Page 24 - Air-Lakeside FSR PM

"Oil-Less” Medical Air Medical Systems

3.0 System Operation (continued)

3.6 Emergency Shutdown / Alarms

The following conditions may arise during operation.

High Air Temperature Shutdown - This will shut down the compressor in question and will not re-start until
the appropriate red push button is pressed on the main control panel. Before allowing the unit to re-start, the
condition should be checked (see “Compressor runs hot” in the Troubleshooting Section 4.0). Even after
pushing the button, the unit may not re-start, depending on system sequencing and system pressure.

Motor Overload Shutdown - This will shut down the compressor in question and will not re-start until the
reset button on the starter inside the main control cabinet is reset. See “Motor overheating” in the
Troubleshooting Section 4.0.

Lag Unit Running Alarm - This alarm will activate if the last available compressor unit comes on. In the
case of a duplex system, it will activate when the second compressor turns on or the lag pressure switch (PS-2)
opens. In the case of a multiplex system, the lag alarm will activate when the last available unit is required to
come on. For example, in a quadruplex system, if all four (4) H-O-A switches are set to “Auto”, then the lag
alarm will trigger when the fourth unit comes on. If on the same system, three (3) of the four (4) H-O-A
switches are set to “Auto” and the other to “Off” or “Hand”, then the lag alarm will activate when the third
unit comes on. To silence the alarm, press the amber push button. In the event the lag alarm is persistent,
check to see if any leaks or valves are open downstream or reduce the system load.

Maintenance Alarm (Optional) - For units with maintenance timers, the PLC program monitors the run time
hours. When the unit reaches the predetermined set point (8000 hours for 1-7.5 HP, 6000 hours for 10-20
HP), the PLC will turn on a blue light to indicate that maintenance is now due on that unit. At that same time,
a remote set of contacts associated with that unit will change condition (refer to the wiring diagram that came
with the unit for terminal numbers). To acknowledge/cancel the maintenance alarm, press the lighted
pushbutton. Once the alarm is canceled, the remote contacts will return to their original condition. The PLC
program will automatically reset the “clock” for the next maintenance alarm, as soon as the previous alarm
times out. This way the maintenance intervals should correspond to predictable readings on the hourmeter.
For example, on a 7.5 HP unit, the maintenance alarm light should occur approximately at 8000-hour
increments (i.e., the first alarm at 8000 hours, the second at 16,000 hours, etc.)

Dryer Tower Switching Failure Alarm (Optional) - For units with this feature, there is one pressure switch
that senses pressure inside each dryer tower for a total of four pressure switches. If the pressure in both towers
of the same dryer fall below 50 psig, the “dryer fault” light will come on and the remote dryer switching
failure contacts will change condition (refer to the wiring diagram that came with the unit for terminal
numbers). A short time delay (1.5 seconds) is started when both pressure switches fall below 50 psig to
eliminate false alarms during normal tower switching. To eliminate alarms during periods when the dryer is
turned “off” for maintenance or other reasons, the dryer tower switching failure alarm is bypassed for that
dryer. Please note there is only one set of remote alarm contacts that will be activated in the event that either
dryer has an alarm condition. Pushing the illuminated pushbutton can reset the dryer fault alarm.

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