TECHNICAL NOTE – OPERATION OF MT4400 TWTA
08/10/2004
TN4400-3
MCL, INC.
35 of 36
6.0
SHUT DOWN PROCEDURE
To discontinue operation of a MT4400 TWT amplifier system, the following procedure is
recommended for system shutdown:
1.
Remove the input RF drive to the amplifier system.
2.
Send the Standby Command and verify the HPA is in Standby.
3.
Place the HPA into Filament Off.
NOTE
If the HPA is connected to an M&C system and you wish to keep the HPA
on the bus, do not perform the following steps.
4.
Let HPA remain on (to cool down) until the tube temperature is below 35ºC.
5.
Turn off the Main AC Power switch.
Under extreme emergencies, the operator may totally remove AC input power from the system
by simply switching the Main AC Power circuit breaker to the Off position. This shutdown
procedure is only for emergencies and should not be used under normal circumstances. If
problems occur during the shutdown procedure, refer to TN4400-6 – Technical Note,
Troubleshooting & Customer Service Guide for MT4400.
