UK Rccb tripping

[zannetos]

Hello,

I have a machine that is only a 3ph motor 4kw with a delta inverter . When i turn off the machine from the plug the rccb (pfim 63/4/003) trips .

What is the problem and what can i do about it. Thank you

 

[pc1966]

Has this just started recently?

A 30mA RCCB might be quite low for a motor inverter drive that probably has quite a lot of filtering for EMC reasons, or it might already be dealing with leakage from other circuits. What does the data sheet for the drive say about leakage currents?

 

[James]

lots of inverters state in the instructions not suitable for rcd supply.
not only can they cause nuisance tripping they can also prevent the rcd from working correctly due to dc leaking back to supply.

 

[David Prosser]

If it's an ABB inverter they show you what screws to remove to prevent this happening on the website.