I. Core Judgment Methods
1. Current Monitoring: Use a clamp meter to measure the motor's operating current. If it consistently exceeds the rated current (usually indicated on the nameplate), an overload is possible.
2. Operating Status Observation:
Sound: The motor emits a dull, labored humming sound.
Speed: The drum speed decreases significantly or becomes unstable.
Temperature: The motor casing or control cabinet becomes abnormally hot.
3. Alarm Signals: Check the control panel for overload alarm lights or fault codes.
4. Protector Activation: If the motor protector trips and cuts off power, an overload is confirmed.
II. Quick Judgment Steps
1. Immediate Observation: Check the motor ammeter and control panel for alarms.
2. Preliminary Judgment: Excessive current or an alarm generally confirms an overload.
3. Verification and Confirmation: If there is no alarm but overload is suspected, use a clamp meter to measure the current to verify.
4. Recording and Processing: Record current value, time, and load conditions, and promptly stop the machine for inspection.
III. Preventive Measures
1. Proper Settings: Ensure the rated current of the motor protector matches the motor.
2. Regular Maintenance: Check the lubrication of the motor bearings and transmission system to reduce mechanical resistance.
3. Standardized Operation: Avoid overload operation and maintain stable tension and speed.
IV. Precautions
1. Distinguish from Overload: Overload is a continuous exceedance of current, distinct from a short circuit (instantaneous high current).
2. Comprehensive Judgment: Combine information from multiple aspects such as current, sound, temperature, and alarms to avoid misjudgment.
