Jump to content


Photo

Control Cable Capacitance Compensation


  • Please log in to reply
2 replies to this topic

#1 Ravishanker

Ravishanker

    Junior Member

  • Members
  • PipPip
  • 2 posts
  • Gender:Male
  • Location:india

Posted 14 July 2010 - 09:52 PM

while using the long length control cables . it is observed that the motor is not able to stop by breaking the control ckt by stop push button.
this is happening because the cable capacitance continue to be in parallel with the contact and charging current makes the power contactor On.
how to compensate the cable capacitance.?



#2 marke

marke

    Posting Freak

  • Moderator
  • PipPipPipPipPipPip
  • 2,601 posts
  • Gender:Male
  • Location:Christchurch, New Zealand

Posted 18 July 2010 - 09:17 AM

Hello Ravishanker

Welcome to the forum.

To reduce this problem, you must either increase the current flow by adding additionalresistance across the relay coils, or reduce the voltage to say 24VAC, or change to DC coils at say 24VDC.

Best regards,
Mark.

#3 AB2005

AB2005

    Senior Member

  • Full Member
  • PipPipPipPipPip
  • 406 posts

Posted 09 August 2010 - 10:45 AM

I such cases, my personal experience is to install an indication lamp with load (Incandescent/tungsten lamp) with same voltage and watt. Its resistance is very low in ambient temperature and it has an ability that as apply voltage increases, its resistance also increases which is helpful in overcoming on capacitance.

"Don't assume any thing, always check/ask and clear yourself".




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users