5.10 Detailed Troubleshooting
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 259
Troubleshooting
5
■ OV Occurs When Starting into a Rotating Load
■ Output Frequency is not as High as Frequency Reference
■ Buzzing Sound from Motor at 2 kHz
■ Unstable Motor Speed when Using PM or IPM
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 one of the multi-function input terminals for an external Speed
Search command (H1- = “61” or “62” during the restart period).
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 through 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 × 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
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.
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.
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