text: <s>[INST] PWM ? So, here is the set up - Old Drive : 1336 Plus II200 HPInstalled, and ran fine for about 7 years. Old Drive Failed for unknown reason. Replaced with New Drive - Powerflex 700 - 200hp Heavy Duty Motor Cable Length - less than 100 ft maybe even closer to 50 ft We are not able to keep the Powerflex running for any longer than 9 months, sometimes shorter. the drive will have a major failure in the output section. Smoke released very big boom. This has happened 3 times. Side note - some questions as to if the cabinet is big enough, and if the air flow is proper but for this question this assume that is not an issue. My question : Is it possible that the PWM Frequency is causing issues in the old motor cables ( Still have the original cables from the 1336 Plus II ) that is someone getting back into the drive. I know this sounds far-fetched...but is it possible...and I know anything is possible but... My point being..could this be an issue if the old cables are not replaced And they are 9+ years old now. Thanks I look forward to all feedback [/INST] Hi there, I have a couple quetions regarding the set up. Is the system grounded or not? If the system is not grounded and the ground jumpers are not removed that could cause you some issues. Has the motor been replaced? If it is still the original motor, perhaps that is why the 1336 failled. From the information posted it seems like some sort of short back into the drive. It could be related to the cables, but I'm wondering if there is some outside factor feeding back into the drive. Regen feedback or something of the such. Have a good one. \\n </s>