noticed problems with this before - the transformer could just be a smoke screen it's brand new only a couple of weeks old. Faac have said send it back for testing but that's a nightmare with all the blockwork settled back in. I have the nylon racking off also. Any help would be grateful.

 

[Gatehelp]

It could be a fault with the secondary wiring - can't tell unless you try it without the secondary connected

It could be transformer inrush, can't tell unless we know the size of the transformer.

It could be the transformer's connected incorrectly, can't tell unless we see a photo of the Connections

It could be an internal fault within the transformer, can't tell without the ir readings

A number of people have asked a few leading questions in order to narrow the issue down, without any response without the information we will not be able to help you.

We can all have a multitude of informed guesses as to the issue, but are unable to narrow it down without the questions being answered.

Thank you for the responses. I agree i am out of my depth so will find another electrician my hope of it being a known issue was a load of rubbish but i thank you all for your time it is the first time me using this forum but thank you all for your help

 

[DPG]

Thank you for the responses. I agree i am out of my depth so will find another electrician my hope of it being a known issue was a load of rubbish but i thank you all for your time it is the first time me using this forum but thank you all for your help

Did you pay the electrician for this work? I would get him back and tell him to sort it.

Or did you fit it?

 

[Gatehelp]

Did you pay the electrician for this work? I would get him back and tell him to sort it.

Or did you fit it?

paid an electrician who was qualified with house automation he said he would be back but hasnt come back and cant get hold of him - lesson learnt for me but will find another one and then do the automation part of it myself. Every day is a school day as they say.

 

[marconi]

Please show me a picture of how the brown, black and gray wires of the armoured cable have been connected to the green pe/N/L block bottom left of circuit board.

 

[UNG]

paid an electrician who was qualified with house automation he said he would be back but hasnt come back and cant get hold of him - lesson learnt for me but will find another one and then do the automation part of it myself. Every day is a school day as they say.

Whereabouts in Liverpool are you based, your probably not too far from me

 

[UNG]

Looks like the OP has disappeared on this one

 

[marconi]

Looks like the OP has disappeared on this one

You and I though think we know what is one possible reason for the problem.

 

[DPG]

You and I though think we know what is one possible reason for the problem.

I suspect I think the same.

 

[UNG]

You and I though think we know what is one possible reason for the problem.

He is still lurking

 

[Gatehelp]

He is still lurking

I have another electrician booked in to come and have a look. Thanks all

 

[DPG]

I have another electrician booked in to come and have a look. Thanks all

Let us know how you get on

 

[Gatehelp]

Let us know how you get on

Thanks got there in the end with an electrician and now we have power to the gate ready for automation.

I asked what was wrong and here it is

Live and neutral crossed on the rcd (one connected one side, one connected the other side of the consumer unit)

And mcb too small (6amp should've been more than a 12 amp)

 

[marconi]

Thank you for the update. When I checked the mcb size for the 230V ac supply the FAAC literature said it should be 6A. See para 12 on page 2/13:

https://faac.blob.core.windows.net/...ng-gate-operator/c720-c721-732568-reve-en.pdf

(The foreign language instructions say ‘thermal-magnetic breaker’).

There is a figure of 12A in the technical specification but this refers to current draw at 24V dc to power the motors. See:

https://faac.blob.core.windows.net/web/1/root/c721-brochure1.pdf

 

[DPG]

What MCB did your electrician replace the 6A one with?

 

[Gatehelp]

What MCB did your electrician replace the 6A one with?

With this one -