YASKAWA V1000 Series

5.10 Detailed Troubleshooting
256 YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
■ Load Falls When Brake is Applied (Hoist-Type Applications)
■ 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
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 multi-function contact output terminal MA, MB, MC for
frequency detection.
• Multi-function contact output terminal will switch off when the output
frequency is greater than the frequency detection level set in L4-01. Set
L4-01 between 3.0 and 5.0 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 0.5 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 is tripping
MCCB.
• Decrease the sensitivity of the GFCI, or use a different GFCI with a
higher threshold.
• Lower the carrier frequency (C6-02).
• Reduce the length of the cable used between the drive and the motor as
much as possible.
• Install a noise filter on the output side of the drive.
Cause Possible Solutions
Poor balance between motor phases.
Check the drive input power voltage to ensure that it provides stable
power.