Excessive Motor Oscillation And Erratic Rotation; Electrical Interference From Drive Or Output Lines When The Drive Is Powered On; Connected Machinery Vibrates When Motor Rotates; Pid Output Fault - YASKAWA FSDrive-MV1000 Series Instructions For Use Manual

u Excessive Motor Oscillation and Erratic Rotation
Cause
Poor balance between motor phases.
Hunting prevention function is disabled.
u Electrical Interference from Drive or Output Lines When the Drive is Powered On
Cause
Relay switching in the drive generates excessive
electrical interference.
u Connected Machinery Vibrates When Motor Rotates
Unexpected Interference from Connected Machinery
n
Cause
The drive output frequency is the same as the resonant
frequency of the connected machinery.
Oscillation or Hunting
n
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.
u 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.
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
5.11 Troubleshooting without Fault Display
Check drive input power voltage to ensure that it provides stable power, or disable input
phase loss detection.
• Enable Hunting Prevention (n1-01 = 1).
• Increase the AFR gain (n2-01) or the AFR time constant (n2-02).
• Ground the drive (EA) and motor (EA).
• Separate the main circuit wiring and the control lines.
• Make sure wires and the motor have been properly grounded.
• 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
details.
Make the adjustments by referring to the information on the PID control parameters
(b5- ) in the separate FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
Ensure that electrical interference 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 analog input terminal settings.
Check that B (PID feedback) has been set for H3-02 (function selection for analog
input terminal L1).
Check that assignment to the analog input terminal and the actual signal input match.
• 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 gain H3-11 to adjust PID target and feedback signal scaling.
Set PID output for reverse characteristics (b5-09 = 1).
Make the adjustments by referring to the information on the PID control parameters
(b5- ) in the separate FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Motor Performance Fine-Tuning on page 140
Possible Solutions
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