KA BAND OUTDOOR TWT AMPLIFIER
5-6
5.6.4 Beam
On
Sequence
Beam on sequence (BONS
)
covers the transition from Standby (beam off) to Transmit (beam on).
During BONS the green Transmit light will flash.
5.6.5 Transmit
State
Transmit is the normal beam-on state (high voltage on, heater reduce off). RF Inhibit may be on or
off.
If a fault occurs, the unit will transition via the BOFS (Beam Off Sequence) to the Fault state. A
successful fault recycle attempt will return amplifier operation to Transmit.
5.6.6 Beam
Off
Sequence
The BOFS (Beam off sequence) describes the transition from Transmit or BONS to any beam-off
state.
5.6.7 Fault
State
If a fault condition is detected, the unit transitions to the Fault state. The fault system is always in
auto recycle mode for most faults , which allows the controller to return the unit to the pre-fault
state after a transient fault (or a series of transient faults).
Three consecutive transient faults will place the unit into “summary fault” mode and a reset
command is required to return to normal operation.
CAUTION!
All Faults should be investigated. Damage can occur if
a Reset is made without corrective action.
5.6.7.1 Auto Fault Recycle Mode Rules
Latch into Fault state (sum fault):
If three faults occur within a 20 second period, the unit latches in the Fault state.
Recycle to prior state:
If fewer than three faults occur within 20 seconds, the system recycles back to the appropriate
operational state.
INSTALLATION AND OPERATION MANUAL
