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CHAPTER 6: SETPOINTS
Logic elements
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
The 339 relay has 16 Logic Elements available to build simple logic using the state of any
programmed contact, virtual, or remote input, or from the output operand of a protection,
or control element. Changing the state of any of the assigned inputs used as trigger
sources, will change the state of the Logic Element, unless a blocking input is present. The
logic provides for assigning up to eight triggering inputs in a programmable gate for Logic
Element operation, and up to four blocking inputs in a programmable gate for defining the
block signal. Pickup and dropout timers are available for delaying Logic Element operation
and drop-out respectively. In addition, the user can define whether to use the "ON", or
"OFF" state of the programmed element by selecting ASSERTED: "On" or "Off".
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 > LOGIC ELEMENTS
LE1(16) FUNCTION
Range: Disabled, Control, Alarm, Latched Alarm, Trip
Default: Disabled
For details see
Common
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 INPUTS
Range: 2 to 8
Default: 3
This setting defines the number of trigger sources to be used in the menu of the Logic
Element. Up to eight trigger sources (inputs) can be selected.
TRIGGER SOURCE 1 (8)
Range: Off, Any input from the list of inputs
Default: Off
Each of the 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.
setpoints.
S4 CONTROLS
6–119
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