text: <s>[INST] Powerflex 700 AC Drive - Fault 24 - Decel Inhibit Here's the story, We have (3) Powerflex 700 Drives installed in a cooling tower, powering (3) 60hp Fan Motors. 2 of them run fine - 1 we are having a problem with. It has happened in the past, and has either corrected itself (unlikely) or we have done something to correct the problem (undocumented - electrician's fault :) ). It is going into a fault 24 - Decel Inhibit - The drive is not following a commanded deceleration because it is attempting to limit bus voltage. All 3 fans are set up identically - This fault's Actions are as follows: 1. Verify input voltage is within drive specified limits. - Input voltage is fine on all 3 drives. 2. Verify system ground impedance follows proper grounding techniques. - All 3 drives are grounded to the same bus bar. 3. Disable bus regulation and/or add dynamic brake resistor and/or extend deceleration time. Bus Regulation has been disabled. Deceleration time on this drive has been changed from default to 3600 seconds. Haven't done anything with a Dynamic Brake Resistor - don't understand what it is and I don't want it to Brake. I'm not concerned with the deceleration speed of the fan at all... Anyone have any other suggestions???????? Any other questions that need to be asked/answered ???? PS - Drive will run anywhere from 2 minutes to 10 minutes before faulting. [/INST] It is not clear to me what could be the cause... may be a defective part or firmware in that drive... Did you try to swap the motor commanded by this drive connecting it onto another one of the three? Just to check if the problem stays with that drive or moves where that motor is connected... Also, as a try, you may disable the fault annunciation using Parameter 238, to see if your application can be run anyway....(with caution...!) Hope this helps… - fuzzy logic \\n </s>