When a lubrication cycle is commanded, the solenoid applies air pressure to the grease reservoir for 3 seconds (specified in Parameter 2027), which forces the grease to move up the grease pick-up tube  and into the grease manifold. The grease flows through the lubrication lines to the lubrication points where it gets pushed through the restrictors into the components that require the lubrication (ballscrew, linear guides pads, etc). Once the cycle ends, the pressure from the grease reservoir is vented to the atmosphere, the check valve  traps the pressurized grease in the manifold and the grease will start to flow through the snubber and the check valve  back to the grease canister until the pressure in the manifold drops to 0 PSI.
During the lubrication cycle the control monitors the pressure in the lubrication manifold in order to detect a failure of the lubrication system.
When the solenoid is commanded to turn on, the control begins to monitor the status of the pressure switch . The switch is expected to close within 3 seconds (specified in Parameter 1374) from the moment that the solenoid was commanded ON. Once the pressure is detected it is expected to stay for at least 15 seconds (specified in Parameter 1375). If all of the above statements were satisfied during the cycle then the lubrication cycle is considered successful.
If pressure in the system was not detected within 3 seconds (specified in the Parameter 1374) the control will stop monitoring the pressure and display the “Low Lube” warning icon until the next lube cycle. If such a condition was detected for 5 consecutive lube cycles, then the control will generate the Alarm 2073 AXIS LUBRICATION PRESSURE NOT DETECTED. The alarm will not be generated during a program execution, it will only be generated after the program execution ends or after pressing a [RESET] button.
If the pressure in the system drops below 4 PSI before 15 seconds (specified in Parameter 1375), the control will display “Low Lube” warning icon until the next lube cycle. If such a condition is detected for the next 4 consecutive lube cycles (5 total cycles) the control will generate the Alarm 2075 AXIS LUBRICATION RESERVOIR IS EMPTY. The alarm will not be generated during a program execution. It will be generated after the program execution ends or after pressing a [RESET] button.