YASKAWA FSDrive-MV1000 Series - Insufficient Starting Torque; Motor Rotates after the Drive Output Is Shut off (Motor Rotates During DC Injection Braking); Output Frequency Is Not as High as Frequency Reference; Motor Does Not Restart after Power Loss

5.11 Troubleshooting without Fault Display
188 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
u Insufficient Starting Torque
u Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection
Braking)
u Output Frequency is not as High as Frequency Reference
u Motor Does Not Restart after Power Loss
Cause Possible Solutions
Auto-Tuning has not yet been performed (required for
vector control modes).
Perform Auto-Tuning. Refer to Motor Performance Fine-Tuning on page 140 for
details.
The control mode was changed after performing
Auto-Tuning.
Perform Auto-Tuning again.
Only Stationary Auto-Tuning was performed. Perform Rotational Auto-Tuning.
Cause Possible Solutions
DC Injection Braking is set too low and the drive cannot
decelerate properly.
• Adjust the DC Injection braking settings.
• Increase the current level for DC Injection Braking (b2-02).
• Increase the DC Injection Braking time at stop (b2-04).
The stopping method is set so that the drive coasts to
stop.
Set b1-03 (Stopping Method Selection) to 0 or 2.
Cause Possible Solutions
Frequency reference is set within the range of the Jump
frequency.
• Adjust the parameters used for the Jump frequency function (d3-01, d3-02, d3-03,
d3-04).
• Enabling the Jump frequency prevents the drive from outputting the frequencies
specified in the Jump range.
Upper limit for the frequency reference has been
exceeded.
• Set the maximum output frequency and the upper limit for the frequency reference to
more appropriate values (E1-04, d2-01).
• The following calculation yields the upper value for the output frequency:
E1-04 × d2-01 / 100
Large load triggered Stall Prevention function during
acceleration.
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
Cause Possible Solutions
The Run command was not reissued again when power
was restored.
Check the sequence and wiring that has been set up to enter the Run command.
Set up a relay should to ensure the Run command remains enabled throughout any
power loss.