Code oL1: Motor Overload

Code type: Fault Manual section: Yaskawa A1000 Troubleshooting 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 to E1-10) to 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. - Set n3-23 (Overexcitation Operation Selection) to 0 (disabled). Speed Search related parameters are set incorrectly. - 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). Output current fluctuation due to power supply loss Check the power supply for phase loss.