YASKAWA CR700

3.11 Problems that Can Frequently Occur during Setup and Possible Solutions
226 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
227
The Correct Auto-Tuning Mode Is Not Available
227
Motor Does Not Operate Correctly Crane Sequence Does Not Operate
227
Motor Does Not Rotate After Entering Run Command
227
The Starting Torque Is Not Sufficient
228
Motor Does Not Restart after Power Loss
228
Motor Rotates in the Opposite Direction from the Run Command
229
Motor Rotates in One Direction Only
229
Motor Stops When Operating at the Brake Release Frequency Speed
229
Response Is Slow at Start
229
Motor Stalls during Acceleration or Accel/Decel Time Is Too Long
229
Output Frequency Is Not As High As Frequency Reference
230
Drive Frequency Reference Differs from the Controller Frequency Reference Command
231
Large Inconsistency in Stopping Position Due to the Load Rate
231
Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled
231
The Motor Rotates after the Drive Output Is Shut Off
231
Suspension Drops or Load Slips Suspension Drops (Falls)
231
Load Slips at Start
232
Load Slips at Stop
232
Slipping Occurs During Extremely Fast Inching
232
Load Falls When Brake Is Applied
232
Too Much Output Current Excessive Current Occurs at Start
232
Excessive Output Current at Constant Speed
233
Too Much Output Current, Oscillation
233
Despite Measures to Increase Flux, Brake Operation Is Slow and Peak Current at Start Take Too Long
233
Excessive Current Flow When Starting to Hoist Immediately After Stopping Lowering
233
Brake Grinding Brake Slips at Start
234
Brake Grinding Occurs at Stop
234