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.

 

[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 -

 

[DPG]

With this one -

The opener looks like it only takes about 2 Amps.

 

[UNG]

With this one -

I think fitting an RCBO for the gate circuit would have been a better and more prudent option, kitchen socket circuit and a gate circuit on the same RCD could be problematic if the RCD trips, seen it before family go away on holiday and come back to a freezer full of defrosted food because the gate circuit developed a fault