Code oC: Overcurrent

Code type: Fault Manual section: Yaskawa A1000 Troubleshooting The motor has been damaged due to overheating or the motor insulation is damaged. - Check the insulation resistance. - Replace the motor. One of the motor cables has shorted out or there is a grounding problem. - Check the motor cables. - Remove the short circuit and power the drive back up. - Check the resistance between the motor cables and the ground terminal. - Replace damaged cables. The drive is damaged. - Check the drive output side short circuit for broken output transistor. B1 and U/V/W - (negative) and U/V/W - Contact your Yaskawa representative or nearest Yaskawa sales office. The load is too heavy. - Measure the current flowing into the motor. - Replace the drive with a larger capacity unit if the current value exceeds the rated current of the drive. - Determine if there is sudden fluctuation in the current level. - Reduce the load to avoid sudden changes in the current level or switch to a larger drive. The acceleration or deceleration times are too short. Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration time. If the right amount of torque cannot be set, make the following changes: - Increase the acceleration time (C1-01, -03, -05, -07) - Increase the S-curve characteristics (C2-01 through C2-04) - Increase the capacity of the drive. The drive is attempting to operate a specialized motor or a motor larger than the maximum size allowed. - Check the motor capacity. - Ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on the motor nameplate. Magnetic contactor (MC) on the output side of the drive has turned on or off. Set up the operation sequence so that the MC is not tripped while the drive is outputting current. V/f setting is not operating as expected. - Check the ratios between the voltage and frequency. - Set parameter E1-04 through E1-10 appropriately (E3-04 through E3-10 for motor 2). - Lower the voltage if it is too high relative to the frequency. Excessive torque compensation. - Check the amount of torque compensation. - Reduce the torque compensation gain (C4-01) until there is no speed loss and less current. Drive fails to operate properly due to electrical signal interference. - Review the possible solutions provided for handling electrical signal interference. - Review the section on handling electrical signal interference and check the control circuit lines, main circuit lines, and ground wiring. Overexcitation gain is set too high. - Check if fault occurs simultaneously to overexcitation function operation. - Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain). Run command applied while motor was coasting. - Enable Speed Search at start (b3-01 = 1). - Program the Speed Search command input through one of the multi-function contact input terminals (H1-□□ = 61 or 62). The wrong motor code has been entered for PM Open Loop Vector (Yaskawa motors only) or the motor data are wrong. - Enter the correct motor code to E5-01. - If a non-Yaskawa PM motor is used, enter “FFFF” to E5-01. Set the correct motor data to the E5-□□ parameters or perform Auto-Tuning. The overcurrent level has exceeded the value set to L8- 27. (PM control modes) Correct the value set to overcurrent detection gain (L8-27). The motor control method and motor do not match. - Check which motor control method the drive is set to (A1-02). - For IM motors, set A1-02 = “0”, “1”, “2”, or “3”. - For PM motors, set A1-02 = “5”, “6” or “7”. The drives rated output current is too small. Use a larger drive.