The DC bus comes from the rectified AC input,I would assume this feature is if you want to use an external DC source instead of the AC mains.
If the drive is powered from an ac source you should measure the resultant dc bus voltage, you should be able to test the drive in a stand-alone condition by enabling it and place a variable DC source into the command +- , change polarity and the direction should change, I use a battery box with a pot to give me +9 -0- -9v but any DC cell from 1.5 to 9vdc into the command input should produce an output to the motor.
When you test it hooked up to the ICM2900 and command a move, there should be a + or - voltage on the command input.
Most drives have a LED to indicate when the drive is in the enabled state.
Does your drives have the 7 segment status LED that will tell if the drive is enabled?
Al.
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |