Motor 266V 3PH
- Thread starter Dratek
- Start date
- Status
- Occupation
- Licensed Electrician
That's messed up. The voltage, amps and horse power make no sense. Near the bottom it says usable at 208V so I would guess it's meant to run on 240V or 208V.
What's it for?
What's it for?
It's a construction site crane
The name would make sense, I'll try to call Balder tech support
- Occupation
- Licensed Electrician
What does the name plate of the crane say?
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
There is also Boise Electric Motor Company, http://www.boiseelectricmotor.com/products, which sells Baldor motors among other brands.
Possibly a custom order with a private label. That might explain the odd voltage.
Note that the Catalog Number is blank and the "SPEC" may stand for specification or special order.
Possibly a custom order with a private label. That might explain the odd voltage.
Note that the Catalog Number is blank and the "SPEC" may stand for specification or special order.
Double check with the motor manufacturer that the voltage is not a typo. While zI was working for one if the largest we electrical equipment manufacturers there were very rare occasions where mis printed nameplates slipped through QC and final inspection because of a CV combination of oversights where people just screwed up.
It could have resulted in a simple error on a nameplate drawing where the person responsible BH le for printing the NP just followed the drawing and QC just compared the NP to the incorrectly made drawing.
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
I personally believe there is a clue in that it is a recognized component (the reversed "UR"). Generally it means it is intended to be part of a specific piece of equipment. It is not for general use. You should contact the crane manufacture.
According to my calcs:
Typical Motor Currents
kW Volts pf effy Current
26.11 266 0.840 88.5% 76 A
- Occupation
- Licensed Electrician
It's a NEMA style nameplate but the HP and Voltage don't match any standard ratings I have seen. A 286T is a NEMA frame, the DZ would mean there is something wierd about the motor and there is.
I suspect there is more to the story.
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Nor I. But any custom design can be made if the application requires it.
Tony S
Senior Member
- Location
- Resting under the Major Oak UK
The motor is for crane duty, what is its function? If it’s on a dual pony motor hoist then the 266V could make sense.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
That is my guess. It is an OEM motor made for a specific product, and that can easily be why the strange voltage rating as well. The nameplate is exactly what Baldor nameplates once looked like other then the name at the top, so I would guess Baldor is the manufacturer.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
If you multiply horsepower by 746 to get watts then multiply VA based on volts/amps on the nameplate by the efficiency and power factor on the plate the two results are very close, I doubt it is a plate with errors on it.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
I usually find that when you see an oddball combination of voltages and/or frequencies on a motor nameplate, it generally boils down to some special application, often involving the use of a VFD.
In this case, it might be that this motor was intended to be used at 100Hz output from a VFD fed by a 480V system so they could get full torque at 100Hz without overloading the motor. By designing the motor this way, the V/Hz ratio is 4.433:1, so at 100Hz the motor needs 443V, easily attainable if the drive is fed with 480V.
In this case, it might be that this motor was intended to be used at 100Hz output from a VFD fed by a 480V system so they could get full torque at 100Hz without overloading the motor. By designing the motor this way, the V/Hz ratio is 4.433:1, so at 100Hz the motor needs 443V, easily attainable if the drive is fed with 480V.
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