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ov or Speed Loss Occurs When Starting into a Rotating Load
Cause
Possible Solutions
The load is already rotating when the drive is trying to
start it.
• Stop the motor using DC Injection braking. Restart the motor.
• Increase the value of b2-03 (DC Injection Braking Time at start).
• Enable Speed Search at start (b3-01 = “1”).
• Set a multi-function input terminal for external Speed Search command (H1-
oo
=“61” or “62”
during restart).
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Output Frequency is not as High as Frequency Reference
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).
• Enabling the Jump Frequency prevents the drive from outputting the frequencies specified in
the Jump Frequency 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 x d2-01 /
100
Large load triggered Stall Prevention function during
acceleration.
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
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Buzzing Sound from Motor at 2 kHz
Cause
Possible Solutions
Exceeded 110% of the rated output current of the drive
while operating at low speeds.
• If the output current rises too high at low speeds, the carrier frequency automatically reduces
and causes a whining or buzzing sound.
• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = “0”).
• Disabling the automatic carrier frequency derating increases the chances of an overload fault
(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.
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Unstable Motor Speed when Using PM or IPM
Cause
Possible Solutions
The motor code for PM (E5-01) is set incorrectly.
(Yaskawa motors only)
Set parameter E5-01 in accordance with the motor being used.
The drive is operating at less than 10% of the speed
reference.
Consult with Yaskawa about using a different type of motor when attempting to operate at 10%
of the speed reference.
Motor hunting occurs.
Set and carefully adjust the following parameters in the order listed:
• n8-45 (Speed Feedback Detection Suppression Gain)
• n8-55 (Load Inertia for PM Motors)
• C4-02 (Torque Compensation Primary Delay Time)
Hunting occurs at start.
Increase the S-curve time at the start of acceleration (C2-01).
Too much current is flowing through the drive.
• If using a PM motor, set the correct motor code to E5-01.
• If using a specialized motor, set parameter E5-xx to the correct value according to the Motor
Test Report.
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Motor Does Not Operate When the RUN Button on the Digital Operator is Pressed
Cause
Possible Solutions
The LOCAL/REMOTE mode is not selected properly. Press the LOCAL/REMOTE button to switch. The LO/RE LED should be on for LOCAL mode.
The drive is not in drive mode.
A run command will not be issued. Exit to the drive mode and cycle the run command.
The frequency reference is too low.
• If the frequency reference is set below the frequency set in E1-09 (Minimum Output
Frequency), the drive will not operate.
• Raise the frequency reference to at least the minimum output frequency.
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Motor Does Not Operate When an External Run Command is Input
Cause
Possible Solutions
The LOCAL/REMOTE mode is not selected properly. Press the LOCAL/REMOTE button to switch. The LO/RE LED should be off for REMOTE
mode.
The drive is not in Drive Mode.
A run command will not be issued. Exit to the Drive mode and cycle the run command.
6.9 Troubleshooting without Fault Display
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
307
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Troubleshooting