Improper Setting of Speed Search related
parameters (including Speed Search after a
momentary power loss and after a fault restart)
• Check the settings for Speed Search-related parameters.
• Enable Speed Search restart function (b3-19 greater than or equal to 1 to 10).
• Adjust the current level during Speed Search and the deceleration time (b3-02 and b3-03 respectively).
• Perform Stationary Auto-Tuning for line-to-line resistance and then enable Speed Estimation Speed
Search (b3-24 = 1).
Drive input power voltage is too high
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The braking transistor is wired incorrectly
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
PG cable is disconnected Reconnect the cable.
PG cable wiring is wrong Correct the wiring.
Noise interference along the PG encoder
wiring
Separate the wiring from the source of the noise (often the output lines from the drive).
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 the load inertia ratio in L3-25 to better match the load.
Braking function is being used in OLV/PM Connect a braking resistor.
Motor hunting occurs
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
• Adjust the AFR time constant (n2-02 and n2-03).
• Adjust the speed feedback detection suppression gain for PM motors (n8-45) and the time constant for
pull-in current (n8-47).
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 as specified in this manual. Refer to Wire Gauges and Tightening
Torque on page 58.
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.
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 capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor, contact
Yaskawa or a Yaskawa representative.
• Check for problems with the drive input power. If drive input power appears normal but the alarm
continues to occur, replace either the control board or the entire drive. For instructions on replacing the
control board, contact Yaskawa or a Yaskawa representative.
Digital Operator Display Fault Name
PGo
PG Disconnect (for any control modes using a PG option card)
No PG pulses are received for longer than the time set to F1-14.
Cause Possible Solution
PG cable is disconnected Reconnect the cable.
PG cable wiring is wrong Correct the wiring.
PG has no power Check the power line to the PG encoder.
PG encoder brake is clamped shut Ensure the motor brake releases properly.
Digital Operator Display Fault Name
PGoH
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable is not connected properly.
Cause Possible Solution
6.4 Fault Detection
312
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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