3BSE050090R20控制器,PFEA111-20使用指导
线性可变差动变压器（LVDT）测量执行器位置。HSS模块提供400到15000个
赫兹励磁电压（通过功能代码55选择）至LVDT主要。LVDT频率规范中的零功能代码55的启用直流的励磁电压LVDT。HSS模块上的DIP开关选择励磁电压幅值范围从1.08伏峰值到9.0伏
LVDT二次侧产生与液压执行器位置成比例的差动电压。
3BSE050090R20控制器HSS模块将差分电压转换为数字数据并发送至MFP模块。使用MFP模块存储的数据（在阀门校准期间）在其配置规范中（S18至S21），它将LVDT二次差分电压转换为执行器位置反馈。HSS模块进行自检，并在出现故障时通知MFP模块。如果HSS模块与MFP的通信故障，则HSS模块启动对涡轮节流阀的手动控制模块发生（或MFP模块进入配置模式）。HSS模块提供用户难以接受的输入连接至24 VDC电源的电线。用户指示HSS模块通过外部输入（推力、触点等）提升或降低致动器。此外，HSS模块上的跳闸偏置电路如有必要，将燃油节流阀驱动至关闭位置。
A linear variable differential transformer (LVDT) measures
actuator position. The HSS module supplies a 400 to 15,000
hertz excitation voltage (selected through function code 55) to
the LVDT primary. A zero in the LVDT frequency specification
of function code 55 enables an excitation voltage for a DC
LVDT. A dipswitch on the HSS module selects the excitation
voltage amplitude ranging from 1.08 volts peak to 9.0 volts
peak.
The LVDT secondary develops a differential voltage proportional to the position of the hydraulic actuator. The HSS module converts the differential voltage to digital data and sends it
to the MFP module. Using the data the MFP module stores
(during valve calibration) in its configuration specifications
(S18 through S21), it translates the LVDT secondarydifferential voltage into actuator position feedback. The HSS
module is self-checking and notifies the MFP module if a failure occurs.
The HSS module initiates manual control of the turbine throttle valve if an HSS module communication failure with the MFP
module occurs (or the MFP module goes into configuration
mode). The HSS module provides inputs that the user hard
wires to a 24 VDC source. The user directs the HSS module to
raise or lower the actuator through external inputs (pushbuttons, contacts, etc.). Also, a trip bias circuit on the HSS module
drives the fuel throttle valve to the closed position if necessary.
