YASKAWA FSDrive-MV1000 - 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
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions 157
Troubleshooting
5
◆ 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
Reverse drive output frequency and speed detection.
When output frequency rises, the sensor detects a
speed decrease.
⇒Set PID output for reverse characteristics (b5-09 = 1).
Adjustment made to PID parameter settings are
insufficient.
⇒ Make the adjustments by referring to the information on the PID control
parameters (b5-) in the separate FSDrive-MV1000 Parameter Guide.
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 110.
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).
Note: 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).
Note: The following calculation yields the upper value for the output
frequency = E1-04 x 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 issued again when power
was restored.
Check the sequence and wiring that has been set up to enter the Run command.
⇒A relay should be set up to make sure the Run command remains enabled
throughout any power loss.
Cause Possible Solutions