Output Frequency Is Not As High As Frequency Reference - YASKAWA U1000 Series Technical Manual

◆ 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.
Motor runs at following speed.
b2-01 ≤ Motor speed < E1-09
◆ 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
Cause
The motor code for the PM motor (E5-01 or T2-02) is set
incorrectly (Yaskawa motors only).
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.
◆ 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.
◆ The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals
(Terminals DM+ and DM-)
Cause
There is faulty wiring in the Safe Disable monitor output terminals.
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
6.10 Troubleshooting without Fault Display
• 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 × d2-01 / 100
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
• 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).
• 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.
Refer to Motor Performance Fine-Tuning on page 344
Check the speed control range and adjust the speed accordingly.
Use alternative motor if the drive is attempting to operate the motor at 5% or less of the speed reference value.
Refer to Motor Performance Fine-Tuning on page 344
Increase the S-curve time at the start of acceleration (C2-01).
• 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.
• 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.
• Check the wiring for the Safe Disable monitor output terminal.
• Correct wiring mistakes.
Possible Solutions
Possible Solutions
Possible Solutions
for details.
for details.
Possible Solutions
Possible Solutions
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