YASKAWA A1000 Series Quick Start Manual page 108

5 Troubleshooting
The main circuit capacitors are worn.
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
Parameter settings are not appropriate for
the load.
There is a fault on the machine side.
Digital Operator Display
108
• 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.
PG Hardware Fault (detected when using a PG-X3 option card)
PGoH
PG cable is not connected properly.
Braking Resistor Fault
rF
The resistance of the braking resistor being used is too low.
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.
Motor Pull Out or Step Out Detection
STo
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
Zero Servo Fault
SvE
Position deviation during zero servo.
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the
allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the
allowable time (L6-06).
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide