×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

UPS Auxiliary supply to Intelligent MCC

UPS Auxiliary supply to Intelligent MCC

UPS Auxiliary supply to Intelligent MCC

(OP)
Dear all,

I am involved in the electrical engineering design of a industrial plant for which Intelligent type MCCs are required. My intention is the auxiliary supply to this MCC to be from UPS.
OK, on the other hand I need UPS power for Automation equipment and Instrumentation.
The UPS system shall be redundant as per specs.
The question is: should I install two UPS systems, one for MCC control and another one for ICA loads or could I install a common UPS for all the loads? What is your experience regarding this?

And as a step further, the auxiliary DC load for MV switchgear, should it be taken from independant batteries or could I use the same batteries as for the UPS?

Thanks in advance.

RE: UPS Auxiliary supply to Intelligent MCC

I would not combine the station batteries for the MV switchgear with the UPS.  That would increase the risk of discharging the batteries should the charger fail.  

As for the MCC aux power, if there is a lot of analog instrumentation that might be sensitive to voltage transients or EMI on the supply voltage, I'd keep the instrumentation power separate.  

You might also look into operating the MCC starters on 24 V dc, instead of from a UPS.  


 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources