YASKAWA V1000

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.
Load inertia has been set
incorrectly.
• Check the load inertia settings when using KEB, overvoltage suppression or
Stall Prevention during deceleration.
• Adjust L3-25 (Load Inertia Ratio) in accordance with the load.
Braking function is being used in
PM Open Loop Vector Control.
Connect a braking resistor.
Motor hunting occurs.
• Adjust the parameters that control hunting.
• Set the hunting prevention gain (n1-02).
• Adjust the AFR time constant 1 (n2-02) and the AFR time constant 2 (n2-03)
when in OLV Control.
• Use parameters n8-45 (PM Speed Feedback Detection Suppression Gain)
and n8-47 (Pull-In Current Compensation Time Constant).
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.
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.
The main circuit capacitors are
worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the drive if U4-05 is greater than 90%.
• Check for anything wrong with the drive input power.
• If nothing is wrong with the drive input power, try the following solutions if
the alarm continues:
• Disable Input Phase Loss Protection selection (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.
• Replace the drive.
5.2 Fault Detection
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YASKAWA ELECTRIC TOEP C710606 47A YASKAWA AC Drive – V1000 Quick Start Guide