Generator Frequency Meters
Generator Frequency Meters
(OP)
Maybe some of you generator experts can shed some light on a problem we have with our generator. The generator services a small ski hill with 1 chair lift - off grid.
The generator is 480 V, Y and seems to work fine however, we have had problems with keeping a frequency meter operating. We think it's a case of having a meter with the wrong rating. The meter is a Modutec Inc. Cat # R3PB-FRQ-55/120-20 - from what we can gather reading the label it is rated at 55 Hz and 120 Volts. It aslo has a rating of 800 Volts to ground. It looks like there is a large resistor or Inductor attached to the meter also ( not familiar with the workings of a freq. meter). My question is can w3e use a meter with this rating on a 480 volt Y generator? Thanks in advance for your input.
The generator is 480 V, Y and seems to work fine however, we have had problems with keeping a frequency meter operating. We think it's a case of having a meter with the wrong rating. The meter is a Modutec Inc. Cat # R3PB-FRQ-55/120-20 - from what we can gather reading the label it is rated at 55 Hz and 120 Volts. It aslo has a rating of 800 Volts to ground. It looks like there is a large resistor or Inductor attached to the meter also ( not familiar with the workings of a freq. meter). My question is can w3e use a meter with this rating on a 480 volt Y generator? Thanks in advance for your input.






RE: Generator Frequency Meters
The rating of 120v applies across the input of the device. If you apply 480 or 480/sqrt(3) volts to the input you will likely draw more current and fry the device.
I am guessing that the 800v is the rating of voltage to ground, NOT voltage applied between terminals.
RE: Generator Frequency Meters
RE: Generator Frequency Meters
In most AC gear in ANSI regions, it is customary to use meters with a 120V {and/or 5-amp} ratings, and install potential/current transformers to scale larger quantities.
RE: Generator Frequency Meters
RE: Generator Frequency Meters
http://www.thomasregister.com
and type Meters: Frequency under Product or Service that will return 58 companies to contact directly regarding your frequency meter service or replacement.
RE: Generator Frequency Meters
Seems that the meter is damaged, try buying the same size
to fit your existing panel and advice the Madutec factory
the supply voltage you will be feeding to the meter,
either L-L (480v) or L-N (277v). Then you will receive
the meter to properly work with.
Good luck. And happy new year.