... fan dispels the heat, to make the module run reliably for a long time.Half current automatically: if control machine not ... half second, driver enter half current state of automatically for electricity saving, the phase current of the winding of the electricThe fault ... the wiring of electrical machinery is a mistake CW5045 2-phase Stepper motor driver, Stepping motor driver,1.5A~4.5A, 24Vdc~48Vdc