Connected Machinery Vibrates When Motor Rotates; Pi Output Fault; Motor Rotates After The Drive Output Is Shut Off; Injection Braking) - YASKAWA E1000 Technical Manual

◆ Connected Machinery Vibrates When Motor Rotates

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Unexpected Noise from Connected Machinery
Cause
The carrier frequency is at the resonant frequency of the connected
machinery.
The drive output frequency is the same as the resonant frequency
of the connected machinery.
Note: The drive may have trouble assessing the status of the load due to white noise generated from using Swing PWM (C6-02 = 7 to A).
■
Oscillation or Hunting
Cause
Insufficient tuning.
Gain is too low when using PI control.
The frequency reference is assigned to an external source and the
signal is noisy.
The cable between the drive and motor is too long.

◆ PI Output Fault

Cause
No PI feedback input.
The level of detection and the target value do not correspond with
each other.
Reverse drive output frequency and speed detection. When output
frequency rises, the sensor detects a speed decrease.
Adjustment made to PI parameter settings are insufficient.
◆ Motor Rotates After the Drive Output is Shut Off (Motor Rotates During DC Injection
Braking)
Cause
DC Injection Braking is set too low and the drive cannot decelerate
properly.
The stopping method is set so that the drive coasts to stop.

◆ 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.
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
6.10 Troubleshooting without Fault Display
Adjust the carrier frequency using parameters C6-02 through C6-05.
• Adjust the parameters used for the Jump frequency function (d3-01 through d3-04) to skip the problem-causing
bandwidth.
• Place the motor on a rubber pad to reduce vibration.
Perform Auto-Tuning.
Refer to Motor Performance Fine-Tuning on page
Refer to b5: PI Control on page 145 for details.
• Ensure that noise is not affecting the signal lines.
• Separate main circuit wiring and control circuit wiring.
• Use twisted-pair cables or shielded wiring for the control circuit.
• Increase the analog input time filter constant (H3-13).
• Perform Auto-Tuning.
• Reduce the length of the cable.
• Check the multi-function analog input terminal settings.
• Set multi-function analog input terminal A1, A2, or A3 for PI feedback (H3-02, H3-10, or H3-06 = "B").
• A signal input to the terminal selection for PI feedback is needed.
• Check the connection of the feedback signal.
• Check the various PI-related parameter settings.
• No PI feedback input to the terminal causes the value detected to be 0, causing a PI fault and the drive to operate at
max frequency.
• PI control keeps the difference between target and detection values at 0. Set the input level for the values relative to
one another.
• Use analog input gains H3-03 and H3-11 to adjust PI target and feedback signal scaling.
Set PI output for reverse characteristics (b5-09 = 1).
Refer to b5: PI Control on page 145 for details.
• Adjust the DC Injection braking settings.
• Increase the current level for DC Injection Braking (b2-02).
• Increase the DC Injection Braking time at stop (b2-04).
Set b1-03 (Stopping Method Selection) to 0 or 2.
• 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).
• 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.
Possible Solutions
Possible Solutions
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Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
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