Harris ATLAS ANALOGUE, Руководство пользователя

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7/26/05 888-2523-001 4-13
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
ATLAS Analogue
transmitter will be shut off. If the external interlock is not going to be used, all 6
jumpers must be installed, effectively connecting J18-1 to ground to allow the
transmitter to turn on.
The External Interlock circuit uses relay K1 to directly drive the parallel control lines
on the System Control Bus. If an interlock circuit is opened, relay K1 will relax to the
position shown on the schematic. This will apply an RF Mute, PS Mute and most
importantly Fault OFF. The transmitter is now shut off and cannot be turned on again
until the external interlock circuit is closed and a new ON command is given locally or
by remote.
4.3.6.2 RF Mute Interlock
There are 2 more interlock connections on J18 which can be used to apply an RF Mute;
instead of a Fault OFF condition as discussed above. These are:
•
J18-9 to J18-10
•
J18-11 to J18-12
!
CAUTION:
THESE INTERLOCK CONNECTIONS ARE NOT TO BE USED IN ANY SITUATION
WHERE PROTECTION OF PERSONNEL IS AN ISSUE.
While this interlock can be used for any purpose where it is desired to mute the RF
temporarily, the primary purpose is for use on a flow switch of a water cooled resistive
load.
When the transmitter is first turned on there is little or no coolant flow. If the flow
switch is interlocked to the Fault OFF interlock (J18, 1-8), the transmitter cannot be
turned on. However, by connecting the flow switch to the RF Mute interlock, only the
RF output is held off until the coolant flow is present.
The RF Mute interlock can also be used for RF switch changeover or a dummy load
thermal interlock.