Hello - hope someone can advise please.
I have a recently purchased second hand Myford lathe which has a 3-phase inverter (Siemens Micromaster 410)
Lathe all works fine but regularly trips my RCCB 80A 30mA breaker taking out half of the board - usually when first powering on. The inverter is plugged into my downstairs ring main which has a Crabtree MCB B32 breaker but it is always the RCCB that trips.
A PAT test of the inverter reveals that Ileak is 7.29mA which I understand is over the limit of 5mA and is therefor a fail.
The manual for the inverter says that if a RCD is used it must be an RCD Type B. The downstairs ring is protected by a Crabtree MCB 32A
Lathe works just fine if I power it from my inverter generator (no Ground of course)...
There is an option on the inverter to remove the Y Capacitor link if it is used on an ungrounded supply - but I guess that will have safety issues.
So anyone have any ideas to stop the inverter tripping the mains (I'm guessing the fact that it is also an inductive load doesn't help)
Thanks
Dave
I have a recently purchased second hand Myford lathe which has a 3-phase inverter (Siemens Micromaster 410)
Lathe all works fine but regularly trips my RCCB 80A 30mA breaker taking out half of the board - usually when first powering on. The inverter is plugged into my downstairs ring main which has a Crabtree MCB B32 breaker but it is always the RCCB that trips.
A PAT test of the inverter reveals that Ileak is 7.29mA which I understand is over the limit of 5mA and is therefor a fail.
The manual for the inverter says that if a RCD is used it must be an RCD Type B. The downstairs ring is protected by a Crabtree MCB 32A
Lathe works just fine if I power it from my inverter generator (no Ground of course)...
There is an option on the inverter to remove the Y Capacitor link if it is used on an ungrounded supply - but I guess that will have safety issues.
So anyone have any ideas to stop the inverter tripping the mains (I'm guessing the fact that it is also an inductive load doesn't help)
Thanks
Dave