ı must to drive " 30:1 Metal Gearmotor 37Dx68L mm with 64 CPR Encoder-PL2823 Dc Motor " using by " motor driver VNH5019" I connected as a photo dawn. but ı could not use pwm control. and some tımes motor run and sometımes does not run. and some times red led open and some tımes green led open. what are these leds mean? ı am so glad ıf you can help me. Best regards.