Troubleshooting66.10 Troubleshooting without Fault DisplayYASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual 3236.10 Troubleshooting without Fault DisplayIf the drive or motor operates abnormally but a fault code or error code is not displayed on the keypad, refer tothis section and take appropriate measures.• Motor hunting and oscillation• Poor motor torque• Poor speed precision• Poor motor torque and speed response• Motor noise◆ Cannot Change Parameter SettingsCause Possible SolutionThe drive is running the motor. (The drive is in DriveMode.)Stop the drive and switch over to Programming Mode.A1-01 = 0 [Access Level Selection = Operation Only] hasbeen set.Set A1-01 = 2 [Access Level Selection = Advanced Level].H1-xx = 1B [MFDI Function Select = Program Lockout]has been set.Turn on the terminals to which H1-xx = 1B has been assigned, and thenchange the parameters.Note:When terminals to which H1-xx = 1B has been assigned have beenturned off, the parameters cannot be changed.The wrong password was entered. • Enter the password to A1-04 [Password] again.• If the password has been forgotten, set the password again using A1-04and A1-05 [Password Setting].Note:If the password has been set, the following parameters cannot bechanged unless the password matches:• A1-01 [Access Level Selection]• A1-02 [Control Method Selection]• A1-03 [Initialize Parameters]• A1-06 [Application Preset]• A1-07 [DriveWorksEZ Function Selection]• A2-01 to A2-32 [User Parameters 1 to 32]Uv [Undervoltage] has been detected. • Check the power supply voltage using U1-07 [DC Bus Voltage].• Check the main circuit wiring.◆ Motor Does Not Rotate After Entering Run CommandCause Possible SolutionThe drive is not in Drive Mode. 1. Check whether [Rdy] is displayed on the keypad.2. If [Rdy] is not displayed, return to the Home screen.was pressed while the drive was stopped, so the Runcommand source switched to the keypad.Perform one of the following operations:• Press .• Restart the drive.Note:Switching the Run command source using can be disabled bysetting o2-01 = 0 [LO/RE Key Function Selection = Disabled].Auto-Tuning has just completed. Switch the keypad to the Home screen.Note:When Auto-Tuning completes, the drive is switched back to theProgramming Mode. The Run command will not be accepted unless thedrive is in the Drive Mode.The fast stop command has been entered. Turn off the fast stop input signal.Settings are incorrect for the source that provides the Runcommand. Set b1-02 [Run Command Selection 1] correctly.The frequency reference source is not set correctly. Set b1-01 [Frequency Reference Selection 1] correctly.
