High Operating Current of Screw Air Compressor – Troubleshooting Guide

2025,08,10

When the operating current of an Screw Air Compressor is high, troubleshoot as follows:

1. Voltage Too High or Too Low

The normal voltage is 380V, with an error within 10%.

2. Contactor Fails to Close Tightly

For a 50Hz - powered compressor, check if the contact points of the contactor are normal.

3. Set Pressure Higher Than Factory - set Pressure Value

The set pressure shall not exceed the maximum pressure value indicated on the compressor's nameplate.

4. Air Compressor Fails to Unload and Run

Check if the air inlet valve is completely closed during the compressor's unloading process.

5. Clogged Oil - Gas Separation Core

Check if the oil - gas separation core hasn't been replaced for a long time, as this can cause blockage.

6. Drive Belt Too Loose or Too Tight (for Old Machines)

For old machines, check if the tightness of the drive belt is appropriate.

7. Minimum Pressure Valve Not Opened

Check if the minimum pressure valve is fully opened.

8. Pressure Sensor Malfunction

The pressure sensor may be insensitive or provide inaccurate data.

9. Display Screen Malfunction

Measure whether the actual current matches the current shown on the display.

10. Air Compressor Beyond Maintenance Interval

Timely maintain the air compressor, and replace the three filters and the lubricating oil.

11. Aging Power Cord

Replace the power cord or tighten the terminal screws.

12. Motor Bearing Wear

Check if the motor bearings are worn.

13. Internal Bearing Wear of the Compressor Head

Replace the internal bearings of the compressor head if there is excessive end - face clearance.

14. Aging Motor Coil or Demagnetization of Permanent Magnet Motor

Check if the motor coil is aging or if the permanent magnet motor has become demagnetized.

Author:

Mr. Grace

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