YASKAWA Varispeed G7 Series Instruction Manual page 17

8
9
10
xvi

If the Motor Overheats.................................................................................................. 7-32

If There is Noise When the Inverter is Started or From an AM Radio .......................... 7-33

If the Ground Fault Interrupter Operates When the Inverter is Run ............................. 7-33

If There is Mechanical Oscillation................................................................................. 7-33

If the Torque Generated for the Motor is Insufficient (Insufficient Power)..................... 7-35

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 ................................................ 7-35

If Shock Occurs Near the Speed Estimator Switching Frequency in
Open-loop Vector 2 Control (PRG 102 only) ............................................................. 7-35

If Torque Ripple Occurs at Very Low Speeds in Open-loop Vector 2 Control
(PRG 102 only) ......................................................................................................... 7-36

If the Motor Rotates Even When Inverter Output is Stopped ....................................... 7-36

If OV is Detected When the Fan is Started, or Fan Stalls............................................. 7-36

If Output Frequency Does Not Rise to Frequency Reference ...................................... 7-36

Acoustic Noise From the Motor .................................................................................... 7-37

If Motor Overload (OL1) is Detected Even Though the Current is
below the Motor Rated Current .................................................................................... 7-37
Maintenance and Inspection ..................................................8-1
Maintenance and Inspection ........................................................................ 8-2

Outline of Warranty......................................................................................................... 8-2

Daily Inspection .............................................................................................................. 8-2

Periodic Inspection ......................................................................................................... 8-2

Storage Guidelines ......................................................................................................... 8-3

Periodic Maintenance of Parts ....................................................................................... 8-4

Procedure for Adjusting Constants after Replacement of Control Board ....................... 8-4

Types and Number of Cooling Fans Used in the Drive .................................................. 8-7

Cooling Fan Replacement Outline ................................................................................. 8-8

Circulation Fan Replacement Outline........................................................................... 8-18

Removing and Mounting the Control Circuit Terminal Board ....................................... 8-24
Specifications ..........................................................................9-1
Standard Inverter Specifications................................................................... 9-2

Specifications by Model.................................................................................................. 9-2

Common Specifications.................................................................................................. 9-4
Specifications of Options and Peripheral Devices........................................ 9-6
Appendix ................................................................................10-1
Varispeed G7 Control Methods .................................................................. 10-2

Control Methods and Features..................................................................................... 10-2

Control Methods and Applications................................................................................ 10-4