Model 350AH1A
30
Rev B
3.5.4.2
AC Interlock
For interlock applications that are more safety critical, where logic circuits are not trusted, the
AC interlock
can be used to disconnect the amplifier from the AC mains. This interlock circuit is connected directly in
series with the AC relay circuit. There are no logic circuits or transistors in this signal path. Rear panel
Interlock connector Pins 10 and 14 are for this purpose. Pin 10 must be brought low to energize K1, Pin 14
goes low when the power switch is activated. Opening the AC interlock connection will disconnect AC
primary power to all major circuits and display
AC INT
on the front panel.
The fault conditions can be reset by pressing the
RESET
switch on the front panel (when the Keylock Switch
is set to
LOCAL
) or by a command sent from the user’s computer (when the Keylock Switch is set to
REMOTE
). Either of these conditions causes the amplifier to return to normal conditions, when the RF ON
command can be asserted. The forcing of the RF ON command 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 amplifier 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.
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