Discover our Clipsal Smart Home packages as seen on The Block 2018

in location

OR

I'm looking for

  • Wholesalers
    • Uncheck All Check All
  • EXPERTISE
    • Expand
    • Expand
    • Expand
    • Uncheck All Check All
  • Switchboard Manufacturers
    • Uncheck All Check All
OR

The best way to see what Clipsal electric products can do for your home is seeing them in action at a Clipsal Display Centre.

Product stock may vary according to location. If you're after a specific product range, please check with your chosen location before visiting.

10 Results
    Load More Load Complete
    Change Location

    What could be a cause of an overbraking fault (ObF) on the slave ATV71 when in a master-slave configuration?

    Issue:
    Overbraking fault

    Product Line:
    Altivar 71

    Environment:
    All models and serial numbers

    Cause:
    Maximum frequency is set to 72 hertz

    Resolution:
    This can happen if the speed reference of the slave drive does not match the speed reference of the master.   This often indicates the analog output from the Master is fed to the slave but the scaling is not correct.
    Change the maximum frequency (tFr) of the master from 72 hertz (default) to match the High Speed (HSP) setting.  This is usually 60 hertz. 
    The analog output of the drive is scaled from 0 to the maximum frequency parameter when assigned as Motor Freq.  If the maximum frequency is at 72, the analog output will not reach full scale (10 V or 20mA) so the speeds of both drives will not be synchronized.  The slave will run 20% slower than the master.  If the two motors are coupled together (either directly or through the load) the stored energy in the DC bus of the Slave drive could rise above the allowable voltage threshold, causing an overbraking fault.
     

    Didn’t find what you were looking for?

    Try Searching Again View Our Categories

    Need further assistance?

    Our Customer Care department provides total customer service solutions for our residential, industrial and commercial applications.

    Get Assistance