GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 40

4.1 HARDWARE INTERFACE
b) ACTUAL KEY
Measured values and collected data messages are arranged into groups of related messages called actual values pages.
Each time is pressed, the display advances to the first message of the next actual values page. Pressing
ACTUAL
while in the middle of an actual values page advances the display to the beginning of the next page. Pressing
in the middle of a setpoints page returns the display to the last actual values message viewed. If the display has timed out
to the default messages, pressing
keys move between messages within a page.
MESSAGE
c) ESCAPE KEY
The key is context-sensitive. The response depends on the message displayed and the relay status. If a value is
ESCAPE
edited incorrectly during programming, pressing
tions, moves the display to the next higher header message. This continues until the current sub-header is reached.
ESCAPE
d) ENTER KEY
The context-sensitive
sub-header whose lower line reads
upper line. After editing setpoints numerically or with
Setpoint access must be allowed for this operation to succeed. The current message can also be made a default message
4
by pressing the key sequence: [ . ]
e) MESSAGE UP/DOWN KEYS
The /
MESSAGE MESSAGE
while scrolls downward through the list.
MESSAGE
f) VALUE UP/DOWN KEYS
Setpoint values are entered using
using the number keys and multiple choice selections with
response, pressing
VALUE
or
VALUE VALUE
increment. When the maximum value is reached, setpoint selection continues from the minimum value. Each time
is pressed, the value decreases by its step increment. When the minimum value is reached, setpoint selection
VALUE
continues from the maximum value. Press and hold the value keys down to rapidly change values.
g) NUMBER KEYS
Number keys are used for direct entry of numeric setpoint values. Thus, enter 27.3 as
play between the corresponding number and a hyphen.
h) HELP KEY
Press to display a sequence of context-sensitive help messages that automatically advance every few seconds.
HELP
After the last message is displayed, the screen returns to the originally displayed message. Press
sequence to immediately display the next message. Any other key returns to the normally displayed message.
i) RESET KEY
This key is operational when the 745 is in local mode. In local mode,
state and clears latched targets if initiating conditions are no longer present.
j) NEXT KEY
If a target becomes active, a diagnostic message overrides the displayed message and the Message LED flashes. If there
is more than one target active,
played messages. While viewing the normally displayed messages, the Message LED continues to flash if any diagnostic
message is active. To return to the diagnostic messages from the normally displayed messages, press the
Note that diagnostic messages for self-resetting targets disappear with the condition, but diagnostic messages for latched
targets remain until they are cleared. When no targets are active,
mately 5 seconds.
4-4
Courtesy of NationalSwitchgear.com
returns the display to the last viewed actual values message. The
ACTUAL
ESCAPE
key response depends on the displayed message and the relay status. While displaying a
ENTER
[ENTER] for more
.
ENTER ENTER
keys move through messages within a page.
/
VALUE VALUE
or toggles the value between yes and no. For multiple choice selections, pressing
VALUE
displays the next choice. For numeric setpoints, pressing
scrolls through the messages. Pressing any other key returns to the normally dis-
NEXT
745 Transformer Management Relay
before restores the original setpoint value. In other situa-
ENTER
, press to enter the group of messages associated with the
ENTER
/ , press
VALUE VALUE
scrolls upward through a list of messages
MESSAGE
or the numeric keys. It is generally easier to enter numeric values
/
VALUE VALUE
VALUE
puts all latched relays to the non-operated
RESET
illuminates all front panel indicators for approxi-
NEXT
4 HUMAN INTERFACES
ACTUAL
MESSAGE
to store a new value in memory.
ENTER
. When a setpoint calls for a yes/no
increases the value by its step
. Each key toggles the dis-
2, 7, . , 3
during the
HELP
NEXT
GE Multilin
ACTUAL
while
/
key.