n
Ground Fault Circuit Interrupter (GFCI) Trips During Run
Cause Possible Solutions
Excessive leakage current trips MCCB.
• Increase the GFCI sensitivity or use GFCI with a higher threshold.
• Lower the carrier frequency (C6-02).
• Reduce the length of the cable used between the drive and the motor.
• Install a noise filter or reactor on the output side of the drive.
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) Default setting is 7 for Normal Duty.
n
Oscillation or Hunting
Cause Possible Solutions
Insufficient tuning.
Reduce the gain.
• n1-02 (Hunting Prevention Gain Setting)
The frequency reference is assigned to an
external source.
• 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
148
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
2/6/2008-14:44
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