Mitsubishi Electric 800 Series Instruction Manual page 9

5.16.14 Encoder feedback control ............................................................................................................................ 619
5.16.15 Droop control ............................................................................................................................................... 621
5.16.16 Speed smoothing control ............................................................................................................................. 624
6 PROTECTIVE FUNCTIONS
6.1 Inverter fault and alarm indications
6.2 Reset method for the protective functions
6.3 The list of fault displays
6.4 Causes and corrective actions
6.5 Check first when you have a trouble
6.5.1 Motor does not start ..................................................................................................................................... 648
6.5.2 Motor or machine is making abnormal acoustic noise ................................................................................. 650
6.5.3 Inverter generates abnormal noise............................................................................................................... 650
6.5.4 Motor generates heat abnormally................................................................................................................. 651
6.5.5 Motor rotates in the opposite direction ......................................................................................................... 651
6.5.6 Speed greatly differs from the setting........................................................................................................... 651
6.5.7 Acceleration/deceleration is not smooth....................................................................................................... 652
6.5.8 Speed varies during operation ..................................................................................................................... 652
6.5.9 Operation mode is not changed properly ..................................................................................................... 653
6.5.10 Operation panel display is not operating ...................................................................................................... 653
6.5.11 Motor current is too large ............................................................................................................................. 653
6.5.12 Speed does not accelerate........................................................................................................................... 654
6.5.13 Unable to write parameter setting ................................................................................................................ 654
6.5.14 Power lamp is not lit ..................................................................................................................................... 654
7 PRECAUTIONS FOR MAINTENANCE AND
INSPECTION
7.1 Inspection item
7.1.1 Daily inspection ............................................................................................................................................ 656
7.1.2 Periodic inspection ....................................................................................................................................... 656
7.1.3 Daily and periodic inspection........................................................................................................................ 657
7.1.4 Checking the inverter module and the converter module............................................................................. 659
7.1.5 Cleaning ....................................................................................................................................................... 659
7.1.6 Replacement of parts ................................................................................................................................... 660
7.1.7 Removal and reinstallation of the control circuit terminal block.................................................................... 665
7.2 Measurement of main circuit voltages, currents and powers
7.2.1 Measurement of powers............................................................................................................................... 668
7.2.2 Measurement of voltages ............................................................................................................................. 668
7.2.3 Measurement of currents ............................................................................................................................. 668
7.2.4 Measurement of inverter input power factor................................................................................................. 668
7.2.5 Measurement of converter output voltage (across terminals P and N) ........................................................ 668
7.2.6 Measurement of inverter output frequency................................................................................................... 669
7.2.7 Insulation resistance test using megger ....................................................................................................... 669
7.2.8 Pressure test ................................................................................................................................................ 669
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CONTENTS
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