Noise From Drive Or Output Lines When The Drive Is Powered On; Earth Leakage Circuit Breaker (Elcb) Trips During Run; Connected Machinery Vibrates When Motor Rotates; Pid Output Fault - YASKAWA A1000 Series Technical Manual

6.10 Troubleshooting without Fault Display

◆ Noise From Drive or Output Lines When the Drive is Powered On

Cause
Relay switching in the drive generates
excessive noise.

◆ Earth Leakage Circuit Breaker (ELCB) Trips During Run

Cause
Excessive leakage current trips ELCB.

◆ 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: 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 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.
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• 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.
• Make sure wires and the motor have been properly grounded.
• Increase the ELCB sensitivity or use ELCB 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. Set the carrier frequency to 2 kHz when connecting a reactor.
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 152
• 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 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 152
Perform Auto-Tuning. Refer to
Perform Auto-Tuning again.
Perform Rotational Auto-Tuning.
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
296.
for details.
Possible Solutions
for details.
Possible Solutions
Motor Performance Fine-Tuning on page 296.