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In Rigid mode, the Low RF Relay will indicate that the CHPA's RF output is below the Low RF
Alarm level any time this condition occurs, except during an RF Switch port RF Inhibit
command. The Rigid mode can be thought of as the strictest operation of the Low RF Relay.
In Flexible mode, the Low RF Relay will indicate that the CHPA's RF output is below the Low
RF Alarm level any time this condition occurs during the Transmit state, except during any RF
Inhibit, and during Fault state. The Flexible mode allows the user to operate a switch controller
in Automated Switching mode without triggering waveguide switch action while operating the
CHPA in any normal operating state or issuing RF Inhibit commands. Table 3-2 describes the
two modes in more precise detail.
The Fault relay indicates that the CHPA is in the Fault state—the CHPA features Auto Fault
Recycle capabilities and is capable under some circumstances of cycling back to a normal
operating state. This relay may be reassigned to indicate other conditions. Press the MENU
button until the selection RF TRIP LIMITS is displayed. Press the FUNCTION button until the
selection FAULT RELAY is displayed; use the arrow keys to select one the following:
•
FAULT—Fault state
•
LOW RF—Mimics the action of the Low RF Relay
•
SUMFLT—Mimics the action of the Sum Fault Relay
•
HV ON—Reports the result of the logical equation: (High Voltage On) and (NOT(RF
Inhibit))
•
XMIT—Reports High Voltage ON (See note 6)
The Sum Fault Relay indicates that the CHPA is latched into the Fault state. When the CHPA is
latched into the Fault state, the user must clear the fault source and issue a Reset command to
the CHPA to return it to a normal operating condition.
Table 3-2. Low RF Relay Function
Mode
HTD
Flexible
No LoRF
Rigid
Yes LoRF
Table 3-2 Notes:
1.
Yes LoRF= relay de-energized; pin 1 connected to pin 2, pin 3 disconnected from pin 2.
2.
No LoRF= relay energized; pin 1 disconnected from pin 2, pin 3 connected to pin 2.
3.
If an RF Inhibit is issued from any source except RF Switch Port, Low RF relay=Yes LoRF.
4.
BONS is the Beam On Sequence, the time during which the High Voltage turn-on sequence is performed.
5.
Fault refers to the Fault state. See Chapter 5 for detailed description.
6.
When the amplifier is used in a switching system with switched inputs, the fault relay should be set to "XMIT".
The RF switch system interface is located at connector J5 on the rear panel of the CHPA. J5 is a
15-pin D-type connector with pin assignments as shown in Table 3-3.
D
.01023245 R
.L
OC
EV
Compact HPA Operational State
Standby
BONS
No LoRF
No LoRF
Yes LoRF
Yes LoRF
THIS DOCUMENT IS THE PROPERTY OF COMMUNICATIONS & POWER INDUSTRIES.
REPRODUCTION OR RELEASE WITHOUT EXPRESS PERMISSION IS STRICTLY PROHIBITED
Transmit
(NOTE4)
(NOTE4)
Yes/No LoRF
Yes/No LoRF
CHPA SERIES
Fault
(NOTE5)
Yes LoRF
Yes LoRF
(NOTE3)
3-5
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