The following conditions shall cause a Mill to trip…
- LOS or emergency stop pressed
- Mill and feeder running from remote, oil flame not detected with either feeder speed <30 % or coal flame not detected signifying low coal and no ignition source
- Feeder running from remote and coal and oil flame neither detected assuming flame monitoring system is healthy signifying loss of coal flame without ignition source
- Loading gas pressure very low
- Lub oil pressure very low signifying no lubrication to Mill gear box and bearings
- Both PA fans stopped
- Mill running from remote for >30 secs and PA flow below minimum
- Mill running from remote for >30 secs and Secondary air flow < 45%
- Seal air pressure very low
- MFT or Mill hard relay