text: <s>[INST] Powerflex 755 low torque on first run Hi everyone, We have ten 150Hp motors on a lineshaft with one speed master and nine torque slaves. All drives are in FV After power down, the motor torques on the drives are very high and drives fault with over current (I think that's the message) If we accelerate very slowly, we can get the machine up to around 16Hz where something magic happens and the torques drop down to normal Nothing changes on the machine at this point All subsequent runs are fine until power down, then we have the same situation again All drives auto-tuned, but the resulting parameters are incorrect: P621 (slip) 26.5 rpm, but nameplate says 37 rpm P75 (Flux current) 85A, but measured when running OK is 126A Getting the customer to try these parameters to see if the situation improves Anything else we should be looking at? Thanks, Brian [/INST] Hi Brian, you may also try to disable the flux regulator (Parameter 103: Flux Reg Enable for PowerFlex755). The correct settings of the flux current and slip speed are very important to produce torque properly. \\n </s>