KLYSTRON OVER CURRENT

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

 

 
 
 
 
 

BACKGROUND 

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The beam sampling circuit (see 11-3 sheet 6) provides a beam current sample at A7TP2 that is sent to the Hard Wire Signal Processor via cabinet jack J7.  The beam current sample is also referred to as Cathode Pulse Signal is used with the Receiver Protect ON Command, and Receiver Protect SET/RESET signals to produce the Receiver Protect Command, Which is sent to the receiver to protect the Receiver Front End.  The Klystron beam voltage (BIM) is monitored on transmitter control panel meter A1M4 (E/I meter switch S9 position 11).  A Beam Current Sample (BIS) is sent to Control and Monitoring RMS Interface A3A3 (see 11-7 sheet 10 J35 pins 21 and 1). The name is then changed Twice from BIS to FPABMI-IN and then KLYOC.  KLYOC is feed into a  Amplifier/Comparator (AMP/CMPTR), where it is set toa fault if greater than 105 milliamperes is present.  This fault is placed on the Fault Bus via PORT05EN- as Transmitter Data (TDATA) and via bubble 1004-11 to sheet 11 at 1004 (see 11-7 sheet 11).  A fault at this point will remove Transmitter Available.
 

SIGNAL SOURCE 

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KLYSTRON Over Current fault signal source originate (see figure 11-3 sheet 6), at the Beam Sampling Circuit Block, the signal name is BIS and BIS-R.  Figure 11-3 sheet 6 indicates BIS goes to Figure 11-7 sheet 10.
 
 

SIGNAL DESTINATION 

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(see figure 11-7 sheet 10) BIS and BIS-R passes through J35 pin 21 and 1, the name changes at this point to FPABMI.  FPABMI enters the Transmitter RMS interface board (A3A3) at pins A60 and B60 to a AMP/CMPTR.  If the AMP/CMPTR indicates a fault, information is place on the Fault Bus via PORT05EN- as Transmitter Data (TDATA), it also exit bubble 1004-11 to remove Transmitter Available at 1004 (see figure 11-7 sheet 11).  This fault is follows another path also with signal name of KLYOC-- at A69 where the name is change to KLYOC- at J3 pin 3 to signal bubble 1018-1 (see figure 11-7  sheet 1) Fualt Display Panel A1A1 at 1018 to turn on the Klystron Over Current Fault light.
 

LIMITS AND FAULTS 

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NOMINAL klystron cathode current is 28.0 amperes PEAK.  A klystron cathode current of 22 to 91 milliamperes AVERAGE  can be read on the E/I meter position #11.  The Limit is set for anything greater then 105 milliamperes will cause an alarm.
 

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