POST CHARGE REGULATOR

• BACKGROUND
• SIGNAL SOURCE
• SIGNAL DESTINATION
• LIMITS AND FAULTS

 

 
 
 

BACKGROUND


---


Post Charge Regulator A8 (see figure 11-5 sheet 7) regulates the PFN charge voltage to within 0.01 percent of the desired operating point until the PFN is discharged.  The Post Charge Regulator current sample and Post Charge Regulator maintenance fault indication signal are sent to Control and Monitoring.  The Post Charge Regulator is connected to the charge side of the PFN.  Series connected resistors A8R1 through A8R4, in parallel with capacitor A8C1, provide a time averaged PFN voltage level to the PFN voltage drain circuit.  When the regulator trigger input logic receives the differential Post Charge Regulator trigger (PSTCHGTR +/-) from the Control and Monitoring function, the reference processor on regulator control A8A1 receives the regulation trigger enable signal.  The reference processor compares the instantaneous PFN sample voltage from R5 with the current regulation level from the drain circuit, derived from time averaged PFN voltage levels, and varies the regulator control signal to the drain circuit.  The regulator control signal is proportional to the difference between the PFN voltage sample and the regulation level.
 

SIGNAL SOURCE


---


The PCHGMNT fault signal (see figure 11-5 sheet 7) is a result of the output of an Overvoltage comparator and an Undervoltage comparator.  These two comparators are monitoring the regulated sample voltage from the PFN Voltage Drain circuit.
 

SIGNAL DESTINATION


---


Signal PCHGMNT enters Control and Monitoring at J29-5 and 25 on the Control Card Rack A3 (see 11-7 sheet 10), where it is routed onto the RMS Interface A3A3.  PCHGMNT is place on the Fault Bus during Port06EN- as Transmitter Data (TDATA) and is further sent on through bubble 1020-1 as PCHGRMNT- to the Fault Display Panel A1A1.  At bubble 1020 on the Fault Display Panel (see figure 11-7 sheet 1), PCHGRMNT- goes out to light the lamp for Maintenance Required Post Charge Regulator.  This fault will not disable the transmitter.
 

LIMITS AND FAULTS


---


Regulator control A8A1 monitors the regulation voltage with overvoltage and unervoltage comparators for voltage variations above 80 percent and below 5 percent of the amplifier saturation level.
 

Main Menu