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 - YASKAWA FSDrive-MV1000 Instructions Manual

Cause
Reverse drive output frequency and speed detection.
When output frequency rises, the sensor detects a
speed decrease.
Adjustment made to PID parameter settings are
insufficient.

◆ Insufficient Starting Torque

Cause
Auto-Tuning has not yet been performed (required for
vector control modes).
The control mode was changed after performing
Auto-Tuning.
Only Stationary Auto-Tuning was performed.
◆ Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection
Braking)
Cause
DC Injection Braking is set too low and the drive
cannot decelerate properly.
The stopping method is set so that the drive coasts to
stop.

◆ Output Frequency is not as High as Frequency Reference

Cause
Frequency reference is set within the range of the
Jump frequency.
Upper limit for the frequency reference has been
exceeded.
Large load triggered Stall Prevention function during
acceleration.

◆ Motor Does Not Restart after Power Loss

Cause
The Run command was not issued again when power
was restored.
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
5.11 Troubleshooting without Fault Display
Possible Solutions
⇒Set PID output for reverse characteristics (b5-09 = 1).
⇒ Make the adjustments by referring to the information on the PID control
parameters (b5- ) in the separate FSDrive-MV1000 Parameter Guide.
Possible Solutions
Perform Auto-Tuning. Refer to
Perform Auto-Tuning again.
Perform Rotational Auto-Tuning.
Possible Solutions
⇒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).
Set b1-03 (Stopping Method Selection) to 0 or 2.
Possible Solutions
⇒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.
⇒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
⇒Reduce the load.
⇒Adjust the Stall Prevention level during acceleration (L3-02).
Possible Solutions
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.
Motor Performance Fine-Tuning on page 110.
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