Troubleshooting
5-76 Manual # 42-02-2P24
TC-MPI Board
The Motion Processor Interface board provides serial and discrete interface to selected AC or
DC drives. Redundant safety processors are also on this board as well as the connection points
for seismic and earthquake devices and for an emergency brake/rope gripper if one is used.
There are three, independent safety processors. Working in conjunction with position and
speed feedback sensors, and continuously monitoring one another, the three prevent the eleva-
tor from starting or bring it to an emergency stop if position/speed related errors are detected.
• SPA (Safety Processor A): Working in conjunction with the PS1 positioning sensor (one of
two positioning sensors on the cartop), SPA performs Emergency Terminal Switch func-
tions and continuously monitors position and speed data from its sensor as well as contin-
uously comparing this data with data reported to SPB.
• SPB (Safety Processor B): Working in conjunction with the PS2 positioning sensor (one of
two sensors on the cartop), SPB performs Normal Terminal Switch functions and moni-
tors PS2 position and speed data, continuously comparing this with data reported to SPA.
• MP (Motion Processor): Primary functions are drive and speed control. Additionally,
monitors speed and direction from motor rotation and from PS1 positioning sensor. The
MP checks that both SPA/PS1 and SPB/PS2 systems are functioning properly by compar-
ing their data and ensuring that any discrepancy is within a fixed tolerance. Using PS1
data, the MP is also able to perform redundant checking of the ETS function.
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