Top 10 Reasons for Excessive Current in Screw Type Air Compressors and How to Fix Them

Excessive current in Screw Type Air Compressors can cause severe damage, including burning out the motor. To avoid costly repairs, it’s essential to understand the common causes of excessive current and the appropriate solutions. Below is a comprehensive guide to the main reasons behind high motor current and how to address them.

1. High Ambient Temperature

If the air compressor operates in an environment where the temperature is too high, it can cause the motor to overheat and draw excessive current.

Solution: Install proper ventilation or air duct exhaust systems to ensure the compressor remains cool and runs efficiently.

2. Unstable or Low Three-Phase Voltage

Unstable power supply, missing phases, or low voltage (below 10% of the required voltage) can lead to excessive current in the motor.

Solution: Upgrade or repair the power system to provide stable voltage to the air compressor.

3. Overload Protector Failure

A malfunctioning overload protector will fail to safeguard the motor from drawing too much current.

Solution: Replace the overload protector with a functional one to ensure the motor is protected from excessive load.

4. Poor Starter Contact

A poor connection at the starter of the air compressor can result in electrical inefficiency, causing excessive current.

Solution: Regularly maintain and clean the starter contacts to ensure proper connection.

5. Blocked Oil-Gas Separator

If the oil-gas separator becomes blocked, it can increase pressure and force the motor to work harder, drawing more current.

Solution: When the pressure difference exceeds 0.8-1kg, replace the oil-gas separator to restore normal function.

6. Lack of Lubrication in Motor Bearings

Insufficient lubrication in the motor bearings will cause friction, leading to increased motor load and excessive current.

Solution: Regularly lubricate the motor bearings with grease or oil to reduce friction.

7. Damaged Motor Bearings

Damaged bearings can also create excessive friction, which puts more strain on the motor and leads to high current consumption.

Solution: Replace the damaged motor bearings as soon as possible to prevent further damage.

8. Poor Motor Insulation

If the motor’s insulation is compromised, it can lead to short circuits or inefficient energy transfer, causing excessive current.

Solution: Remove the motor and perform insulation strengthening to prevent electrical leaks.

9. Loose Motor Wiring

Loose connections in the motor wiring can cause poor electrical flow, leading to higher current draw.

Solution: Regularly inspect and re-tighten all motor wiring connections.

10. Blocked Screw Type Air Compressors Inlet

A blocked inlet prevents proper air intake, which forces the motor to work harder, leading to an increase in current.

Solution: Clean and maintain the air compressor inlet regularly to ensure smooth airflow.

11. Clogged Air Filter

A clogged air filter can restrict airflow, causing the motor to overwork and draw more current.

Solution: Replace the air filter to maintain efficient air intake and reduce motor load.

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