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Main/Safety ETS Zone fault
The J22 processor on the Machine Room SRU board has determined the state of the ETS
hoistway switches by scanning inputs 510 and 512. The J21 processor which scans redundant
inputs 509 and 511 reports the switches in a different position.
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 509 through 512 of the Machine Room SRU board. The input pairs
[509,510] and [511,512] should go on and off together as the car passes the UET and DET
hoistway switches.
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” F35-F36 fault.
Main/Safety Gate Switch fault.
The J22 processor on the Cartop SRU board has determined the state of the gate switch by
scanning input 508 (and 515 if car has rear doors). The J21 processor which scans redundant
inputs 507 and 514 reports the switches in a different position.
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 (and 514 and 515 if car has rear doors) of the Cartop
SRU board. The input pairs [507,508] and [514,515] (if rear doors) should go on and off
together as the car doors open and close.
Controller boards may need to be reprogrammed if they contain invalid software.
Cartop 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” F37 or F56 fault.
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