3 Phase motor getting hot.
3 Phase motor getting hot.
(OP)
I just replaced same type of motor, same serial #, RPM, HP, everything the same. I got this motor from the manufacture.Before I diconnect the wires, I even wrote down the connections as low voltage connections.I connected the same wire connections on this new motor. It runs for about 15-20 min and it's getting hot. Nothing tripping, no blown fuses. I checked the voltages, all 3 wires has the about the same 205vac. This is very unsual to me.
I called the manufacture and asked them about this, and they said as long as the motor is not over amprage the motor is fine. I even asked the technical, why it didn't get that hot with the old motor with the same connections. They said these motors suposely will get warm. Again, as long as they don't get over amprage is okay.
Any experts here can help me about this issue. The motor runs about 12 hrs a day. I don't want it to be burnt. I was thinking to re-connect the wires to high voltage connections, but the input voltage is 208 @ the control panel. I'm afraid it will blow something if I connect high voltage. Is it okay for me just to test the high voltage to see if the hot goes away? Please help. Thanks in advance.
Regards,
ECEG





RE: 3 Phase motor getting hot.
If you can hold your hand on it, it's probably OK. Motors can get pretty hot if fully loaded.
It would be helpful to know the motor horsepower, nameplate current, and rpm.
David Castor
www.cvoes.com
RE: 3 Phase motor getting hot.
There could possibly be other reasons for motor to run hot related to changeout process.... perhaps misalignment, miswiring. Perhaps if you give more details we can guess (hot hot is it, how much current, is it balanced, vibration, etc). But my gut is you are overreacting to the temperature.
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RE: 3 Phase motor getting hot.
RE: 3 Phase motor getting hot.
eceg - Post the nameplate details of both the motors and the motor current now.
Muthu
www.edison.co.in
RE: 3 Phase motor getting hot.
My comments are not very relevant.... Just thought I would rant a little. I wouldn't presume to speculate explanations for the OP's s/n.
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: 3 Phase motor getting hot.
A Class F motor is 15 degrees C hotter than Class B and the Class H is hotter yet.
My guess is the motor's OK. Check the amps to be sure.
RE: 3 Phase motor getting hot.
You have to be able to count to 10 really fast!
An electrician once told me that if you can't count to 10, try 5!!
David Castor
www.cvoes.com
RE: 3 Phase motor getting hot.
Rafiq Bulsara
http://www.srengineersct.com
RE: 3 Phase motor getting hot.
It's GUSHER pump.
Model : 11201-XLONG
Serial : 1203-260
Volts: 230-460
AMP: 1.6 - 8
HP: 1/2
RPM: 3450
CY: 60
Ref: 34G61 - 3229S2
IMP 2281 - B
I just checked the amprage of the wires using clamp on. They are about 0.8 to 1.4 amps. Are they too low? The motor is locked tight, no vibrations. I can feel it's running smooth.
I may have to rebuild the the old pump and put it back, but it looks very rusty & nasty. If I have no other choice, I would have to sandblast, rebuild, and repaint ...Sigh.
All these might properly cost more than a new pump. Not to mention the time spent. I hate to get another new pump...and I end up having the same problem. :(
Anymore ideas guys. Thanks
RE: 3 Phase motor getting hot.
There is a problem if either of these are true. You have measured the current with some type of accurate current measuring device and have found the current is above the motor rated current. You have measured the temperature of the motor with some type of accurate temperature measuring device and have found the motor is running above it's rated temperature.
RE: 3 Phase motor getting hot.
David Castor
www.cvoes.com