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12.5 SAFETY ON THE PRESENCE OF PHASE VOLTAGE WHEN THE STEERING
MOTOR IS AT REST
The microprrocessor logic continuously tests the phase voltage amplifiers output at rest
and if they are other than 2.5Vdc±0.25Vdc, causes an alarm. These voltage are
measured between D47 and D48 anodes and gnd (see Fig 11.1.6.2).
12.6 SAFETY ON POT WIRES BROKEN (FOR AUTOMATIC CENTERING
OPERATION)
The safety on pot broken operates by looking for either higher than 4.7Vdc or less than
0.3Vdc on the wiper pin of the steer angle feedback pot. In fact, the 5K pot is connected
with two resistances that confine its center point inside the two limits specified above if
the pot is correctly connected (see Fig 11.1.3.1).
12.7 CROSS DIAGNOSIS BETWEEN MASTER AND SUPERVISOR
MICROCONTROLLER
Each microcontroller independently reads the command input (tacho-generator or pot)
and calculates a consequent controlling action. While the action generated by the
Master becomes the executive, the supervisor's is just for a matching comparision. As
each microcontroller receives both its own and the other microcontroller's value, if they
are mismatched each microcontroller may open its own alarm switch.
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