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Need info concerning M-90 Register and VM-65-S meter
2

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

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

Please do not cross post.

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

Sherry:

Here is links to the technical information and trouble shooting guide for the M90-register:

http://www.geindustrial.com/products/applications/GET-6813.pdf (technical information)
http://www.geindustrial.com/products/manuals/GEI-52551.pdf (trouble shooting guide)

Normally, a multiplying factor is used when you use VTs and CTs with a kWh meter. (multiplying factor = voltage factor x current factor) Your voltage factor will be 8.66, say 9 (4160/480) because you transform the voltage down from 4160V to 480V. I suspect you are also using CTs with a ratio of 32 (288/9) - thus something like 160/5 CTs.

The new numerical kWh-meters/registers do the multiplying factor automatically (you have to program it) but it do not seem as if the M-90 Register can do it if I read through the manual.

Regards
Ralph

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

The red lights are there to let you know that potential is being applied to the meter.  Electromechanical watthour meters measure a certain amount of energy with each revolution of the disk.   If, when the meter was purchased, the manufacturer was told the CT and PT ratio that was to be used, the primary disk constant would be printed on the face to advise how much energy each revolution of the disk represented in the primary circuit.  The gear ratio between the disk and the register would then be selected to provide a reasonable multiplier to be applied to the register reading to obtain the energy consumed over a given time period.  You have a mixture of electromechanical and digital measurement so the M-90 portion of the unit, if programmed correctly, can avoid the use of multipliers and give you some added information beyond that of  the "pointer" register.

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

(OP)
Thank you PWR and RalphChristie for your help. You have been helpful to our site wide power study.
Davidbeach - No help.
Thanks again and if you or anyone else has information that can help, it would be greatly appreciated.
Sherry

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

Maybe not, but if you had only posted it once, you would have all your answers in one place.  It is generally considered rude to post the same question in multiple forums.  Note, I did not red flag either of them, if I had it is likely that at least one would have been unceremoniously deleted.

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