The possible Alarm messages are as follows.
CHECK INLET CONTROL- This will occur if the machine is unloaded and the inlet vacuum is less than 3 psig (.2 bar).
CHECK INLET CTRL SYS 1 (2) - This will occur if the inlet butterfly valve fails to open or close properly. A 1 means the inlet valve failed to closer properly. A 2 means the inlet valve failed to open properly.
CHECK MOTOR ROTATION- This will occur if the machine is started and the compressor has incorrect rotation.
CONTROL POWER LOSS- This will occur if the controller detects a loss of the 110 VAC or 120 VAC control power.
EMERGENCY STOP- This will occur if the Emergency Stop button is engaged. The button must be disengaged before the alarm can be cleared.
FAN MOTOR OVERLOAD- This will occur if a fan motor overload is sensed.
HIGH AIREND DISCH TEMP- This will occur if the airend discharge temperature is greater than 228°F (109°C).
LOW SUMP AIR PRESSURE- This will occur if the machine is running fully loaded and the sump pressure drops below 20 psig (1.4 bar).
LOW UNLOAD SUMP PRESS- This will occur if the machine is running unloaded and the sump pressure is less than 15 psig (1.0 bar) for 15 seconds.
MAIN MOTOR OVERLOAD- This will occur if a drive motor overload is sensed.
CHECK SET POINTS- This will occur if the controller has determined some of the data stored in memory contains unacceptable values. When this occurs, the sensors should be calibrated and all the set points checked. It is normal for this alarm to occur after changing controller software.
REMOTE START FAILURE- This will occur if the Remote Start button is pressed after the machine is running or if the Remote Start button remains closed.
REMOTE STOP FAILURE- This will occur if the Remote Stop button remains open and either Start button is pressed.
SENSOR FAILURE 1AVPT (or 3APT, 4APT, 5CPT,2CTT, 2ATT, 3CTT) - This will occur if a sensor is recognized as missing or broken. This does not apply to sensor 4ATT.
STARTER FAULT 1SL (2SL)- This will occur if the starter contacts open while the machine is running. It will also occur if the machine is given the stop command and the starter contacts do not open. 1SL refers to the auxiliary circuit on starter contact 1M. 2SL refers to the auxiliary circuit on starter contacts 2M and 1S.
STEPPER LIMIT SWITCH- This will occur if both limit switches are activated at the same time.
INVALID CALIBRATION- This will occur during the calibration process if the sensor reads greater than 20% of scale.
LOW COOLANT PRESSURE- This will occur if the compressor is running and the following conditions are met. The coolant must be less than 1 psi and either the sump pressure is greater than 10 psi or the inlet vacuum is less than 12 psi.
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