An overload trip protects the motor from damage, but repeated trips mean something is wrong. The cause is usually electrical or mechanical.
Electrical Causes
- Low voltage or voltage imbalance.
- Loose or corroded connections.
- A failing motor or capacitor.
Mechanical Causes
- High load from a stiff air end.
- Blocked coolers raising operating temperature.
- Overpressure against a closed system.
What to Do
- Measure voltage and current during start and run.
- Check the overload setting is correct.
- Inspect the air end and cooling system.
Can I just reset the overload and restart?
Once to test is acceptable, but repeated trips need diagnosis before damage occurs.
Talk to an Engineer
Contact Panrui with your flow, pressure and air quality requirements to get a recommendation and factory quote for your project.