GENERAL - STEPPER MOTOR FAULT.

Stepper's with eight leads can be wired in Series or Parallel. If it is miswired, a motor fault will result.

Here is one example...

		
		Eight leads:

		
		A+	A+ lead

		
		Act+	A+ center tap

		
		Act-	A- center tap

		
		A-	A- lead

		
		

		
		B+	B+ lead

		
		Bct+	B+ center tap

		
		Bct-	B- center tap

		
		B-	B- lead

		
		

When wired correctly in Series, each of the leads will go to the appropriate pins on the motor connector of the drive. The A+ and A- center taps will be connected to each other. So will the B+ and B- center taps be connected to each other.

If one of the phases has a center tap and its corresponding lead swapped, a motor fault can occur. For example, if A+ and Act+ are swapped, the motor's phase will still measure correctly when you measure the resistance from A+ to A-. However, the drive does not like this.