Keying Input Logic - Ametek UPLC-II System Manual

(RJ-45) and serial port (DB9 connector) to connect
a pc to allow settings, etc through web pages.
Also on the front panel are four blue indicator lights
that indicate if the main and optional redundant
power supplies and power amplifiers are on.
Each printed circuit board that comprises the
UPLC-II™ has a green status LED associated with
it. The power supplies and power amplifiers have
an LED on the front edge of the printed circuit
board that is visible with the front cover down. The
Transceiver and Input/Output board have LEDs that
are located on the front panel display board, visible
with the front cover down. The Ethernet board has
green and yellow indicating lights visible from the
rear of the unit. If any of these lights are not illumi-
nated, it indicates a problem with that board. There
are also 4-character alarm indications on the front
panel display when an alarm occurs.
In addition to the standard testing from the front
panel, there is also available as a purchased option,
integrated testing facilities. When used as an
ON/OFF PLC, the channel status is not known until
called upon to perform its operation, so therefore
could have failed without warning. The UPLC-II™
has an option for performing automatic checkback
tests. Please see chapter 6 for details. When used as
an FSK, sometimes it is desired to perform a "shift
to trip" test from end to end. The trip test feature is
available when purchased. Please see chapter 6 for
details.
Network protocols are available to allow device-to-
device communications. These include DNP3.0 and
IEC61850. Please see chapter 7.

2.5.1 Keying Input Logic

Depending upon the channel type and function set,
different keying logic is selected. Following are
tables, which describe the functionality of the key-
ing logic for each channel type and function combi-
nation.
January 2016
Chapter 2. Product Description
ON/OFF Channels
ON/OFF channels typically are not keyed normally
and are keyed on to block tripping for an external
fault. A choice is made to give priority to either the
stop input or the start input should they both be
present at the same time. Typical Directional
Comparison and Phase Comparison relaying sys-
tems utilize a stop priority; giving the relay system
priority to trip vs to not trip, thereby making the
system dependable.
Table 2–12 applies to the majority of modern relay
systems in service that use the ON/OFF type of
PLC channels.
Relay Systems that use the older-style electro-
mechanical relays such as ABB/Westinghouse's
KA-4/KD-10 series of relays have one lead that
serves the function of both start and stop. Table 2–
13 would apply in this situation. Please see chapter
3 for details on how to connect this type of system.
The "common start/stop input" box must be
checked in order for this table to be applied.
FSK Channels
FSK channel functions are used for Direct Transfer
Tripping Systems or Line Relay Systems. If the
DTT/POTT or the Unblocking-2 F selection is set
for the function, then Table 2–14 will apply. When
the FSK 3-frequency channel is used for both a
DTT and Line relaying channel, Table 2–15 will
apply. If both the DTT Key and LR key are present,
the DTT key will have precedence. If using the FSK
channel for Phase Comparison Relaying systems,
Table 2–16 will apply. If using the FSK channel for
2 protection channels A & B, where both channels
are allowed to trip simultaneously with a fourth fre-
quency shift (unlike the 3-frequency), then Table 2-
17 applies.
2
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