YASKAWA V1000 Series Installation & Start-Up Manual page 259

OV Occurs When Starting into a Rotating Load
■
Cause
The load is already rotating when the
drive is trying to start it.
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.
Buzzing Sound from Motor at 2 kHz
■
Cause
Exceeded 110% of the rated output
current of the drive while operating at
low speeds.
Unstable Motor Speed when Using PM or IPM
■
Cause
The motor code for PM (E5-01) is set
incorrectly. (Yaskawa motors only)
The drive is operating at less than 10% of
the speed reference.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
5.10 Detailed Troubleshooting
Possible Solutions
• 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-
Possible Solutions
• 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.
• 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
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
Possible Solutions
• 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.
Possible Solutions
Set parameter E5-01 in accordance with the motor being used.
Consult with Yaskawa about using a different type of motor when
attempting to operate at 10% of the speed reference.
= "61" or "62" during the restart period).
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