YASKAWA A1000 Series Technical Manual page 317

Digital Operator Display
Cause
The wrong motor code is set (Yaskawa motors only).
Load is too heavy.
Load inertia is too heavy.
Acceleration and deceleration times are too short.
Speed response is too slow.
Digital Operator Display
Cause
Torque limit is set too low.
Excessive load torque.
Noise interference along PG encoder wiring.
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
There is a fault on the machine side.
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
There is a fault on the machine side.
Digital Operator Display
Cause
Undertorque was detected and matched the conditions
for mechanical loss detection set to L6-08.
Digital Operator Display
Cause
Input power phase loss.
One of the drive input power wiring terminals is loose.
There is a problem with the voltage from the drive input
power.
The power has been interrupted.
The main circuit capacitors are worn.
The relay or contactor on the soft-charge bypass circuit
is damaged.
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Motor Pull Out or Step Out Detection
STo
Motor pull out or step out has occurred. Motor has exceeded its pull-out torque.
• Enter the correct motor code for the PM being used into E5-01.
• For special-purpose motors, enter the correct data to all E5 parameters according to the test report provided for the motor.
• Increase the load inertia for PM motor (n8-55).
• Increase the pull-in current during accel/decel (n8-51).
• Reduce the load.
• Increase the motor or drive capacity.
Increase the load inertia for PM motor (n8-55).
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Increase the S-curve acceleration and deceleration times (C2-01).
Increase the load inertia for PM motor (n8-55).
Zero Servo Fault
SvE
Position deviation during zero servo.
Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Reduce the amount of load torque.
Check the PG signal for noise interference.
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).
Check the settings of parameters L6-05 and L6-06.
Check the load for any problems.
Mechanical Weakening Detection 2
UL5
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
DC Bus Undervoltage
One of the following conditions occurred while the drive was stopped:
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
Uv1
• For 200 V class: approximately 190 V
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400) The fault is output only if L2-01 = 0 or L2-01 = 1
and the DC bus voltage has fallen below the level set to L2-05 for longer than the time set to L2-02.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
page 66
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main circuit magnetic contactor.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
6.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on
6
317