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ISO5500 Isolation requirements

Tiziano DePaoli
Prodigy 180 points

Hi.

The customer is working to certify the own equipment (industrial robot) in the TUV laboratories. Six ISO5500 are used to drive a three phases output stage with 300V DC bus. The TUV is going to use the european VDE standards. The VDE requirements want a "Reinforced" isolation while the ISO5500 has just the "Basic" isolation with  6kV transient overvoltage level. It's not enought! I'm going to suggest to add a ISO723x in front of ISO5500 in order to increase the transient overvoltage level up to 10kV and so satisfy the "Reiforced" requirement. Is it a good option or you have a better one?

Reading the DS, I see 600V VCE while the ISO5500 first release was 1200V!!! What is this down grade due?

Thanks in advance for yor answer.  

 

  • TI__Genius 14015 points

    Hi Tiziano,

    I don't think you can just add the surge ratings of 6kV and 4kV to get up to 10kV. I will check with VDE to see if that is possible though, and let you know.

    With respect to the working voltage change, it has to do with the silicon process used for the device. The process was originally rated for higher and was then downgraded to 425Vrms at 50 years, so that is the maximum we can guarantee.

    Thanks,
    Jason