GE Multilin 750/760 Feeder Management Relay 4-3
4 USER INTERFACES 4.1 FRONT PANEL INTERFACE
4
input is asserted. Otherwise, this indicator will be off. Note that this indicator will always be in the opposite state of the
Reclosure Enabled LED.
• RECLOSURE IN PROGRESS (760 only): If a trip initiates a reclosing sequence, this indicator will go on continuously
during each of the programmed dead times.
• RECLOSURE LOCKOUT (760 only): If the programmed reclose sequence has progressed to a final lockout condi-
tion, this indicator will be on continuously. Lockout can be cleared by performing a reset.
• LOCAL: This indicator turns on if the local mode function has been assigned a logic input which is asserted. In local
mode, the front panel and keys operate while the Remote Open and Remote Close logic input functions
will not operate. As well, the communication open and close commands have no effect.
• MESSAGE: Under normal conditions, the default messages selected during setpoint programming are displayed. If
any alarm or trip condition is generated, a diagnostic message overrides the displayed message and this indicator
flashes. If there is more than one condition present, can be used to scroll through the messages. Pressing any
other key return to the normally displayed messages. While viewing normally displayed messages, the Message LED
continues to flash if any diagnostic message is active. To return to the diagnostic messages from the normally dis-
played messages, press . Note that diagnostic messages for alarms disappear with the condition while diagnos-
tic messages for trips remain until cleared by a reset.
d) OUTPUT STATUS LED INDICATORS
The 750/760 has eight (8) output relays: the 1 Trip, 2 Close, and 8 Self-Test Warning relays have fixed operation while the
3 to 7 Auxiliary relays are configurable. Regardless of the mode of operation, the corresponding front panel indicator turns
on while the output relay is signaling. If the non-operated state of an output relay is programmed as de-energized, the cor-
responding indicator will be on when the normally open contacts are closed. If the non-operated state of an output relay is
programmed as energized, the corresponding indicator will be on when the normally open contacts are open.
• 1 TRIP: A trip sequence can be initiated by a protection element, a logic input element, a remote open command, a
serial open command, or a front panel open command. When started, the Trip LED turns on briefly while the Trip Relay
is energized. After the auxiliary breaker contacts indicate that the breaker has opened, the Trip Relay and indicator
stop operating. If both 52a and 52b auxiliary contacts are not installed, the Trip Relay and indicator will de-energize
100 ms after the trip condition clears, or after two seconds.
• 2 CLOSE: A close sequence can be initiated by a 760 reclosure or a remote, serial, or front panel close command.
When started, the Close LED turns on briefly while the Close Relay energizes. After the auxiliary breaker contacts indi-
cate that the breaker has closed, the Close Relay and indicator stop operating. If both 52a and 52b auxiliary contacts
are not installed, the Close Relay and indicator operate for 200 ms.
• 3 to 7 AUXILIARY: These relays are intended for customer specific requirements that can be initiated by any protec-
tion element or function whose
RELAYS (3-7) setpoint has “3”, “4”, “5”, “6”, or “7” selected. The Auxiliary LEDs (3 to 7)
will turn on while the corresponding relays are operating.
• 8 SELF-TEST WARNING: During normal operation, this indicator is off with the fail-safe Self-Test Warning Relay ener-
gized. If any abnormal condition is detected during self monitoring (such as a hardware failure) the indicator turns on
and the relay de-energizes. If control power is lost or the relay is drawn out of its case, the Self-Test Warning Relay sig-
nals loss of protection by de-energizing, but the LED indicator remains off. Since there are no shorting contacts across
the Self-Test Warning Relay, both the normally open and normally closed contacts are open when the unit is drawn out.
4.1.3 KEYPAD OPERATION
The 750/760 display messages are organized into pages under the headings Setpoints and Actual Values. The key
navigates through the page headers of programmable parameters (setpoints). The key navigates through the page
headers of measured parameters (actual values). Each page is broken down further into logical sub-pages of messages.
The and keys are used to navigate through the sub-pages. A summary of the setpoints and actual values
pages can be found in the Chapters 5: Setpoints and 6: Actual Values, respectively.
The key is dual purpose. It is used to enter the sub-pages and to store altered setpoint values into memory to com-
plete the change. The key is also dual purpose. It is used to exit from sub-pages and also to abort a setpoint change.
The and keys are used to scroll through the possible choices of an enumerated setpoint. They also decre-
ment and increment numerical setpoints. Numerical setpoints may also be entered through the numeric keypad.
OPEN
CLOSE
NEXT
NEXT
SETPOINT
ACTUAL
MESSAGE
MESSAGE
ENTER
ESCAPE
VALUE
VALUE
Courtesy of NationalSwitchgear.com
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