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THROTTLE CONTROL SYSTEM The throttle system uses the following configuration:
The PLC includes an analog input and analog output card to control
the throttle systems. The command signal is taken from the levers
and processed by the PLC. The PLC then decides what output to send
to the actuator in accordance with the logic described below. The
touch panel is used as the operator interface for rigging and maintenance
of the system. The
first component is the actual control head mounted on the console.
This control head is used to produce an analog signal into the PLC
for position demand. In addition, it is used to set the mechanical
stop for the idle detent during the test. Either one or two levers are
provided depending upon the engine requirements. The input from the control head is fed in to the PLC. The PLC then calculates all of the logic associated with the task and provides an analog output to the actuator which moves to the appropriate position. The actuator generates an error between the demand and actual positions and sends a discrete back to the PLC if they do not match. If this discrete is received, the manual jog input is used to bypass all of the actuator electronics and force the actuator to cut-off.
The demand positions are transferred to the main data acquisition system via the serial link in engineering units.
Copyright 2002
Yanos Aerospace Inc.
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Alarms
from the Data Acquisition System can also be used to externally
trigger a trip to idle or trip to cut-off. When this happens, the
lever must be returned to a value near minimum in order to reset
the system.