6.10 Troubleshooting Without Fault Display
396 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
◆ The Starting Torque Is Not Sufficient
Causes Possible Solutions
Auto-Tuning has not been done in vector control method. Do Auto-Tuning.
The control method was changed after doing Auto-Tuning. Do Auto-Tuning again.
Stationary Auto-Tuning for Line-to-Line Resistance was
done.
Do Rotational Auto-Tuning.
◆ The Motor Rotates after the Drive Output Is Shut Off
Causes Possible Solutions
DC Injection Braking is too low and the drive cannot
decelerate correctly.
• Increase the value set in b2-02 [DC Injection Braking Current].
• Increase the value set in b2-04 [DC Inject Braking Time at Stop].
The stopping method makes the drive coast to stop. Set b1-03 = 0 or 2 [Stopping Method Selection = Ramp to Stop, DC
Injection Braking to Stop].
◆ The Output Frequency Is Lower Than the Frequency Reference
Causes Possible Solutions
The frequency reference is in the Jump frequency range. Adjust d3-01 to d3-03 [Jump Frequency 1 to 3] and d3-04 [Jump
Frequency Width].
Note:
Enabling the Jump frequency prevents the drive from outputting the
frequencies specified in the Jump range.
The upper limit for the frequency reference has been
exceeded.
Set E1-04 [Maximum Output Frequency] and d2-01 [Frequency Reference
Upper Limit] to the best values for the application.
Note:
This calculation supplies the upper value for the output frequency:
E1-04 × d2-01 / 100
A large load triggered Stall Prevention function during
acceleration.
• Decrease the load.
• Adjust L3-02 [Stall Prevent Level during Accel].
L3-01 = 3 [Stall Prevent Select duringAccel = ILim Mode]
has been set.
1. Check whether the V/f pattern and motor parameter settings are
appropriate, and set them correctly.
2. If this does not solve the problem, and it is not necessary to limit the
current level of stall during acceleration, adjust L3-02.
3. If this does not solve the problem, set L3-01 = 1 [Enabled].
The motor is rotating at this speed:
b2-01 [DC Injection/Zero SpeedThreshold] ≤ Motor Speed
< E1-09 [Minimum Output Frequency]
• Set b1-21 = 1 [CLV Start Selection = Accept Run command at any
speed].
• Set E1-09 < b2-01.
◆ The Motor Is Making an Audible Noise
Causes Possible Solutions
100% of the rated output current of the drive was exceeded
while operating at low speeds.
• If the sound is coming from the motor, set L8-38 = 0 [Carrier Frequency
Reduction = Disabled].
• If oL2 [Drive Overloaded] occurs frequently after setting L8-38 = 0,
replace the drive with a high-capacity drive.
◆ The Motor Will Not Restart after a Loss of Power
Causes Possible Solutions
The drive did not receive a Run command after applying
power.
• Examine the sequence and wiring that enters the Run command.
• Set up a relay to make sure that the Run command stays enabled during a
loss of power.
For applications that use 3-wire sequence, the momentary
power loss continued for a long time, and the relay that
keeps the Run command has been switched off.
Examine the wiring and circuitry for the relay that keeps the Run command
enabled during the momentary power loss ride-thru time.
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