CHAPTER 6: SETPOINTS
S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–119
Referring to the Logic Element logic diagram below, the Logic Element can be set to one of
four functions:
Control
,
Alarm
,
Latched Alarm
, or
Trip
. When
Alarm
or
Latched Alarm
is
selected, the output relay #1 (Trip) is not triggered during Logic Element operation. The Trip
output relay will be triggered when
Trip
is selected as the function, and the Logic Element
operates. The Logic Element function can be also selected as
Control
, and used with other
relay elements without turning on the “ALARM” and “TRIP” LEDs.
The “PICKUP” LED will turn on upon a Logic Element pickup condition except when the
Logic Element function is selected as
Control
.
The “ALARM” LED will turn on upon Logic Element operation if the Logic Element function
selected is either
Alarm
, or
Latched Alarm
.
The “TRIP” LED will turn on upon Logic Element operation if the Logic Element function is
selected as
Trip
.
The option to trigger auxiliary output relays is provided for any of the selected Logic
Element functions.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to
Chapter 3 - Working with the Keypad
.
PATH
:
SETPOINTS > S4 CONTROLS > S4 LOGIC ELEMENTS
LE1(16) FUNCTION
Range: Disabled, Control, Alarm, Latched Alarm, Trip
Default: Disabled
This setting defines the use of the Logic Element. When
Trip
is selected as a function, the
Logic Element will trigger Output Relay # 1 (Trip) upon operation.
LE1(16) ASSERTED
Range: On, Off
Default: Off
This setting defines the Logic Element state “On” or “Off” to be used as an output. The
asserted “On” selection provides an output “high” when the LE is "On". If asserted “Off” is
selected, then the LE output will be “high”, when the LE is “Off”.
TRIGGER SOURCE 1, 2, 3
Range: Off, Any input from the list of inputs
Default: Off
Each of the three trigger sources is configurable by allowing the assigning of an input
selected from a list of inputs. This input can be a contact input, a virtual input, a remote
input, or an output flag from a protection, or control element. See the list of available
inputs from the table below.
TRIGGER LOGIC
Range: OR, AND
Default: OR
This setting defines trigger source operation as either “OR” or “AND”. When set to “OR”
any of the inputs will trigger the Logic Element. When set to “AND” all three sources must
be asserted before the Logic Element is triggered.
PKP TIME DELAY
Range: 0 to 60000 ms in steps of 1 ms
Default: 0 ms
This setting specifies the pickup time delay before Logic Element operation.
DPO TIME DELAY
Range: 0 to 60000 ms in steps of 1 ms
Default: 0 ms
This setting specifies the time delay from a reset timer that starts upon expiry of the
pickup time delay and prolongs the operation of the Logic Element until this time expires.
