Overload trip, also known as current overload protection, is one of the most common electrical failures in screw air compressors. Frequent overload shutdowns can interrupt production, increase maintenance costs, and reduce compressor lifespan.
Understanding the root causes and applying proper troubleshooting methods are essential for maintaining stable and energy-efficient compressor operation.
An overload trip occurs when the compressor motor draws excessive current beyond its rated operating range. To protect the motor and electrical system, the compressor automatically shuts down.
Frequent overload trips indicate that the compressor may have mechanical, electrical, or operating problems.
Low or unstable voltage can increase motor current and trigger overload protection.
If discharge pressure exceeds the rated pressure, the motor load increases significantly.
High pressure directly leads to higher current consumption.
Loose wiring, burnt contacts, or faulty contactors may cause unstable current flow.
Possible issues include:
A blocked oil separator creates excessive internal pressure resistance, increasing operating current.
Check and correct unstable or undervoltage conditions.
Inspect pressure settings and eliminate high-pressure operating conditions.
Faulty contactors are one of the most common electrical causes of overload trips.
If rotational resistance is too high, professional maintenance or overhaul may be required.
Regular replacement improves airflow and reduces internal resistance.
Modern two-stage screw air compressors are designed to operate with:
Compared with conventional single-stage compressors, two-stage compressors can significantly reduce overload risk and improve long-term reliability.
To reduce overload trips:
Preventive maintenance helps extend compressor lifespan and reduce unexpected downtime.
Screw air compressor overload trips are usually caused by electrical problems, excessive pressure, or internal mechanical resistance.
By identifying the root cause and applying the correct solution, factories can improve equipment reliability and reduce energy consumption.
Upgrading to an energy-efficient two-stage screw air compressor is one of the most effective long-term solutions for improving compressor stability and reducing overload risks.
Common causes include low voltage, excessive pressure, clogged filters, or air-end problems.
Yes. Undervoltage increases motor current and may trigger overload protection.
Check pressure settings, electrical connections, and internal mechanical resistance.
Yes. They operate at lower temperatures and lower motor load, improving reliability and energy efficiency.
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