YASKAWA CIMR-VU BA0001 Technical Manual page 278

6.4 Fault Detection
Digital Operator Display
Drive fails to operate properly due to noise
interference.
Load inertia has been set incorrectly.
Braking function is being used in PM Open
Loop Vector Control.
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
Pulse input (RP) is disconnected.
Pulse input (RP) wiring is wrong.
Motor brake engaged.
Digital Operator Display
Cause
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive.
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• 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 L3-25 (Load Inertia Ratio) in accordance with the load.
Connect a braking resistor.
• 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).
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 specified in this manual to fasten the terminals.
and Tightening Torques on page 58
• 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.
• 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.
PG Disconnect (for Simple V/f with PG)
PGo
No PG pulses are received for longer than the time set to F1-14.
Reconnect the pulse input (RP).
Correct the wiring.
Ensure the motor brake releases properly.
Braking Resistor Overheat
rH
Braking resistor protection was triggered.
Fault detection is enabled when L8-01 = 1 (disabled as a default).
• Check the load, deceleration time and speed.
• Reduce the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Replace the braking option with a larger device that can handle the power that is discharged.
Fault Name
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Refer to Wire Gauges