YASKAWA U1000 - Page 379

Digital Operator Display Fault Name
Output current fluctuation due to power
supply loss
Check the power supply for phase loss.
Digital Operator Display Fault Name
oL2
Drive Overload
The thermal sensor of the drive triggered overload protection.
Cause Possible Solution
Load is too heavy Reduce the load.
Acceleration or deceleration time is too short Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
V/f voltage characteristics are not suitable. Set V/f pattern setting parameters E1-04 through E1-10 to match the motor characteristics.
Drive capacity is too small Use a larger drive.
Overload occurred when operating at low
speeds
• Reduce the load when operating at low speeds.
• Use a larger drive.
• Lower the carrier frequency (C6-02).
Excessive torque compensation Reduce the torque compensation gain in parameter C4-01 until there is no speed loss but less current.
Parameters related to Speed Search are set
incorrectly
• Check the settings for all Speed Search related parameters.
• Adjust the current used during the Speed Search deceleration time (b3-03).
• Reduce the Speed Search Operation Current Level 1 (Current Detection Type 3, Current Detection
Type 3, Speed Estimation Type 2) (b3-31).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Output current fluctuation due to input phase
loss
Check the power supply for phase loss.
Digital Operator Display Fault Name
oL3
Overtorque Detection 1
The current has exceeded the value set for Torque Detection Level 1 (L6-02) for longer than the allowable
time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check L6-02 and L6-03 settings.
Fault on the machine side (e.g., machine is
locked up)
Check the status of the load. Remove the cause of the fault.
Digital Operator Display Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Torque Detection Level 2 (L6-05) for longer than the allowable
time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the
load
Check the settings of parameters L6-05 and L6-06.
Digital Operator Display Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solution
Overtorque triggered mechanical weakening
detection level set to L6-08
Identify the cause of mechanical weakening.
Digital Operator Display Fault Name
oPr
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
Note: An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
Cause Possible Solution
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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Troubleshooting