Console
The console provides the user interface operational control inputs, the metric indicator inform-
ation, and the console-to-base communication interface. The console Upper PCA board
(UPCA
1
) sends the input control commands to the base Lower PCA board (LPCA). The con-
sole also receives error code data from the base which is used to maintain the Error Log ser-
vice menu. The console also controls and sends the ASL
2
status state (based on the received
error codes) to the base.
The LPCA makes use of two main processors: the Master (also referred to interchangeably as
“Major”) and Slave (also as “Minor”).
Base
The base Lower PCA (LPCA
3
) receives machine control commands from the console and dir-
ectly executes the commands to control the braking, lift operation, and power ON/OFF. The
LPCA also monitors error conditions and sends the detected error event code information to
the console.
1
Upper PCA board
2
Active Status Light: Service and maintenance status light.
3
Lower PCA board
Experience Series 800 Line EFX
147
9 Theory of Operation
System Component Overview
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