text: <s>[INST] PF 400 output current fluctuations Summary: pf400 output current is fluctuation too muchhoping all you are doing great. here is new the problem, PF 400 3-phase 25Hp drive is having issue. in telephonic discussion with site person he told me that there are total 7 drives out of which 2 drives is having issues. these drives are connected with motor and motor is coupled with load via Belt system. Load is FAN and application is blower. drives are working fine when load is uncoupled with motor. Issue is that during operation current fluctuations can be observed from 15 amps to 45 amps and motor is producing too much noise. I already told them to set basic motor parameters and to increase PWM frequency from 4khz to 6khz but it wasn't making much difference. also compensation mode to set at both(electrical and mechanical) sometimes drive is also faulting at F7. accl dcl time is above 50sec. boost select is at 0.0 no IR, what else can be done to overcome this issue. regards. [/INST] Is this a new installation, or have they been running normally for some time and the problem suddenly cropped up? What is the nameplate data for the motor? What is the exact part number for the PF400 drive? All 7 systems are identical, but 2 do not function correctly. What is different about those 2? Are the belts tensioned in the same manner as the other 5, and tensioned to the same amount? Do the fans spin freely by hand (is there something wrong with the bearings)? Many questions, but they all need to be answered to diagnose this problem. \\n </s>