5.11 Troubleshooting without Fault Display
YASKAWA ELECTRIC
TOEP C710687 02B FSDrive-MV1000 Instructions
187
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ubles
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ting
5
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Excessive Motor Oscillation and Erratic Rotation
u
Electrical Interference from Drive or Output Lines When the Drive is Powered On
u
Connected Machinery Vibrates When Motor Rotates
n
Unexpected Interference from Connected Machinery
n
Oscillation or Hunting
u
PID Output Fault
Cause
Possible Solutions
Poor balance between motor phases.
Check drive input power voltage to ensure that it provides stable power, or disable input
phase loss detection.
Hunting prevention function is disabled.
• Enable Hunting Prevention (n1-01 = 1).
• Increase the AFR gain (n2-01) or the AFR time constant (n2-02).
Cause
Possible Solutions
Relay switching in the drive generates excessive
electrical interference.
• 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.
Cause
Possible Solutions
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.
Cause
Possible Solutions
Insufficient tuning.
Perform Auto-Tuning. Refer to
Motor Performance Fine-Tuning on page 140
for
details.
Gain is too low when using PID control.
Make the adjustments by referring to the information on the PID control parameters
(b5-
) in the separate FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
The frequency reference is assigned to an external source
and the signal is noisy.
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).
The cable between the drive and motor is too long.
• Perform Auto-Tuning.
• Reduce the length of the cable.
Cause
Possible Solutions
No PID feedback input.
• 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.
The level of detection and the target value do not
correspond with each other.
• 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.
Reverse drive output frequency and speed detection.
When output frequency rises, the sensor detects a speed
decrease.
Set PID output for reverse characteristics (b5-09 = 1).
Adjustment made to PID parameter settings are
insufficient.
Make the adjustments by referring to the information on the PID control parameters
(b5-
) in the separate FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
Summary of Contents for FSDrive-MV1000 Series
Page 8: ...8 YASKAWA ELECTRIC TOEP C710687 02B FSDrive MV1000 Instructions...
Page 106: ...3 9 Wiring Check 106 YASKAWA ELECTRIC TOEP C710687 02B FSDrive MV1000 Instructions...
Page 210: ...6 7 Spare Parts 210 YASKAWA ELECTRIC TOEP C710687 02B FSDrive MV1000 Instructions...
Page 222: ...B 1 European Standards 222 YASKAWA ELECTRIC TOEP C710687 02B FSDrive MV1000 Instructions...
