Yaskawa J1000 Compact V/f Control Drive - Manual (Page 138)

Digital Operator Display Fault Name
Ground fault in the output circuit
causing the DC bus capacitor to
overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Excessive regeneration when
overshoot occurs after acceleration. Lengthen the S-curve at acceleration end.
Drive input power voltage is too
high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The dynamic braking transistor is
damaged.
Replace the drive.
The braking transistor is wired
incorrectly.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Drive fails to operate properly due
to noise interference.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit
lines, main circuit lines and ground wiring.
Motor hunting occurs.
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
Digital Operator Display Fault Name
PF
Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage between
phases. Detected when L8-05 = 1 (enabled).
Cause Possible Solution
There is phase loss in the drive
input power.
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive
input power terminals.
• Ensure the terminals are tightened properly.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torques on page 46 for details.
There is excessive fluctuation in the
drive input power voltage.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Disable Input Phase Loss Detection (L8-05 = “0”). PF is detected if DC bus
ripple is too high. If it is disabled, there is no fault but the ripple is still too
high, thereby the capacitors are stressed more and lose lifetime.
There is poor balance between
voltage phases.
• Stabilize drive input power or disable phase loss detection.
5.4 Fault Detection
138 YASKAWA ELECTRIC TOEP C710606 26D YASKAWA AC Drive – J1000 Quick Start Guide