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Main/Safety Machine Room Mode fault.
The J22 processor on the Machine Room SRU board has detected that input 508 is not
powered. This indicates that the controller should be either on Inspection or Construction
mode. This fault occurs if the J21 processor reports a different operation mode.
If a software upgrade has been performed recently then it is possible that one of the SRU
boards was mis-programmed.
Verify the wiring on inputs 507 and 508 of the Machine Room SRU board. These inputs should
go on and off together as the Machine Room Inspection Enable switch is toggled.
Controller boards may need to be reprogrammed if they contain invalid software.
Machine Room SRU board may need to be replaced.
“MS” faults are often caused by a fast power glitch on an input rather than longer glitches
which will cause a “Rdn” F30 fault.
Main/Safety Hall Locks fault.
The J22 processor on the Machine Room SRU board has determined the state of the hall door
locks by scanning inputs 502, 504, and 506. The J21 processor which scans redundant inputs
501, 503, and 505 reports the hall door locks in a different state.
If a software upgrade has been performed recently then it is possible that one of the SRU
boards was mis-programmed.
Verify the wiring on inputs 501 through 506 of the Machine Room SRU board. These input
pairs [501,502], [503,504], and [505,506] should go on and off together as the bottom, middle,
and top hall locks open and close.
Controller boards may need to be reprogrammed if they contain invalid software.
Machine Room SRU board may need to be replaced.
“MS” faults are often caused by a fast power glitch on an input rather than a longer glitch
which will cause a “Rdn” F39-F41 fault.
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