YASKAWA A1000 Series Technical Manual page 316

6.4 Fault Detection
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
PG cable is disconnected.
PG cable wiring is wrong.
PG has no power.
PG encoder brake is clamped shut.
Digital Operator Display
Cause
PG cable is disconnected.
Digital Operator Display
Cause
The proper braking resistor option has not been
installed.
Regenerative converter, regenerative unit, or braking
unit is being used.
Digital Operator Display
Cause
Deceleration time is too short and excessive regenerative
energy is flowing back into the drive.
Excessive braking inertia.
The braking operation duty cycle is too high.
The proper braking resistor has not been installed.
Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more frequently than it is rated for trips the alarm
even when the braking resistor surface is not very hot.
Digital Operator Display
Cause
The braking transistor is damaged.
The control circuit is damaged.
Digital Operator Display
Cause
Speed Search parameters are set to the wrong values.
The motor is coasting in the opposite direction of the
Run command.
316
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 your nearest
sales representative.
Check for anything 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 your
nearest sales 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.
Reconnect the cable.
Braking Resistor Fault
rF
The resistance of the braking resistor being used is too low.
Select the braking resistor option so that fits to the drives braking transistor specification.
Disable the braking transistor protection selection (set L8-55 to 1).
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 inertia.
• Increase the deceleration times (C1-02, C1-04, C1-06, C1-08, C1-09).
• Replace the dynamic braking option with a larger device that can handle the power that is discharged.
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings.
Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors (L8-01 = 1) allows a braking
duty cycle of maximum 3%.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Dynamic Braking Transistor
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 your
nearest sales representative.
Too Many Speed Search Restarts
SEr
The number of Speed Search restarts exceeded the number set to b3-19.
• Reduce the detection compensation gain during Speed Search (b3-10).
• Increase the current level when attempting Speed Search (b3-17).
• Increase the detection time during Speed Search (b3-18).
• Repeat Auto-Tuning.
Enable Bi-Directional Speed Search (b3-14 = 1).
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on page 66
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Diagnosing and Resetting Faults on page
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
334.