text: <s>[INST] Main Contactor Fault F10 Powerflex DC I inherited a machine that has a couple of powerflex DC drives on it, I love them, but I keep having a problem, I keep getting fault F 10, Main Contactor, I have been in the manual and everything seems fine, I also updated my firmware in the drives. My question is do I even need the contactor on the output side of the drive, in the manual I see where you can set parameter 1391 {control contactor} to none. I am not using dynamic braking. Also when my estop circuit is tripped I am loosing the enable to the drive, so I do not see why I have to use an external contactor. [/INST] Hi, if you don't use a Contactor (param. 1391 set to NONE) then check the following. When a contactor is NOT used: 1. Set parameter 1391 [ContactorControl] to “None”2. Do NOT set either [Relay Out x Sel] parameter to “Contactor” or ContactorDB” 3. Do NOT set any [Digital Inx Sel] parameter to “Contactor” Param. 140 (Digital In 8) is configured to Contactor by default :smileysurprised: Hope this helps… - fuzzy logic \\n </s>