Hardware Interface
745
Transformer Management Relay
Inter
faces
http://www.GEindustrial.com/multilin
4–5
GE Multilin
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 char-
acter is entered, by pressing the
ENTER
key, it is automatically saved in Flash
Memory, as a new setpoint.
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.
Setpoint Entry
To store any setpoints, terminals C1 and C2 (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 values. A passcode of “0” effectively turns off the passcode feature - in this
case only the access jumper is required for changing setpoints. If no key is pressed
for 5 minutes, access to setpoint values will be restricted until the passcode is
entered again. To prevent setpoint access before the 5 minutes expires, the unit
may be turned off and back on, the access jumper may be removed, or the
SETPOINT
ACCESS
setpoint may be changed to “Restricted”. The passcode cannot be entered
until terminals C1 and C2 (access terminals) are shorted. When setpoint access is
allowed, the Setpoint Access LED indicator on the front of the 745 will be lit.
Setpoint changes take effect immediately, even when transformer is running.
However, changing setpoints while the transformer is running is not recommended
as any mistake may cause a nuisance trip.
The following procedure may be used to access and alter setpoints. This specific
example refers to entering a valid passcode to allow access to setpoints if the
passcode was “745”.
1. Press the
MENU
key to access the header of each menu, which will be displayed
in the following sequence:
2. Press the
MENU
key until the display shows the header of the setpoints menu,
then press the
MESSAGE
#
or
ENTER
key to display the header for the first set-
points page. The set point pages are numbered, have an 'S' prefix for easy iden-
tification and have a name which gives a general idea of the settings available in
that page. Pressing the
MESSAGE
%
or
MESSAGE
&
keys will scroll through all the
available setpoint page headers. Setpoint page headers look as follows:
3. To enter a given setpoints page, press the
MESSAGE
#
or
ENTER
key. Press the
MESSAGE
%
or
MESSAGE
&
keys to scroll through sub-page headers until the
required message is reached. The end of a page is indicated by the message
END OF PAGE
. The beginning of a page is indicated by the message
TOP OF
PAGE
.
INPUT 1 NAME:
Tx. Monitor
SETPOINTS
[
!
]
ACTUAL VALUES
[
!
]
TARGET MESSAGES
[
!
]
!
SETPOINTS
[
!
]
S1 745 SETUP
Summary of Contents for Multilin 745
Page 2: ......
