When operating the stop button on the inverter panel manually, it's important to observe the motor's running process and the inverter display for any signs of abnormal behavior. If the inverter triggers overcurrent protection during the start or stop of the motor, you should adjust the acceleration and deceleration times accordingly. The motor's acceleration and deceleration depend on the torque available, and the rate at which the inverter changes frequency is set by the user. However, if the motor's inertia or load changes, the preset frequency change rate may not match the motor's speed response, leading to insufficient torque, motor stalling, or excessive current or voltage. Therefore, it's essential to set the acceleration and deceleration time based on the motor's inertia and load to ensure a smooth synchronization between the motor speed and inverter output frequency.
To check whether these settings are reasonable, start by selecting the acceleration and deceleration time based on your experience. If overcurrent occurs during startup, consider increasing the acceleration time slightly. Similarly, if overcurrent happens during braking, extend the deceleration time. However, be cautious not to set these times too long, as this could reduce production efficiency, especially in applications that require frequent starts and stops.
If the inverter continues to trigger protection after a short period, consider changing the start/stop curve from a straight line to an S-shaped, U-shaped, or anti-U-shaped profile. For motors with high inertia or heavy loads, longer start/stop times and appropriate curve types should be used based on the specific load characteristics.
If the inverter still experiences operational faults, try increasing the maximum current protection value, but never disable the protection entirely. Always leave a safety margin of at least 10% to 20%. If the issue persists, it may be necessary to replace the inverter with a higher power model to handle the increased load effectively.
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