152 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
5.11 Troubleshooting without Fault Display
5.11 Troubleshooting without Fault Display
When the drive or motor goes wrong even though the fault or error code is not displayed in the digital operator, refer to
this section to take appropriate measures.
When the symptoms below occurred which may result from the control performance, refer to Motor Performance Fine-
Tuning on page 110 in this manual, or to the FSDrive-MV1000 Parameter Guide.
• Motor hunting and oscillation
• Poor motor torque
• Poor speed precision
• Poor motor torque and speed response
• Motor noise
◆ List of Key Phenomena
◆ Cannot Change Parameter Settings
Content of Phenomenon
Reference
Page
Cannot Change Parameter Settings 152
Motor Does Not Rotate Properly after Pressing RUN Button
or after Entering External Run Command
Motor Does Not Rotate 153
Motor Rotates in the Opposite Direction from the Run
Command
154
Motor Rotates in One Direction Only 154
Motor is Too Hot 154
Drive Does Not Allow Selection of Rotational Auto-Tuning 155
Motor Stalls During Acceleration or With Large Loads/Acceleration Time is Too Long 155
Drive Frequency Reference Differs from the Controller Frequency Reference Command 155
Excessive Motor Oscillation and Erratic Rotation 156
Load Falls When Brake is Applied (Hoist-Type Applications) 156
Noise From Drive or Output Lines When the Drive is Powered On 156
Connected Machinery Vibrates When Motor Rotates
Unexpected Noise from Connected Machinery 156
Oscillation or Hunting 156
PID Output Fault 156
Insufficient Starting Torque 157
Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection Braking) 157
Output Frequency is not as High as Frequency Reference 157
Motor Does Not Restart after Power Loss 157
Cause Possible Solutions
The drive is running the motor (i.e., the Run command
is present).
⇒Stop the drive and switch over to the Programming Mode.
Note: Most parameters cannot be edited during run.
The Access Level is set to restrict access to parameter
settings.
Set the Access Level to allow parameters to be edited (A1-01 = 2).
The digital operator is not in the Parameter Setup
Mode (the screen will display “PAr”).
See what mode the digital operator is currently set for.
⇒Parameters cannot be edited when in the Setup Mode (“STUP”). Switch modes
so that “PAr” appears on the screen. Refer to The Drive and Programming Modes
on page 83.
A sequence input terminal is set to allow parameter
editing (H1-01 through H1-13 = 1B).
When the terminal is open, parameters cannot be edited.
⇒Turn on the sequence input terminal set to 1B and then set the parameter.
The wrong password was entered.
If the password entered to A1-04 does not match the password saved to A1-05, then
drive settings cannot be changed.
⇒Reset the password.
Note: If you cannot remember the password:
Scroll to A1-04. Press the button and press at the same time.
Parameter A1-05 will appear.
Set a new password to parameter A1-05.
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