VSV Actuator and Sensor Location (Right Side Shown)
Figure 001
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VSV Actuator and Sensor Location (Left Side Shown)
Figure 002
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VSV Actuator System
Figure 003
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4. Variable Stator Vane Actuator_____________________________
A. General The variable stator vane (VSV) actuator provides an output force and motion to the variable stator system in response to fuel pressures from the hydromechanical unit. The VSV actuators are mounted on the high pressure compressor stator case at the 2 and 8 o'clock positions.
B. Description (Ref. Fig. 004, 005) The VSV actuator is a single ended, uncushioned hydraulic cylinder capable of applying force in both extend and retract directions using high pressure fuel. The fuel to air rod seal is a dual-stage seal with a drain port to carry away fuel which passes the first stage of the seal. Piston stroke is controlled by internal stops. The piston incorporates a capped, preformed packing to prevent cross piston leakage. A wiper is provided to ensure that the piston rod is dirt free as it moves through the dual-stage seal. Each actuator contains one independent linear variable differential transformer (LVDT) for position indication. Each LVDT consists of three windings : one excitation and two secondary. The movable winding translates with the actuator rod and the resulting voltage is a function of actuator stroke/VSV position. Excitation is provided by the electronic control unit.
C. Operation The VSV actuator drives the VSV linkage assembly to the stator angle calculated by the ECU, through the HMU. The HMU torque motor ports fuel through the rod or head parts respectively to close or open the vanes or hold their position by pressure balancing the actuator piston.
5. VSV Position Feedback Transducer________________________________
A. General (Ref. Fig. 003) The VSV position sensor is a linear variable differential transducer (LVDT). It is contained in the actuator. It is electrically supplied with
7.07 volts, RMS, 3000 hertz by the ECU. The ECU compares the feedback signal to the scheduled value and modulates the control signal sent to HMU torque motor to maintain the VSV actuator position in agreement with the schedule.
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Variable Stator Vane Actuator
Figure 004
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VSV - Section
Figure 005
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B. Description (Ref. Fig. 006) Each LVDT consists of two windings. A movable actuator rod within the LVDT creates a voltage which is a function of actuator stroke/VSV position. Excitation is provided by the electronic control unit.
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LVDT - Schematic
Figure 006
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E 56-5B E E E VARIABLE STATOR VANE ACTUATOR AND SENSOR (LVDT) - REMOVAL/INSTALLATION
______________________________________________________________________
TASK 75-32-10-000-002
Removal of the Variable Stator Vane (VSV) Actuators
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
No specific blanking plugs
R No specific circuit breaker(s) safety clip(s) No specific container 1 USgal (4 l) No specific soft-jawed pliers No specific warning notice No specific access platform 1 m (3 ft. 3 in.) 856A1084 1 CART - STATOR ACTUATOR 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM AIR 空气(64)
