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Stepper motors are always energised when on. And have the maximum current draw when idle/fixed.
For it to draw more current, will occur if :
1) The voltage to the motor phases has increased.
2) The phase winding(s) have shorted out (One maybe, but doubt all of them)
3) The resistor to drop the voltage may have shorted out (Some use this method to increase power to stepper motors without increasing the rated voltage of the phases)
I would check the voltages at the phases, or controller. Plus check your supply is correct. Steppers are normally very low voltage, from around 1.5V up to about 7V for common ones.
Theo
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