GE 745 TRANSFORMER MANAGEMENT RELAY, Instruction Manual

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GE Power Management 745 Transformer Management Relay 5-43
5 SETPOINTS 5.5 SETPOINTS S3 LOGIC INPUTS
5
5.5 SETPOINTS S3 LOGIC INPUTS 5.5.1 DESCRIPTION
The 745 has two types of digital inputs: Logic Inputs have physical terminals for connecting to external con-
tacts. Virtual Inputs , on the other hand, although providing the same function as logic inputs, have no physical
external connections: a setpoint defines the state of each in terms of “ON” or “OFF”.
There are 16 of each of logic inputs and virtual inputs. The state (‘asserted’ or ‘not asserted’) of each logic or
virtual input can be used to cause any of a variety of predefined logic functions, such as protection element
blocking, energization detection, etc. In addition, any logic or virtual input can be used as an input in Flex-
Logic™ equations to implement custom schemes.
5.5.2 LOGIC INPUTS
yy
SETPOINTS
yy
S3 LOGIC INPUTS
This message indicates the start of setpoints page
S3 LOGIC INPUTS
. Press
to view the contents of this page or to go to the next page.
y
LOGIC INPUTS
y
[ENTER] for more
This message indicates the start of the LOGIC INPUTS section. To continue
these setpoints, press , or press to go to the next section.
y
LOGIC INPUT 1
y
[ENTER] for more
This message indicates the start of the logic input 1 (2-16) setpoints. To
continue with these setpoints, press
, or press to go to the
next section.
INPUT 1 FUNCTION
Disabled
Range: Disabled / Enabled
Select ‘Enabled’ if this logic input is to be used. Selecting
Disabled
will never
allow this logic input to achieve the ‘Asserted’ (or signaling) state.
INPUT 1 TARGET:
Self-Reset
Range: None / Latched / Self-Reset
Chose None to inhibit the display of the target message when the input is
asserted. Thus an input whose “target type” is None will never disable the
LED self-test feature because cannot generate a displayable target
message.
INPUT 1 NAME:
Logic Input 1
Range: 18 alphanumeric characters
Press to begin editing the name of the logic input. The text may be
changed from
Logic Input 1
one character at a time, using / .
Press to store the edit and advance to the next character position.
INPUT 1 ASSERTED
STATE: Closed
Range: Open / Closed
Select Closed as the input asserted state when connected to a normally open
contact (where the signaling state is closed). Select Open when connected to
a normally closed contact (where the signaling state is open).
M E SSA G E
S ET PO INT
EN T E R
M E SS A G E
E N TE R
M E SSA G E
E N TE R
V AL U E V A LU E
E N TE R