YASKAWA U1000 Series - Output Frequency Is Not as High as Frequency Reference

6.10 Troubleshooting without Fault Display
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual 389
Troubleshooting
6
◆ Output Frequency is not as High as Frequency Reference
◆ Buzzing Sound from Motor at 2 kHz
◆ Unstable Motor Speed when Using PM
◆ Motor Does Not Restart after Power Loss
◆ The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals
(Terminals DM+ and DM-)
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 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).
Motor runs at following speed.
b2-01 ≤ Motor speed < E1-09
• Set b1-21 (Start Condition Selection at Closed Loop Vector Control) to 1.
• Set E1-09 (Minimum Output Frequency) to a value lower than the setting for b2-01 (DC Injection Braking Start
Frequency).
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 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.
Cause Possible Solutions
The motor code for the PM motor (E5-01 or T2-02) is set
incorrectly (Yaskawa motors only).
Refer to Motor Performance Fine-Tuning on page 344 for details.
Drive is attempting to operate the motor beyond the speed control
range listed in the specifications.
Check the speed control range and adjust the speed accordingly.
Drive is attempting to operate the motor at 5% or less of the speed
reference value.
Use alternative motor if the drive is attempting to operate the motor at 5% or less of the speed reference value.
Motor hunting occurs. Refer to Motor Performance Fine-Tuning on page 344 for details.
Hunting occurs at start. Increase the S-curve time at the start of acceleration (C2-01).
Too much current is flowing through the drive.
• Enter the correct motor code for the PM motor being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report provided for the
motor.
Cause Possible Solutions
The Run command was not issued again when power was restored.
• 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.
The relay that is supposed to maintain the Run command has been
switched off.
Check wiring and circuitry for the relay intended to keep the Run command enabled.
Cause Possible Solutions
There is faulty wiring in the Safe Disable monitor output terminals.
• Check the wiring for the Safe Disable monitor output terminal.
• Correct wiring mistakes.
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