Jump to content


Photo

Armature Overvoltage


  • Please log in to reply
5 replies to this topic

#1 ram14375

ram14375

    Member

  • Full Member
  • PipPipPipPip
  • 61 posts

Posted 09 October 2008 - 05:19 PM

hello everybody
what could be the reasons for drive tripping with armature overvoltage whil running .
regards
ram

#2 marke

marke

    Posting Freak

  • Moderator
  • PipPipPipPipPipPip
  • 2,603 posts
  • Gender:Male
  • Location:Christchurch, New Zealand

Posted 09 October 2008 - 05:49 PM

Hello Ram

Over voltage is generally due to an "overhauling" load. i.e. the load is driving the motor rather than the motor driving the load.
This must be a single quadrant drive?? A four quadrant drive would dump the excess back into the supply.

Best regards,
Mark.

#3 ram14375

ram14375

    Member

  • Full Member
  • PipPipPipPip
  • 61 posts

Posted 12 October 2008 - 04:25 AM

dear Marke
Thanks for your inputs

Yes this is a single quadrant dc drive used as sepol drive in our cement mill application
how this can be avoided
the drive is of abb make dcs 501
regards
ram

#4 marke

marke

    Posting Freak

  • Moderator
  • PipPipPipPipPipPip
  • 2,603 posts
  • Gender:Male
  • Location:Christchurch, New Zealand

Posted 17 October 2008 - 06:45 AM

Hi ram

Using a four quadrant drive will overcome this.
Some drives allow you to add "braking" resistors that will absorb the extra energy.

Best regards,
Mark.

#5 AB2005

AB2005

    Senior Member

  • Full Member
  • PipPipPipPipPip
  • 406 posts

Posted 18 October 2008 - 10:06 AM

Or you can make some changing in your wiring as when the load drives the armature, it may isolate from drive. It depends upon your application and number of starts and stops/hour.
"Don't assume any thing, always check/ask and clear yourself".

#6 gerryroxas

gerryroxas

    Intermediate Member

  • Full Member
  • PipPipPip
  • 12 posts

Posted 23 October 2008 - 05:58 AM

Hi,

You may check the voltage feedback circuit, it may not sending the proportional feedback to the drive.Feedback circuit maybe derived from encoder, tacho generator or Armature voltage divider circuit, you may try to check also the voltage feedback "IR compensation circuit" (if fitted).

Most of our experience with over voltage fault is due to lost of voltage/speed feedback, voltage unstability maybe due to mechanical reason as well, i.e loose shaft coupling keys to encoder or tachogenerator.

Regards,

Gerry




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users