Cause Possible SolutionsInsufficient voltage insulation between motor phases.When the motor cable is long, high voltage surges occur between the motor coils and driveswitching.Normally, surges can reach up to three times the drive input power supply voltage.• Use a motor with a voltage tolerance higher than the max voltage surge.• Use an inverter-duty motor rated for use with AC drives when using the motor on drives ratedhigher than 200 V class.• Install an AC reactor on the output side of the drive. The carrier frequency should be set to 2kHz when installing an AC reactor.The motor fan has stopped or is clogged. Check the motor fan.The carrier frequency is too low. Increase the carrier frequency to lower the current harmonic distortion and lower the motortemperature.u oPE02 Error Occurs When Lowering the Motor Rated Current SettingCause Possible SolutionsMotor rated current and the motor no-load currentsetting in the drive are incorrect.• The user is trying to set the motor rated current in E2-01 to a value lower than the no-loadcurrent set in E2-03.• Make sure that value set in E2-01 is higher than E2-03.• If it is necessary to set E2-01 lower than E2-03, first lower the value set to E2-03, then changethe setting in E2-01 as needed.u Motor Stalls during Acceleration or Acceleration Time is Too LongCause Possible SolutionsTorque limit has been reached or current suppressionkeeps the drive from accelerating. Take the following steps to resolve the problem:• Reduce the load.• Increase motor capacity.Note: Although the drive has a Stall Prevention function and a Torque CompensationLimit function, accelerating too quickly or trying to drive an excessively largeload can exceed the capabilities of the motor.Load is too heavy.Torque limit is not set properly. Check the torque limit setting.Frequency reference is too low.• Check the maximum output frequency (E1-04).• Increase E1-04 if it is set too low.Check U1-01 for proper frequency reference.Check if a frequency reference signal switch has been set to one of the multi-function inputterminals.Check for low gain level set to terminals A1, A2, or A3 (H3-03, H3-11, H3-07).Load is too heavy.• Reduce the load so that the output current remains within the motor rated current.• In extruder and mixer applications, the load will sometimes increase as the temperature drops.• Increase the acceleration time.• Check if the mechanical brake is fully releasing as it should.Acceleration time has been set too long. Check if the acceleration time parameters have been set too long (C1-01, C1-03).Motor characteristics and drive parameter settings areincompatible with one another.• Set the correct V/f pattern so that it matches the characteristics of the motor being used.• Check the V/f pattern set to E1-03.• Execute Rotational Auto-Tuning.Incorrect frequency reference setting.• Check the multi-function analog input settings. Multi-function analog input terminal A1, A2,or A3 is set for frequency gain (H3-02, H3-10, or H3-06 is set to “1”), but there is no voltageor current input provided.• Make sure H3-02, H3-10, and H3-06 are set to the proper values.• See if the analog input value is set to the right value (U1-13 to U1-15).The Stall Prevention level during acceleration anddeceleration set too low.• Check the Stall Prevention level during acceleration (L3-02).• If L3-02 is set too low, acceleration may be taking too long.• Increase L3-02.The Stall Prevention level during run has been set toolow.• Check the Stall Prevention level during run (L3-06).• If L3-06 is set too low, speed will drop as the drive outputs torque.• Increase the setting value.6.10 Troubleshooting without Fault Display332 YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
