Keying Logic - Ametek UPLC CU44-VER04 Applications Manual

UPLC™ Application Manual
that includes a plug for a handset and a call button
to initiate the call. An audible alarm is also on the
front panel display board.
Each printed circuit board that comprises the
UPLC™ 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. For these alarm indications, please
refer to the installation manual supplied with the
unit.
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™
has an option for performing automatic checkback
tests. Please see the installation guide 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 8 for details.
Table 2–1. Channel Type: On-Off, function: Directional or Phase Comparison Relaying with Stop Priority
START STOP
Not Activated Not Activated
Not Activated Not Activated
Not Activated Activated
Not Activated Activated
Activated Not Activated
Activated Not Activated
Activated Activated
Activated Activated
Page 2–6
Network protocols will also be available in the
future to allow device-to-device communications.
These include but may not be limited to DNP3.0
and IEC61850. Please contact the factory for fur-
ther details.

2.4.1 Keying 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.
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
the ability to trip over not trip, thereby making the
system dependable.
Table 2–1 applies to the majority of modern relay
systems in service that use the ON-OFF type of
PLC channels.
Some unusual systems may require that start has
priority. For these systems, Table 2–2 would apply.
LL KEY TRANS. OUTPUT CONDITION FOR THIS KEYING
Not Activated
Activated
Not Activated
Activated
Not Activated
Activated
Not Activated
Activated
INPUT STATE
Transmitter off
Send Low Output Power
Transmitter off
Transmitter off
Send High Output Power
Send High Output Power
Transmitter off
Transmitter off