The weather has a significant impact on logistics delivery equipment. Some customers have reported issues with drive equipment in the workshop failing to start or triggering alarms during cold snaps. Let’s take a look at the causes of these problems and the solutions.
1. Causes of the Problems
1. Taking the stacker’s walking mechanism as an example, when the weather is cold, the bearings of external equipment or the bearings and lubricating oil of the drive reduction motor can create additional resistance, similar to how a car engine behaves in cold conditions.
2. The starting capability of the motor decreases in low-temperature conditions. The starting capability of the motor is related to the resistance of its rotor; the lower the temperature, the lower the resistance, resulting in a smaller starting torque, especially for motors running at 87HZ or asynchronous servo motors.
3. The motor brake can easily condense and solidify in cold conditions. Although the brake is powered, it may fail to release.
2. Solutions
1. For cold regions (below -10°), it is recommended to use low-temperature synthetic oil for the reducer, add heating belts to the motor, and implement heating measures for the brake to ensure the motor’s starting capability.
2. During the initial design selection, if extreme low temperatures are anticipated, it is essential to assess the additional resistance at low temperatures and ensure the motor has a sufficient margin to avoid failure to start (typically, for low temperatures between -40° and -25°, the motor power should be increased by one level). The inverter should also be evaluated for low-temperature capability, as some inverters may not function at low temperatures.
3. If machines that are already in use frequently fail to start initially, it is advisable to preheat them for a dry run. Alternatively, consider increasing the motor’s minimum starting frequency, extending the acceleration time, and adding low-frequency voltage compensation.
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