xv
Reducing Shock during Elevating Machine Start, Stop, Acceleration,
and Deceleration.........................................................................................................6-176
Confirming Startup Current and Reducing Carrier Frequency....................................6-179
Overvoltage Inhibit Function.......................................................................................6-180
Current Alarm Function ............................................................................6-181
Peak Hold Current Monitoring Function ...................................................6-182
Maintenance Timer Display Function .......................................................6-183
Settings Required to Use Maintenance Timer Display Function.................................6-183
Settings Required After Replacement of Cooling Fan or Electrolytic Capacitor .........6-184
7 Troubleshooting ..................................................................... 7-1
Protective and Diagnostic Functions ............................................................7-2
Fault Detection................................................................................................................7-2
Alarm Detection ............................................................................................................7-15
Operation Errors ...........................................................................................................7-20
Errors During Autotuning .............................................................................................7-22
Errors when Using the Digital Operator Copy Function................................................7-23
Troubleshooting..........................................................................................7-25
If Constant Constants Cannot Be Set ...........................................................................7-25
If the Motor Does Not Operate......................................................................................7-26
If the Direction of the Motor Rotation is Reversed ........................................................7-29
If the Motor Does Not Put Out Torque or If Acceleration is Slow ..................................7-29
If the Motor Operates Higher Than the Reference .......................................................7-29
If the Slip Compensation Function Has Low Speed Precision......................................7-30
If There is Low Speed Control Accuracy at High-speed Rotation in
Open-loop Vector Control Method ................................................................................7-30
If Motor Deceleration is Slow ........................................................................................7-30
If the Motor Overheats ..................................................................................................7-31
If There is Noise When the Inverter is Started or From an AM Radio ..........................7-32
If the Ground Fault Interrupter Operates When the Inverter is Run..............................7-32
If There is Mechanical Oscillation .................................................................................7-32
If the Torque Generated for the Motor is Insufficient (Insufficient Power).....................7-34
If the Torque Reference (U1-09) at Low Speeds in Open-loop Vector 2 Control is
Large Compared to That at Medium and High Speeds ................................................7-34
If Shock Occurs Near the Speed Estimator Switching Frequency in
Open-loop Vector 2 Control (PRG: 102 only) ............................................................7-34
If Torque Ripple Occurs at Very Low Speeds in Open-loop Vector 2 Control
(PRG: 102 only).........................................................................................................7-35
If the Motor Rotates Even When Inverter Output is Stopped........................................7-35
If OV is Detected When the Fan is Started, or Fan Stalls .............................................7-35
If Output Frequency Does Not Rise to Frequency Reference ......................................7-35
Acoustic Noise From the Motor ....................................................................................7-36
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