×
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

Need info on M-90 Register and VM-65-S meter

Need info on M-90 Register and VM-65-S meter

Need info on M-90 Register and VM-65-S meter

(OP)
We have a GE M-90 Register being used on a VM-65-S meter to monitor power usage in our Lithium Carbonate mill (4160V power and it is transformed down to 480V for the meter/register). Our billing personnel are taking the numbers from this meter and multiplying them by 288 to get a cumulative Kwh for each month. According to the M-90 Register info, a multiplier doesn't appear to be necessary as it should record Kwh directly along with max KW demand, cumulative KW demand, etc. When asked what this multiplier refers to, no one could come up with an answer. The meter/register is also showing red lights - but nothing in the M-90 refers to warning lights and we haven't been able to find out any information on the meter itself. Is anyone familiar with this type of equipment and do you have any idea what the conversion number and red lights refer to???
Thank you in advance for any help you can provide! Sherry

RE: Need info on M-90 Register and VM-65-S meter

Please do not cross post.

RE: Need info on M-90 Register and VM-65-S meter

The dial multiplier is equal to the reading times the transformer factor, which comprises the potential transformer ratio times the current transformer ratio.  The 288 multiplier figure would be for the potential transformers going from 288 volts to 120volts, for you have a 480/277 volt circuit.  You need to find the three current transformers and read their ratio.  The Kh or watt/hour constant for this meter is 1.8.
Dial multiplier = 1.8xregister ratiox50xtransformer factor/10000.  Hope this helps.

RE: Need info on M-90 Register and VM-65-S meter

Oh I forgot about the lights.  There should be three of them lit, and that is a good thing, for it tells you have all three phases of power coming in.

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