E-09/OL1/OL2 error is the result of an overloaded inverter. It could also be a high current drawn by the inverter or a rapid increase in current drawn.
E-09 /OL2 is displayed when the compressor is running and especially when there is no or very little air demand:
Check if the E-09 /OL2 error is displayed when there is no need for compressed air or the compressed air required is less than the minimum the compressor can produce, for example during lunch breaks, shift changes, at the end of the day or just before or about to start a shift where there is no need for air until the operation begins.
| Reason | Solution |
|---|---|
| Input voltages are below allowed limits | Measure phase-to-phase voltages (for three-phase connections). Ensure all input voltages are within acceptable limits |
| Solenoid valve/discharge valve fault. Refer to Discharge Valve/Regulator Working Principle (if applicable) | Check and repair or replace ; solenoid valve, regulator, and/or adjust the regulator as explained in the “subject” section: https://kb.usaircompressor.com/1/fr/topic/discharge-valve-working-principle to prevent the pressure from increasing by more than 0 .5 bar (8PSI) above PSET. |
| PSET, required outlet pressure is increased above 130PSI | Increase the Min. Frequency of the compressor. If electric motor nameplate frequency is 50HZ or 60Hz and Electric motor RPM is 1400RPM to 1500RPM set the Min frequency to 50.00HZ otherwise set the min Frequency to half of the frequency of the Electric motor nameplate frequency. |
E-09/OL2 The error appears almost immediately after the compressor starts while there is no pressure in the compressor and the system:
| Reason | Solution |
|---|---|
| Input voltages are below allowed limits | Measure phase-to-phase voltages . Ensure all input voltages are within acceptable limits . |
| The compressor air outlet is blocked or there is not enough air storage (tank) after the compressor, causing the pressure at the compressor outlet to rise too quickly. |
|
| Electric motor is burned or the motor bearing(s) are defective | Replace the motor if it is burned and/or the motor bearings if they are defective. |
| Airend seized | Try to turn the coupling by hand (Ensure that the power is completely cut off from the main circuit breaker and that it there are no lights on the compressor display to avoid any possible danger). The coupling should rotate freely when there is no pressure in the compressor. If it does not turn at all, replace the air outlet or motor. Separate the motor from the air outlet and check motor or airend is seized. |
| The inverter is faulty | If all of the above are checked so that none of them are causing the problem, measure the DC voltage on the inverter when testing the compressor in operation. If the measured DC voltage is less than 1.3 times the AC input voltage, change the inverter after consulting Us Air Compressor |
Last modified:
2 October 2023
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