YASKAWA T1000V, Техническое руководство

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6.9 Troubleshooting without Fault Display
276 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
■ Load Falls When Brake is Applied
■ Noise From Drive or Output Lines When the Drive is Powered On
■
Ground Fault Circuit Interrupter (GFCI) Trips During Run
■ Connected Machinery Vibrates When Motor Rotates
Excessive Motor Oscillation and Erratic Rotation
Unexpected Noise from Connected Machinery
■ Oscillation or Hunting
Cause Possible Solutions
The timing for the brake to close and release is not
set properly.
Use frequency reference detection for closing and releasing the brake.
• At start: Release the brake after creating enough torque.
• At stop: Close the brake when the motor still produces torque.
Make the following setting changes to hold the brake:
• Set the frequency detection inactive during baseblock (L4-07 = 0).
• Multi-function contact output terminal will switch on when the output frequency is greater
than the frequency detection level set in L4-01. Set L4-01 between 1.0 and 3.0 Hz.
• Slipping may occur when stopping because hysteresis is used in Frequency Reference 2
(where the frequency agree setting in L4-02 is 2.0 Hz). To prevent this, change the setting
to 0.1 Hz.
• Do not use the multi-function contact output setting “During Run” (H2-01 = 0) for the
brake signal.
Insufficient DC Injection Braking. Increase the amount of DC Injection Braking (b2-02).
Cause Possible Solutions
Relay switching in the drive
generates excessive noise.
• 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.
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.
Cause Possible Solutions
Poor balance between motor phases. Check drive input power voltage to ensure that it provides stable power.
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.
Cause Possible Solutions
Insufficient tuning in Open Loop Vector Control
Adjust the following parameters in the order listed.
An increase in gain should be followed with an increase in the primary delay time constant.
• C4-02 (Torque Compensation Primary Delay Time)
• n2-01 (Speed Feedback Detection Control [AFR] Time Constant 1)
• C3-02 (Slip Compensation Primary Delay Time)
The response for torque compensation and slip compensation will drop as the time constant
is increased.
Auto-Tuning has not yet been performed (required
for Open Loop Vector Control).
Perform Auto-Tuning.
Set motor parameters after calculating the proper values.
Change the motor control method to V/f Control (A1-02 = “0”).
Insufficient tuning in V/f Control.
Reduce the gain.
• n1-02 (Hunting Prevention Gain Setting)
• n1-03 (Hunting Prevention Time Constant Setting)
Gain is too low when using PID control. Check the period of oscillation and adjust P, I, and D settings accordingly.