Table of Contents
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6.2
List of fault or alarm indications .................................................... 233
6.3
Causes and corrective actions....................................................... 234
6.4
Correspondences between digital and actual characters ............ 243
6.5
Check first when you have a trouble.............................................. 244
6.5.1
Motor does not start.................................................................................................................... 244
6.5.2
Motor or machine is making abnormal acoustic noise................................................................ 246
6.5.3
Inverter generates abnormal noise ............................................................................................. 246
6.5.4
Motor generates heat abnormally ............................................................................................... 246
6.5.5
Motor rotates in the opposite direction........................................................................................ 247
6.5.6
Speed greatly differs from the setting ......................................................................................... 247
6.5.7
Acceleration/deceleration is not smooth ..................................................................................... 247
6.5.8
Speed varies during operation.................................................................................................... 248
6.5.9
Operation mode is not changed properly.................................................................................... 248
6.5.10 Operation panel display is not operating .................................................................................... 249
6.5.11 Motor current is too large............................................................................................................ 249
6.5.12 Speed does not accelerate ......................................................................................................... 250
6.5.13 Unable to write parameter setting............................................................................................... 250
7
7.1
Inspection items ............................................................................. 252
7.1.1
Daily inspection........................................................................................................................... 252
7.1.2
Periodic inspection...................................................................................................................... 252
7.1.3
Daily and periodic inspection ...................................................................................................... 253
7.1.4
Display of the life of the inverter parts ........................................................................................ 254
7.1.5
Checking the inverter and converter modules ............................................................................ 254
7.1.6
Cleaning...................................................................................................................................... 255
7.1.7
Replacement of parts.................................................................................................................. 255
7.2
7.2.1
Measurement of powers ............................................................................................................. 261
7.2.2
Measurement of voltages and use of PT .................................................................................... 261
7.2.3
Measurement of currents............................................................................................................ 262
7.2.4
Use of CT and transducer........................................................................................................... 262
7.2.5
Measurement of inverter input power factor ............................................................................... 262
7.2.6
Measurement of converter output voltage (across terminals P/+ and N/-) ................................. 262
7.2.7
Insulation resistance test using megger ..................................................................................... 263
7.2.8
Pressure test............................................................................................................................... 263
8
8.1
Rating .............................................................................................. 266
VI
251
265
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