text: <s>[INST] Ultra 3000 hardwire enable I have been wondering if the hardwire enable on the 3000 should be used with the sercos enable command ? If we use the sercos, servo on as the enable command for the drives, should the hardwire enable on the breakout board be used or not or should we leave all control to the sercos loop. I encountered a drive in this condition that would occasionally make a humming sound as it was waiting for a start and when the hardwire enable was removed from drive config and the breakout board this humming went away. There are a few others that do the same thing but I haven't had a chance to get at them. Any knowledge on this condition would be appreciated. [/INST] It is possible to control the enable of the Ultra 3000 SERCOS drive without having to connect 24 volts to the Drive Enable input (pin 31) of the CN1 connector. Using Ultraware, the Digital Input 1 is used for Drive enable. If the input is changed to unassigned, the drive will be enabled on power up. There will be no need for an input to pin 31 to enable the drive.Be aware that, in this case, the motor could start moving on power up. :smileysurprised: - fuzzy logic \\n </s>