YASKAWA AC Drive-A1000 Technical Manual page 312

6.4 Fault Detection
Improper Setting of Speed Search related
parameters (including Speed Search after a
momentary power loss and after a fault restart)
Drive input power voltage is too high
The braking transistor is wired incorrectly
PG cable is disconnected
PG cable wiring is wrong
Noise interference along the PG encoder
wiring
Drive fails to operate properly due to noise
interference
Load inertia has been set incorrectly
Braking function is being used in OLV/PM
Motor hunting occurs
Digital Operator Display
Cause
There is phase loss in the drive input power
There is loose wiring in the drive input power
terminals
There is excessive fluctuation in the drive
input power voltage
There is poor balance between voltage phases • Stabilize drive input power or disable phase loss detection.
The main circuit capacitors are worn
Digital Operator Display
Cause
PG cable is disconnected
PG cable wiring is wrong
PG has no power
PG encoder brake is clamped shut
Digital Operator Display
Cause
312
• 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).
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Reconnect the cable.
Correct the wiring.
Separate the wiring from the source of the noise (often the output lines from the drive).
• 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.
• 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.
Connect a braking resistor.
• 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).
Input Phase Loss
PF
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when
L8-05 = 1 (enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
Torque on page
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• 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.
PG Disconnect (for any control modes using a PG option card)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the cable.
Correct the wiring.
Check the power line to the PG encoder.
Ensure the motor brake releases properly.
PG Hardware Fault (detected when using a PG-X3 option card)
PGoH
PG cable is not connected properly.
Fault Name
Possible Solution
58.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
Refer to Wire Gauges and Tightening