YASKAWA A1000 Series Technical Manual page 314

6.4 Fault Detection
Digital Operator Display
Cause
Load is too heavy.
Cycle times are too short during acceleration and
deceleration.
A general purpose motor is driven below the rated speed
with too high load.
The output voltage is too high.
The wrong motor rated current is set to E2-01.
The maximum output frequency is set incorrectly.
Multiple motors are running off the same drive.
The electrical thermal protection characteristics and
motor overload characteristics do not match.
The electrical thermal relay is operating at the wrong
level.
Motor overheated by overexcitation operation.
Speed Search related parameters are set incorrectly.
Output current fluctuation due to input phase loss
Digital Operator Display
Cause
Load is too heavy.
Acceleration or deceleration times are too short.
The output voltage is too high.
Drive capacity is too small.
Overload occurred when operating at low speeds.
Excessive torque compensation.
Speed Search related parameters are set incorrectly.
Output current fluctuation due to input phase loss
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
Fault on the machine side (e.g., machine is locked up).
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
Digital Operator Display
Cause
Overtorque triggered mechanical weakening detection
level set to L6-08.
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Motor Overload
oL1
The electronic motor overload protection tripped.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor specifically designed to
operate in the desired speed range.
Adjust the user-set V/f patterns (E1-04 through E1-10). Parameters E1-08 and E1-10 may need to be reduced. Be careful not to
lower E1-08 and E1-10 too much because this reduces load tolerance at low speeds.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Disable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
• Overexcitation increases the motor losses and the motor temperature. If applied too long, motor damage can occur. Prevent
excessive overexcitation operation or apply proper cooling to the motor.
• Reduce the excitation deceleration gain (n3-13).
• Set L3-04 (Stall Prevention during Deceleration) to a value other than 4.
• Check values set to Speed Search related parameters.
• Adjust the Speed Search current and Speed Search deceleration times (b3-02 and b3-03 respectively).
• After Auto-Tuning, enable Speed Estimation Speed Search (b3-24 = 1).
Check the power supply for phase loss.
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 excessively because this reduces load tolerance at low speeds.
Replace the drive with a larger model.
• Reduce the load when operating at low speeds.
• Replace the drive with a model that is one frame size larger.
• Lower the carrier frequency (C6-02).
Reduce the torque compensation gain (C4-01) until there is no speed loss but less current.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search and the Speed Search deceleration time (b3-03 and b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Estimation Speed Search (b3-24 = 1).
Check the power supply for phase loss.
Overtorque Detection 1
oL3
The current has exceeded the 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 status of the load. Remove the cause of the fault.
Overtorque Detection 2
oL4
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Mechanical Weakening Detection 1
oL5
Overtorque occurred, matching the conditions specified in L6-08.
Check for the cause of mechanical weakening.
Fault Name
Possible Solution
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Possible Solution
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Possible Solution
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Possible Solution
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual