n
Connected Machinery Vibrates When Motor Rotates
Excessive Motor Oscillation and Erratic Rotation
Cause
Possible Solutions
Poor balance between motor phases.
Check drive input power voltage to ensure that it provides stable power.
Unexpected Noise from Connected Machinery
Cause
Possible Solutions
The carrier frequency is at the resonant
frequency of the connected machinery.
Adjust the carrier frequency using parameters C6-02 through C6-05.
The drive output frequency is the same as
the resonant frequency of the connected
machinery.
• 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.
Note:
The drive may have trouble assessing the status of the load due to white noise generated when using
Swing PWM (C6-02 = 7).
n
Oscillation or Hunting
Cause
Possible Solutions
Insufficient tuning.
Adjust Hunting prevention Gain Setting (n1-02).
The frequency reference is assigned to an
external source and the signal is noisy.
• 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).
The cable between the drive and motor is
too long.
• Reduce the length of the cable.
n
Motor Rotates After the Drive Output is Shut Off
Cause
Possible Solutions
Low DC Injection Braking and the drive
cannot decelerate properly.
• Adjust the DC Injection braking settings.
• Increase the value of b2-02 (DC Injection Braking Current).
• Increase the b2-04 (DC Injection Braking Time at Stop).
n
ov or Speed Loss Occurs When Starting into a Rotating Load
Cause
Possible Solutions
The load is already rotating when the drive
is trying to start it.
• Stop the motor using DC Injection braking. Restart the motor.
• Increase the value of b2-03 (DC Injection Braking Time at start).
• Set a multi-function input terminal for external Speed Search command
(H1-
oo
=“61” or “62” during restart).
5.8 Troubleshooting without Fault Display
162
YASKAWA ELECTRIC TOEP C710606 25D YASKAWA AC Drive J1000 Installation & Start-Up Manual
