Motors are not moving (randomly)

[mstfldmr]

Hi,

we have a strange problem which we could not diagnose properly.

• We tested all our motors and Victor drivers one by one. They were all running.
• We created a simple program which only creates PWM outputs. I checked all ports with a multimeter, and they are fine too.
• I double checked that there is 12V power on the left side of Victors, and their yellow LEDs are flashing.

However, when we connect the PWM outputs to 2 Victors, only one of the motors turns. After formatting CRIO and downloading the program again a few times, that motor stops still and the other one turns. The LED of the moving Victor is constantly on, while the non-moving is still flashing. Swapping the PWM ports does not change the moving motor.

Yeah, I know it's strange but I thought there are many experienced people here and someone could suggest a solution.

thanks...