Model 5000A225A
46
Rev B
inhibit interlock has been opened, the Driver returns to the Standby (RF Off) condition, forcing the re-
assertion of the Operate (RF On) command returns the unit to normal operation.
3.5.5.2
AC Interlock
For interlock applications where it is desired to disconnect the AC power source from the main power
supplies, the AC interlock can be used to disconnect the amplifier from the AC mains. This interlock circuit is
connected directly in series with the relay coils K1 and K2 in the DCU, which actuate the contactors for the
main power supplies in the DCU and MPA. Rear panel Interlock connector Pins 10 and 14 are for this
purpose. Pin 10 provides the activation signal from the control panel P3-2 to the relay coils. Opening the AC
interlock connection will disconnect AC primary power to all major circuits and display
AC Interlock
on the
front panel.
Fault conditions can be reset by pressing the
RESET
button displayed on the Touch Screen located on the
front panel or by sending the RESET remote command from the user’s computer (when the Keylock Switch
is set to
REMOTE
). Either of these conditions causes the 5000A225A’s DCU to return to normal conditions.
Forcing the user to reassert the Operate command (RF On) after a fault or interlock condition is a safety
feature that prevents an unexpected burst of RF when the fault or interlock condition has been restored. Fault
conditions that require the MPA to be disconnected from the AC mains will be reset automatically upon re-
energizing the amplifier. Only fault conditions that continue to be valid will be displayed after the AC mains
have been disconnect via the circuit breaker or external disconnection.
3.5.6
System Error (F/O Link Fault)
The fiber-optic serial link must be established before the amplifier system can go to an RF On state. This link
is established immediately upon power on of the driver box. It is for this reason that all sub-amplifier
breakers must be powered on before the driver rack is powered on. If the link fails to be established with all
MPA’s, a fault condition is generated. The LED’s on the rear of each MPA can be used to determine where
the link is broken.
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