Trip Test Initiation - Ametek UPLC CU44-VER04 Applications Manual

UPLC™ Application Manual
Refer to the timing diagrams at the end of this
chapter.
When a trip test is initiated, the local transmitter
shuts down for 1.5 seconds. The remote end
receiver will see this as a loss of channel. After 1.5
seconds, the local transmitter then keys to the
lower trip frequency for 0.5 second. The remote
end recognizes this as a Trip test command and the
remote receiver will then produce a CHECK-
BACK TRIP1 and shuts down the remote trans-
mitter for 2 seconds. The remote transmitter is
then keyed to the lower trip frequency for 0.5 sec-
ond. This in turn produces a loss of channel and
DTT CHECKBACK TRIP (without a TRIP) at the
local end's receiver. Then the system needs to
check for the UB TRIP function. In a similar way,
the local end will send a UB CHECKBACK TRIP
to the remote and the remote receives and then
returns a UB CHECKBACK TRIP to the local
receiver.

7.8.4 Trip Test Initiation

You initiate a trip test sequence by front panel test-
ing, web page request or asserting the trip test ini-
tiate input (if programmed).
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