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I am looking for motor data and dimensions on a Yaskawa, Type VBOZN-BY, 75 HP, C2553 frame eddy current motor, manufactured in 1984. Any help would be much appreciated. Internet searches have been fruitless. Bigbillnky,C.E.F.....(Chief Electrical Flunky)

Do these motors have a wound field? If so, the field current could be the cause of the speed variation issue. I would test the field current with the motor running and make sure that it matches the motor nameplate. Typically, diode failure in a controller that has a seperate power supply...

bigheadted I know 120 volts into a DC input card will permanently latch the input. I saw it done TWICE in a row by the same technician. He did not appreciate the humor I found in the situation, but we ALL make mistakes (especially me at times). Bigbillnky,C.E.F.....(Chief Electrical Flunky)

humbleuser The windings of a correctly-connected motor that failed from single-phasing will be easy to spot. If it was wye connected(most likely), two of the three stator windings will be charred. If it was delta connected, only one will be charred. If the motor failed due to an overloaded...

dtoo Is not gasoline dispensing pumps outdoors also? Seek help from a local engineering firm. Bigbillnky,C.E.F.....(Chief Electrical Flunky)

skogsgurra Very interesting post. I especially love the photo of the guys "grounding" the lake. I believe you will find some very interesting things happening in that lake. You do not mention the depth of the lake and the proximity, if known, between the pipes that terminate in the lake...

tulum Goodafternoon, The cheapest and easiest way is to use 2 fixed limit switches, a float ball mounted on a stem, and a ATL starter. The bottom limit switch closes when the float ball raises up due to an increase in level and provides power to the common side of both the top limit and the...

Rodneyjax Goodmorning You would probably find it interesting to know that these machines are still used by companies to test mechanical aptitude. Hard to believe but true. Bigbillnky,C.E.F.....(Chief Electrical Flunky)

EEAOC I admit I did not do the calculations, but 4/0 seems to be way oversized, all things considered. Voltage drops in the NEC are recommendations only, not a requirement. Keep in mind that local codes CAN require compliance with voltage drop limitations. Refer to the AHJ if in doubt. Yes...

arcelectric Morning, Have you tested the capacitor? A resistance check of the windings is not always a good indicator of their internal condition. A winding analyzer is your best bet. Just out of curiosity, what is the nameplate HP, RPM, and voltage? Has this motor been rewound, and...

dave11282 Goodmorning You are questioning whether or not to break the neutral conductor, yet later you refer to the voltage as 240 volt. It is a very rare motor that requires a neutral at 240 volt. Are you sure of the voltage? One other point is that when you install a motor that requires a...

nsbelectrical Goodevening. Maybe I can help answer your specific question. I find no specific article in code that would prohibit an awning over a transformer. Code does require that adequate ventilation is provided to prevent the transformer from exceeding the max temperature rise as stated...

Hello robbm, Unless you need to practice your cursing, I would not recommend THHN. Control cabinets wired with THHN are very difficult to work in. When the wireway covers are removed and the wire disturb, THHN tends to "eject" itself from inside the wireway(and I do mean eject). This leaves the...

vosstire Goodafternoon. I would suggest upgrading the starter to a NEMA rated starter. I have had considerable problems with Moeller in the past, so much so I totally avoid them. In all fairness though, comparing IEC rated equipment to NEMA is a night and day difference. This will more than...

Hello skbutler My suggestion would be to check shaft speed at 60hz(a high quality stroboscope is the best, most reliable means of checking speed that I have found). Compare this reading to motor nameplate speed. It is also best to measure the voltage, current, and frequency readings at the same...

Hello lrob If you have already used an amp clamp to read actual current, this equipment must have already been assembled. Are you attempting to reverse-engineer the protection based on actual amp draws? What are you referring to when you state the "protection" current, and how did you calculate...

Hello klubie jraef is correct in respect to an inspectors jurisdiction concerning existing installations, at least in all the states I have had dealings in. The one thing to bear in mind is the state fire marshall does have the power, if he deems it an imminent danger. Also, in several...

Just a few weeks ago, a man was electrocuted in my home town while trying to save his 11 or 12 year old son. Turns out the son was using wire cutters to remove/steal wire from a school that had been closed several years ago. When the young man started receiving a shock, his father grapped him...

wwsparky, Do you mean you are having drive faults?(instead of failures, which I interpret to require replacement/ repair) If you are having faults, please list the fault type/types and any other info you may have and maybe we can help pinpoint possible problems. Bigbillnky,C.E.F.....(Chief...

This is the main reason I still keep a wiggy handy, even when everyone says they are outdated and useless compared to modern DMM. Ignorance is bliss, I suppose. Bigbillnky,C.E.F.....(Chief Electrical Flunky)