S Etpoint E Ntry - GE 745 Instruction Manual

CHAPTER 4: INTERFACES
4.1.6.2 Entering alphanumeric text
4.1.7 Setpoint Entry
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
The MESSAGE keys scroll through any active conditions in the relay. Diagnostic messages
are displayed indicating the state of protection and monitoring elements that are picked
up, operating, or latched. When the Message LED is on, there are messages to be viewed
with the MENU key by selecting target messages as described earlier.
Text setpoints have data values that are fixed in length but user-defined in character. They
may be comprised of upper case letters, lower case letters, numerals, and a selection of
special characters. The editing and storing of a text value is accomplished with the use of
the decimal, VALUE, and ENTER keys.
1. Move to message
S3 LOGIC INPUTS
, and scrolling with the VALUE keys, select "Enabled". The relay will display
FUNCTION
the following message:
INPUT 1 FUNCTION:
Enabled
2. Press the MESSAGE DOWN key twice to view the
this user-defined input will be changed in this example from the generic "Logic Input
1" to something more descriptive.
3. If an application is to be using the relay as a transformer monitor, it may be more
informative to rename this input "Tx. Monitor". Press decimal to enter the text editing
mode. The first character will appear underlined as follows:
INPUT 1 NAME:
Logic Input 1
4. Press the VALUE keys until the character "T" is displayed in the first position. Now press
the decimal key to store the character and advance the cursor to the next position.
Change the second character to a "x" in the same manner. Continue entering
characters in this way until all characters of the text "Tx. Monitor" are entered. Note
that a space is selected like a character. If a character is entered incorrectly, press the
decimal key repeatedly until the cursor returns to the position of the error. Re-enter
the character as required. Once complete, press the ENTER key to remove the solid
cursor and view the result. Once a character is entered, by pressing the ENTER key, it is
automatically saved in Flash Memory, as a new setpoint.
INPUT 1 NAME:
Tx. Monitor
5. The 745 does not have '+' or '–' keys. Negative numbers may be entered in one of two
manners.
– Immediately pressing one of the VALUE keys causes the setpoint to scroll through
its range including any negative numbers.
– After entering at least one digit of a numeric setpoint value, pressing the VALUE
keys changes the sign of the value where applicable.
To store any setpoints, terminals D9 and D10 (access terminals) must be shorted (a
keyswitch may be used for security). There is also a setpoint passcode feature that restricts
access to setpoints. The passcode must be entered to allow the changing of setpoint
HARDWARE INTERFACE
LOGIC INPUTS LOGIC INPUT 1
 
INPUT NAME
INPUT 1

setpoint. The name of
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