YASKAWA J1000 Technical Manual page 151

6.8 Troubleshooting without Fault Display
n Deceleration Takes Longer Than Expected when Using a Braking Resistor
Cause
L3-04 is set incorrectly.
The deceleration time is set too long.
Insufficient motor torque.
Load exceeded the internal torque limit determined by
the drive rated current.
n Motor Hunting Occurs When Operating With a Light Load
Cause
Carrier frequency is too high.
Large V/f setting value at low speeds triggers
overexcitation.
The maximum output frequency and the base
frequency reference are not set properly in relationship
to each other.
Hunting Prevention is set up incorrectly.
n Noise From Drive or Output Lines When the Drive is Powered On
Cause
Relay switching in the drive
generates excessive noise.
n Ground Fault Circuit Interrupter (GFCI) Trips During Run
Cause
Excessive leakage current trips
MCCB.
n Connected Machinery Vibrates When Motor Rotates
Excessive Motor Oscillation and Erratic Rotation
Cause
Poor balance between motor phases.
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 when using Swing PWM (C6-02 = 7).
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• Check the Stall Prevention Level during deceleration (L3-04).
• If a braking resistor option has been installed, disable Stall Prevention during deceleration
(L3-04 = "0").
Set deceleration to more appropriate time (C1-02 and C1-04).
• Assuming parameter settings are normal and that no overvoltage occurs when there is
insufficient torque, it is likely that the demand on the motor has exceeded the motor capacity.
• Use a larger motor.
Switch to a larger capacity drive.
Lower the carrier frequency setting C6-02.
• Use parameters E1-04 through E1-10 to set the V/f pattern in relation to the load characteristics.
Set the proper values for the maximum output frequency and base frequency (E1-04, E1-06).
Adjust the hunting prevention gain (n1-02).
• Lower the carrier frequency (C6-02).
• Install a noise filter on the input side of drive input power.
• Install a noise filter on the output side of the drive.
• Place the wiring inside a metal conduit to shield it from switching noise.
• Ground the drive and motor properly.
• Separate the main circuit wiring and the control lines.
• 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.
Check drive input power voltage to ensure that it provides stable power.
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.
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Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual