YASKAWA varispeed G7 CIMR-G7B series

xv
 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
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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
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Fault Detection................................................................................................................7-2
 Alarm Detection ............................................................................................................7-15
 Operation Errors ...........................................................................................................7-19
 Errors During Autotuning .............................................................................................7-21
 Errors when Using the Digital Operator Copy Function................................................7-22
Troubleshooting ..........................................................................................7-24
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If Constant Constants Cannot Be Set ...........................................................................7-24
 If the Motor Does Not Operate......................................................................................7-25
 If the Direction of the Motor Rotation is Reversed ........................................................ 7-28
 If the Motor Does Not Put Out Torque or If Acceleration is Slow ..................................7-28
 If the Motor Operates Higher Than the Reference .......................................................7-28
 If the Slip Compensation Function Has Low Speed Precision......................................7-29
 If There is Low Speed Control Accuracy at High-speed Rotation in Open-loop
Vector Control Method..................................................................................................7-29
 If Motor Deceleration is Slow ........................................................................................7-29
 If the Motor Overheats ..................................................................................................7-30
 If There is Noise When the Inverter is Started or From an AM Radio ..........................7-31
 If the Ground Fault Interrupter Operates When the Inverter is Run..............................7-31
 If There is Mechanical Oscillation .................................................................................7-31
 If the Torque Generated for the Motor is Insufficient (Insufficient Power) .....................7-33
 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 ................................................7-33
 If Shock Occurs Near the Speed Estimator Switching Frequency in Open-loop
Vector 2 Control ............................................................................................................7-33
 If Torque Ripple Occurs at Very Low Speeds in Open-loop Vector 2 Control ............... 7-34
 If the Motor Rotates Even When Inverter Output is Stopped........................................7-34
 If OV is Detected When the Fan is Started, or Fan Stalls ............................................. 7-34
 If Output Frequency Does Not Rise to Frequency Reference ......................................7-34
 Acoustic Noise From the Motor ....................................................................................7-35
8 Maintenance and Inspection.................................................. 8-1
Maintenance and Inspection.........................................................................8-2
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Outline of Warranty .........................................................................................................8-2
 Daily Inspection ..............................................................................................................8-2