Each motor has a tag with a FLA (full load amps) tag. If the tag is missing, and you know the HP, you can use a FLA chart to find the amp rating. Be sure to read the right FLA for the voltage, I assume you are running 208/240 volt. That will be the higher of the 2 numbers on the tag. The lower number will be for 480 volt.
Once the machine is up and running, check the amp draw of each motor by clamping the amprobe around each lead, one at a time. The amp draw must not exceed the rating on the tag. That is the max amps that motor can draw without overheating.
Also check the voltage across the lines at each motor. It should be close to equal. If any pair read lower by about 10 volts or so, there is a bad connection, an imbalance in the panel or incoming voltage. Low voltage or imbalanced voltage will cause higher amp draw. Remember, check it under running load.
If the voltages are good, and the motor is drawing equally high amps on all 3 lines, the motor is overloaded. Either there is something binding or the motor is too small. Continued running that way will overheat and damage the motor.
If voltages are good and the amp draw is dramatically different across the lines, there is a problem with the motor windings.
Be sure each motor is wired for the proper voltage.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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