6.9 Troubleshooting without Fault DisplayThis section describes troubleshooting problems that do not trip an alarm or fault.The following symptoms indicate that the drive is not set correctly for proper performance with the motor. Refer to MotorPerformance Fine-Tuning on page 224 for guidance on troubleshooting.• Motor hunting and oscillation• Poor motor torque• Poor speed precision• Poor motor torque and speed response• Motor noiseu Common ProblemsCommon Problems PageCannot Change Parameter Settings 258Motor Does Not Rotate Properly after Pressing the AUTOButton or after Entering External Run CommandMotor Does Not Rotate 259Motor Rotates in the Opposite Direction from the RunCommand 260Motor Rotates in One Direction Only 260Motor is Too Hot 260oPE02 Error Occurs When Lowering the Motor Rated Current Setting 261Motor Stalls During Acceleration or With Large Loads 261Drive Frequency Reference Differs from the Controller Frequency Reference Command 261Excessive Motor Oscillation and Erratic Rotation 262Deceleration Takes Longer Than Expected 262Noise From Drive or Motor Cables When the Drive is Powered On 262Ground Fault Circuit Interrupter (GFCI) Trips During Run 262Connected Machinery Vibrates When Motor Rotates Unexpected Noise from Connected Machinery 262Oscillation or Hunting 263PI Output Fault 263Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking) 263Output Frequency is not as High as Frequency Reference 263Sound from Motor 263Motor Does Not Restart after Power Loss 264u Cannot Change Parameter SettingsCause Possible SolutionsThe drive is running the motor(i.e., the Run command is present).• Stop the drive and switch over to the Programming Mode.• Most parameters cannot be edited during run.The operator is not in the Parameter Setup Mode(the screen will display “PAr”).• See what mode the operator is currently set for.• Parameters cannot be edited when in the Setup Mode (“STUP”). Switch modes so that “PAr”appears on the screen. Refer to The Drive and Programming Modes on page 99.A multi-function contact input terminal is set to allowor restrict parameter editing(H1-01 through H1-07 = 1B).• When the terminal is open, parameters cannot be edited.• Turn on the multi-function contact input set to 1B.The wrong password was entered.• If the password entered to A1-04 does not match the password saved to A1-05, then drivesettings cannot be changed.• Reset the password.If you cannot remember the password:• Scroll to Z1-02. Press OFF and simultaneously. Parameter Z1-03 will appear.• Set a new password to parameter Z1-03.6.9 Troubleshooting without Fault Display258 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
