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6.4 Fault Detection
362
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Digital Operator Display
Fault Name
oL1
Motor Overload
The electronic motor overload protection tripped.
Cause
Possible Solution
Load is too heavy.
Reduce the load.
Note:
After the value of U4-16 has decreased to one less than 100, reset oL1. The value of U4-16 must be less than 100 before
oL1 can be reset.
Cycle times are too short during acceleration and
deceleration.
Increase the acceleration and deceleration times (C1-01 through C1-08).
A general purpose motor is driven below the rated speed
with too high load.
• 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.
V/f characteristics (voltage and frequency) are not
suitable.
Set the V/f pattern setting parameters E1-04 through E1-10 so that they match the motor characteristics.
The wrong motor rated current is set to E2-01.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
Multiple motors are running off the same drive.
Disable the motor protection function (L1-01 = 0) and install a thermal relay to each motor.
The electrical thermal protection characteristics and
motor overload characteristics do not match.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the wrong
level.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
Motor overheated by overexcitation operation.
• 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.
Speed Search related parameters are set incorrectly.
• Check values set to Speed Search related parameters.
• 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, enable Speed Estimation Speed Search (b3-24 = 1).
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 times are too short.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
A V/f characteristic (voltage) is not suitable.
Set the V/f pattern setting parameters E1-04 through E1-10 so that they 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 (C4-01) until there is no speed loss but less current.
Speed Search related parameters 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 the drive, enable the Speed Estimation Speed Search (b3-24 = 1).
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 the settings of parameters L6-02 and L6-03.
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.
Check for the cause of mechanical weakening.
SIEP_C710636_02B_1_0.book 362 ページ 2015年11月25日 水曜日 午後4時56分