Output Frequency Is Not As High As Frequency Reference; Sound From Motor; Unstable Motor Speed When Using Pm; Motor Does Not Restart After Power Loss - YASKAWA Z1000 User Manual

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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.
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Sound from Motor

Cause
Exceeded 110% of the rated output current of the drive
while operating at low speeds.
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Unstable Motor Speed when Using PM

Cause
Drive is attempting to operate the motor beyond the
speed control range listed in the specifications.
Drive is attempting to operate the motor at 5% or less
of the speed reference value.
Motor hunting occurs.
Hunting occurs at start.
Too much current is flowing through the drive.
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Motor Does Not Restart after Power Loss

Cause
The Run command was not issued again when power
was restored.
The relay that is supposed to maintain the Run
command has been switched off.
YASKAWA TOEP YAIZ1U 03B YASKAWA AC Drive – Z1000 User Manual
• 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 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 x d2-01 / 100
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
• If the output current rises too high at low speeds, the carrier frequency is automatically reduced
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.
Check the speed control range and adjust the speed accordingly.
Use an alternative motor.
Refer to Motor Performance Fine-Tuning on page 194
Increase the S-curve time at the start of acceleration (C2-01).
• Use alternative motor if the drive is attempting to operate the motor at 5% or less of the speed
reference value.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test
report provided for the motor.
• 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.
Check wiring and circuitry for the relay intended to keep the Run command enabled.
5.10 Troubleshooting without Fault Display
Possible Solutions
Possible Solutions
Possible Solutions
for details.
Possible Solutions
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