The digital pluses look like an AC voltage to a FLUKE meter.Īnother important way to test the encoder is by checking the state of each channel. When checking from the encoder supply power common to one of the A+,A-,B+,B- encoder signals on the spindle drive encoder input terminal, you should see approximately 2.8 VAC when turning the spindle at the orientation speed. One simple way to manually test an encoder is by using a FLUKE meter, set it to AC input. With the older Baldor drives, as you rotate the spindle, the drive keypad will display the calculated rpm. With our new Baldor H2 drive, we simply switch the drive into open loop Inverter mode and you can see the encoder RPM calculations changing erratically with the drives diagnostics feature. The best method of testing a Fadal Spindle Motor Encoder is to use an oscilloscope to view the A/B channels. ![]() ![]() Too often the drive is misdiagnosed as being "bad" when it's actually the encoder causing the problem. Another sign is the RPM will not be stable. One sign is that the load meter will usually "peg" or pulsate. Missing encoder pulses will basically confuse the drive and cause vector miscalculations which result in too much current output to the motor. One of the most common problems with a Fadal Spindle Drive running in the Vector mode is caused by the spindle motor encoder. Fadal's, Baldor Accu-coder, Spindle Motor Encoder Test
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