3.11 Problems that Can Frequently Occur during Setup and Possible Solutions
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YASKAWA
SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
3.11 Problems that Can Frequently Occur during Setup and
Possible Solutions
If the drive or motor operate incorrectly, but the keypad does not show a fault or error code, refer to the items this
section.
•
Motor hunting and oscillation
•
Unsatisfactory motor torque
•
Unsatisfactory speed precision
•
Unsatisfactory motor torque and speed response
•
Motor noise
Note:
If you synchronize two drives or if you use one drive that switches between more than one motor, the method to make adjustments is
different. For these applications, contact Yaskawa about drive settings and drive adjustments.
Table 3.27 Typical Problems
Classification
Problem
Ref.
Keypad Operation
Cannot Change Parameter Settings
The Correct Auto-Tuning Mode Is Not Available
Motor Does Not Operate Correctly
Crane Sequence Does Not Operate
Motor Does Not Rotate After Entering Run Command
The Starting Torque Is Not Sufficient
Motor Does Not Restart after Power Loss
Motor Rotates in the Opposite Direction from the Run Command
Motor Rotates in One Direction Only
Motor Stops When Operating at the Brake Release Frequency Speed
Response Is Slow at Start
Motor Stalls during Acceleration or Accel/Decel Time Is Too Long
Output Frequency Is Not As High As Frequency Reference
Drive Frequency Reference Differs from the Controller Frequency Reference Command
Large Inconsistency in Stopping Position Due to the Load Rate
Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
The Motor Rotates after the Drive Output Is Shut Off
Suspension Drops or Load Slips
Suspension Drops (Falls)
Load Slips at Start
Load Slips at Stop
Slipping Occurs During Extremely Fast Inching
Load Falls When Brake Is Applied
Too Much Output Current
Excessive Current Occurs at Start
Excessive Output Current at Constant Speed
Too Much Output Current, Oscillation
Despite Measures to Increase Flux, Brake Operation Is Slow and Peak Current at Start Take Too Long
Excessive Current Flow When Starting to Hoist Immediately After Stopping Lowering
Brake Grinding
Brake Slips at Start
Brake Grinding Occurs at Stop
Summary of Contents for CR700
Page 1: ......
Page 244: ...3 13 Test Run Checklist 244 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 422: ...7 7 Storage Guidelines 422 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 426: ...8 2 Disposal Instructions 426 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual ...
Page 837: ...EZZ023535 2 35 1 Revision History Revision Revised Content Date First Edition 2017 08 ...
Page 872: ...EZZ023536 2 16 Revision History Revision Revised Content Date First Edition 2017 08 ...