I am having trouble wiring a 3 phase motor properly.

The motor is the type with different jumpers to connect to adapt it to different voltages. I have 208V 3-phase power.

Here is the wiring diagram that came with machine:


When I hooked it up for the 220V option, the motor seemed to be running way way faster than it should have and the high pitched whining noise coming from it just seemed unhealthy.

So, I hooked it up for the 440V option, and it seemed to work normally. However, when a serious load is put on the machine (well within the limits of what the machine is supposed to be capable of), the motor bogs down and doesn't have enough power.


I noticed the diagram shows a Delta (triangle) sign above the 440V option, and TWO Deltas above the 220V option. Does anybody know what these symbols mean and does it explain why the motor didn't run normally when jumpered for 220V?

Is there some special way I need to wire the motor up to get it to work properly?

Any help would be greatly appreciated. Thanks!