Question on 6 lead 3 ph. motor

[deadshort52]

I am hooking up a 90HP 230/460 6 lead induction motor. The connection diagram shows a line #1 to 1-7, line #2 to2-8, and line 3 to 3-9. My problem is the motor leads are marked 1,2,3,4,5,6. This motor was hooked up as a part winding start and I will be hooking it up to a AC drive. I need help in ringing out the motor leads because I dont know that I can trust the current markings on the wires. Thanks in advance.

 

[erickench]

I think the reason that they have two terminals for each line is because the motor could be wired for either 230 or 460 volts. One terminal would be for a specific voltage I believe. I'm not sure.

 

[cadpoint]

Google, Image, "diagram 6 lead 3 phase motor" here

I like the first diagram (gif) as your answer, but more us to seeing the motors plate like the third one.

 

[cadpoint]

Having re-thought about it since you don't have 9 terminals your connection might be 1,2,3 Line Side with fuses across 4,5,6, Load Side.

Most like the diagrams of Forth and Sixth

 

[david luchini]

This doesn't sound like a 6 lead motor, it sound like a 9 lead motor. Typically a dual-voltage, 6 lead motor is connected as delta for low voltage and as wye for high voltage. That is, for low voltage you'd connect 1&6, 2&4 and 3&5 and for hi voltage you'd connect 1, 2, 3 and tie 4-5-6 together. However, this type of motor would provide a 1.732 ratio from hi-to-low voltage. You indicate a 2:1 voltage ratio.

A nine lead motor typically has the same 6 leads as above, but has another three leads from another set of winding that has an internal wye connection. For low voltage you'd connect 1&7, 2&8, 3&9 and tie 4-5-6 together. This would connect the two sets of winding in parallel in a wye configuration.

For high voltage, the 9 lead motor is connected as 1, 2, 3 and you join 4&7, 5&8, 6&9. This connects the two sets of windings in a series connection in a wye configuration. The 9 lead dual voltage motor has a 2:1 voltage ratio. It would appear from your description: a 2:1 ratio, connecting 1&7, etc, that you have a 9 lead motor.

 

[GeorgeB]

I am hooking up a 90HP 230/460 6 lead induction motor. The connection diagram shows a line #1 to 1-7, line #2 to2-8, and line 3 to 3-9. My problem is the motor leads are marked 1,2,3,4,5,6. This motor was hooked up as a part winding start and I will be hooking it up to a AC drive. I need help in ringing out the motor leads because I don't know that I can trust the current markings on the wires. Thanks in advance.

I'm with the others who've commented. All of the dual (2:1) voltage motors I've worked with have been either 9 or 12 lead. All of the 6 lead have been for start control, most commonly wye-delta.

Can you give some more specifics? Otherwise, I'm stumped.