motor rotation
motor rotation
(OP)
can i determine the motor direction will be before starting it up even iff there is no wire nos on the wires coming out of the motor
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RE: motor rotation
Mechanical rotation and phase sequence are not standardized in ANSI regions.
RE: motor rotation
RE: motor rotation
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=motor+phase+rotation+&btnG=Google+Search
RE: motor rotation
RE: motor rotation
1)If your motor is manufactured as per IEC 60034, then if you provide a power supply having positive phase sequence of R,Y,B to the motor with U,V,W terminals (as per the same alphabatical sequecnce ) then the motor should run CCW (anticlockwise) seen from the non-drive end (IEC 60034-8).
2)If your motor is NEMA rated one then there is no any specified standard direction of rotation related to the terminal markings for polyphase induction motors.
But for all NEMA rated single phase motors,universal motors and all syn. motors the direction of rotation should be CCW seen from the non-driving end when positive sequence is given to 1,2,3.
Regards!
Kiribanda
RE: motor rotation
1. What you do is hook up the 3 phase power to the meter. 2. Press the test button. If it lightd up, mark the leads. If not, reverse two leads.
3. Now connect the test leads to the unpowered motor. Rotate the motor in the direction you desire and press the test button. If it lights up, mark these leads. Otherwise switch a pair.
4. If you pair up the power and motor leads, it will turn in the desired direction when power is applied.
RE: motor rotation
If the above does not work, one may search for the motor direction of rotation on the load side, e.g. an attached pump may have an arrow showing the proper motor direction.
RE: motor rotation
Assuming its a three-phase AC motor we're talking about and you dont have available to you the required instrumentation to determine rotation, the suggestion made by jbartos is probably the most suitable for you. However I would add that it would be wise for you to un-couple the motor from the driven machine, particularly if the driven machine is rotation sensitive eg pumps, chiller compressor etc etc. Running these types of machine in reverse rotation may result in irrepairable damage!
Regards,
GGOSS
RE: motor rotation
RE: motor rotation
The phase meter methods will work but are not fool proof - power leads can get crossed, contactors modified, distrubtion switches rewired and so on during new construction...
Safety is a consideration if your motor or it's load is designed for unidirectional service. Some pumps can be ruined in one start-up if run backwards...
Richard Anderson
GP Mill Camas, WA
RE: motor rotation
In that case our standard practice is to run the motor solo prior to coupling it. During that run you can not only check the direction of rotation, but also check the vibration and no-load current. That provides a little extra info which is useful for two reasons:
1 - may help to identify motor problems early (before effort is expended to align and couple)
2 - if there should be a problem which occurs after coupling and loaded starting, the troubleshooting is simpler because some apsects of motor have been ruled out.
RE: motor rotation
RE: motor rotation
it is a three phase ac induction motor i see there is meters on the market to ascertain motor direction
///Actually, some motor direction of rotation testers are suitable for the single phase, two-phase and three phase motors.
Visit
http://www.multimex.com.mx/560060.pdf
for "Features and Benefits" paragraph\\\