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Some Lube Faults are generated during periods of high ambient temperatures. Minster presses equipped with a Monitor Flow Lubrication System provide protection for broken lines, as well as plugged oil lines. This provides the most complete monitoring system for lubrication faults. With this system, the viscosity of the oil is important to maintain proper lubrication for press protection.
When the ambient temperature approaches 95 degrees Fahrenheit, the viscosity of the oil changes which may be sensed by the Monitor Flow unit. This is identified as a "Sump Fault" on the unit. This fault is caused by the drop in viscosity of the oil. More oil is flowing through the orifices and less is being returned by the sump line. The Monitor Flow Lube System will sense the reduction of oil returning to the sump and produce the "Sump Fault". Sump return is affected by the reduction in pressure via a viscosity change. There is a 65 PSI check valve and flow switch in the sump return. If the check valve is not cracked, at 65 PSI or higher the flow switch will fault. This is also how a broken line is detected.
For those presses that have hydrostatic gibs, the lower viscosity oil causes a drop in system pressure. This drop in pressure is sensed by the system pressure switch and a fault is indicated.
E2 and P2 Presses
To troubleshoot a "Sump Fault" on E2 and P2 presses, perform the following checks:
- Check for proper oil level in reservoir.
- Check that oil filters are not plugged.
- Check for broken oil lines.
- Check to see that pump is not sucking air. This can be checked by checking for air bubbles in the clear oil lines.
If none of the above problems have been found:
- Check the lube system pressure. The normal range for E2 and P2 presses is between 80 PSI and 120 PSI.
If the pressure is 70 PSI or below:
- Check the type and viscosity of oil in the press.
Note: Normally Minster Lube #1 is specified for use in these press types. If Minster Lube #1 is currently in the press, consider switching to Minster Lube #9 if the ambient temperature is expected to remain high.
These specifications can be found in the press operating manual. In the older manuals, there was no #9 lube specification listed. It was listed with the #1 lube specification.
Minster Lube #9 can be used year round if the plant ambient temperature does not drop below 70 degrees Fahrenheit.
When the plant's ambient temperature drops below the 70 degrees Fahrenheit range, the oil should be changed back to Minster #1 because the viscosity of Minster #9 is too high for lower temperature. Operating E2 and P2 presses with Minster #9 oil at low temperatures will result in extremely high pressures and reduced oil flow through orifices, causing possible indicated lube faults at the bearings.
If the system pressure is in the correct range:
Check for possible problems with the flow switches or monitoring system. Refer to the Monitorflow Lubrication Manual provided with the press.
PM2 and PM3 Presses
For troubleshooting a "Low Lube Pressure Fault" on PM2 and PM3 presses, click here. | 
