3BSE050090R20控制器,PFEA111-20使用指導(dǎo)
線性可變差動變壓器（LVDT）測量執(zhí)行器位置。HSS模塊提供400到15000個
赫茲勵磁電壓（通過功能代碼55選擇）至LVDT主要。LVDT頻率規(guī)范中的零功能代碼55的啟用直流的勵磁電壓LVDT。HSS模塊上的DIP開關(guān)選擇勵磁電壓幅值范圍從1.08伏峰值到9.0伏
LVDT二次側(cè)產(chǎn)生與液壓執(zhí)行器位置成比例的差動電壓。
3BSE050090R20控制器HSS模塊將差分電壓轉(zhuǎn)換為數(shù)字?jǐn)?shù)據(jù)并發(fā)送至MFP模塊。使用MFP模塊存儲的數(shù)據(jù)（在閥門校準(zhǔn)期間）在其配置規(guī)范中（S18至S21），它將LVDT二次差分電壓轉(zhuǎn)換為執(zhí)行器位置反饋。HSS模塊進(jìn)行自檢，并在出現(xiàn)故障時通知MFP模塊。如果HSS模塊與MFP的通信故障，則HSS模塊啟動對渦輪節(jié)流閥的手動控制模塊發(fā)生（或MFP模塊進(jìn)入配置模式）。HSS模塊提供用戶難以接受的輸入連接至24 VDC電源的電線。用戶指示HSS模塊通過外部輸入（推力、觸點(diǎn)等）提升或降低致動器。此外，HSS模塊上的跳閘偏置電路如有必要，將燃油節(jié)流閥驅(qū)動至關(guān)閉位置。
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.
