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Type B time delayed rcd

Baldyhugh
Hi


As part of a job I’m currently on I have connected a single phase supply to a Danfoss variable speed inverter drive. I wasn’t aware that this would be part of the job but there you go. Anyway I connected it and powered it up and a few seconds later it tripped the rcd. I informed the installers of the drive incase it was faulty but they said that it’s probably the wrong type of rcd. I researched the spec of the drive which says that I need a type B time delayed rcd. I spoke to Hager technical dept as these are the boards I have used and they said that they only do a 4 pole B type but not time delayed. There is an A type time delayed available which is double pole but they didn’t think that it would work as it doesn’t monitor dc which the B type does. These different types are new to me so would anyone have experience of them to offer some advice?


Thanks
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  • 0
    Out of interest I looked at some installation instructions for one of the product range, not over helpful are they?


    The earth fault protection inside the frequency converter protects only the converter itself against earth faults.

    If fault current protective switches are used they must be tested with the drive with earth fault currents that are possible to arise in fault situations.


    Andy B
Reply
  • 0
    Out of interest I looked at some installation instructions for one of the product range, not over helpful are they?


    The earth fault protection inside the frequency converter protects only the converter itself against earth faults.

    If fault current protective switches are used they must be tested with the drive with earth fault currents that are possible to arise in fault situations.


    Andy B
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