Connected Machinery Vibrates When Motor Rotates - YASKAWA U1000 Series Technical Manual

6.10 Troubleshooting without Fault Display

◆ Connected Machinery Vibrates When Motor Rotates

■ 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: To inspect for a motor error, set C6-02 to a value between 1 and 4 and check the motor.
Oscillation or Hunting
■
Cause
Insufficient tuning.
Gain is too low when using PID 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.
◆ PID Output Fault
Cause
No PID 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 PID parameter settings are insufficient.
◆ Insufficient Starting Torque
Cause
Auto-Tuning has not yet been performed (required for vector
control modes).
The control mode was changed after performing Auto-Tuning.
Only Stationary Auto-Tuning was performed.
◆ 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.
388
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: PID Control on page 201
• 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 filter time 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 PID feedback (H3-02, H3-10, or H3-06 = "B").
• A signal input to the terminal selection for PID feedback is needed.
• Check the connection of the feedback signal.
• Check the various PID-related parameter settings.
• No PID feedback input to the terminal causes the value detected to be 0, causing a PID fault and the drive to operate
at max frequency.
• PID 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 PID target and feedback signal scaling.
Set PID output for reverse characteristics (b5-09 = 1).
Refer to b5: PID Control on page 201
Perform Auto-Tuning. Refer to Motor Performance Fine-Tuning on page
Perform Auto-Tuning again.
Perform Rotational Auto-Tuning.
• Adjust the DC Injection braking settings.
• Increase the current level for DC Injection Braking Current (b2-02).
• Increase the DC Injection Braking time at stop (b2-04).
Set b1-03 (Stopping Method Selection) to 0 or 2.
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Possible Solutions
Possible Solutions
344.
for details.
Possible Solutions
for details.
Possible Solutions
344.
Possible Solutions