YASKAWA L1000V Technical Manual page 175

Ground fault in the output circuit causes the DC bus
capacitor to overcharge.
Drive input power voltage is too high.
The braking transistor is wired incorrectly.
Encoder cable is disconnected.
Encoder cable wiring is wrong.
Noise interference along the encoder wiring.
Drive fails to operate properly due to noise interference.
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.
The main circuit capacitors are worn.
Digital Operator Display
Cause
Encoder cable is disconnected.
Encoder cable wiring is wrong.
Encoder has no power.
Motor brake is not released.
During Rescue Operation, either the DC bus voltage
dropped below S4-12 × (S4-13 - 10%), or 100 ms after
triggering Rescue Operation, the DC bus voltage did not
reach S4-12 × S4-13 before the motor started.
Digital Operator Display
Cause
The braking transistor is damaged.
The control circuit is damaged.
Digital Operator Display
Cause
There is a problem with the motor contactor or auxiliary
switch.
Digital Operator Display
Cause
The motor contactor is open.
Digital Operator Display
Cause
The motor contactor opened.
Digital Operator Display
Cause
The feedback contact on the brake is broken or the
wiring is incorrect.
YASKAWA EUROPE SIEP
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• 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.
• Adjust the parameters that control hunting.
• Adjust the AFR time constant (n2-02 and n2-03).
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.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Stabilize drive input power or disable phase loss detection.
• 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.
Encoder Disconnected (for simple PG feedback control modes)
PGo
No encoder pulses are received for longer than the time set to F1-14.
Reconnect the cable.
Correct the wiring.
Check the power line to the encoder.
Ensure the motor brake releases properly.
• Check the DC bus voltage setting for Rescue Operation (S4-12).
• Lower the speed reference set for Rescue Operation (d1-25).
• Check the backup power supply. It may need to be replaced with another UPS if it has become worn and can no longer provide
enough power.
Dynamic Braking Transistor Fault
rr
The built-in dynamic braking transistor failed.
• Cycle power to the drive and check if the fault reoccurs.
• Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or a
Yaskawa representative.
Motor Contactor Response Error
SE1
Motor contactor does not respond within the time set to S1-10 (Run Command Delay Time).
Check the motor contactor, auxiliary switches and the wiring of the contactor feedback signal.
Starting Current Error
SE2
The output current was lower than 25% of the motor no-load current at start.
Check the contactor for any problems.
Output Current Error
SE3
The output current was lower than 25% of the motor no-load current during operation.
Check the contactor for any problems.
Brake Feedback Error
SE4
The input terminal set for "Brake feedback" (H1-
terminal set for "Brake release" (H2-
Check the brake feedback contact and the wiring.
YASKAWA AC Drive L1000V Technical Manual
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on page 50
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
= 79) did not respond within the SE4 error time set to S6-05 after an output
= 50) closed.
Possible Solution
6.3 Fault Detection
187.
6
175