Common Setpoints - GE MI-869 Instruction Manual

CHAPTER 4: SETPOINTS

Common Setpoints

NOTE:
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
8 Series Setup software is supplied with the relay. The relay leaves the factory with
setpoints programmed to default values, and it is these values that are shown in all the
setpoint message illustrations.
At a minimum, the
SETPOINTS / SYSTEM
function correctly. To safeguard against the installation of a relay whose setpoints have
not been entered, the Out-Of-Service self-test warning is displayed. In addition, the Critical
Failure relay is de-energized. Once the relay has been programmed for the intended
application, the SETPOINTS / DEVICE/INSTALLATION / Device In Service setpoint should
be changed from "Not Ready" (the default) to "Ready".Before putting the relay in "Ready"
state, each page of setpoint messages should be worked through, entering values either
by keypad or computer.
To make the application of this device as simple as possible, similar methods of operation
and similar types of setpoints are incorporated in various features. Rather than repeat
operation descriptions for this class of setpoint throughout the manual, a general
description is presented in this overview. Details that are specific to a particular feature are
included in the discussion of the feature. The form and nature of these setpoints is
described below.
• FUNCTION setpoint: The
operational characteristic of each feature. The range for this setpoint is: "Disabled",
"Trip", "Alarm", "Latched Alarm", and "Configurable".
If the FUNCTION setpoint is selected as "Disabled", then the feature is not operational.
If the FUNCTION setpoint is selected as "Trip", then the feature is operational. When
the "Trip" function is selected and the feature operates, the output relay #1 "Trip"
operates, and the LED "TRIP" is lit.
If the FUNCTION setpoint is selected as "Alarm" or "Latched Alarm", then the feature is
operational. When this function is selected, and the feature operates, the LED "ALARM"
is lit, and any assigned auxiliary output relay operates. The "Trip" output relay does
not operate, and the LED "TRIP" is not lit.
When Alarm function is selected and the feature operates, the LED "ALARM" flashes,
and it self-resets when the operating conditions are cleared.
When Latched Alarm function is selected, and the feature operates, the LED "ALARM"
will flash during the operating condition, and will be steady lit after the conditions are
cleared. The LED "ALARM" can be reset by issuing reset command.
If the FUNCTION setpoint is selected as "Configurable", the feature is fully operational
but outputs are not driving any action, such as output relay #1, Alarm LED or anything
else. The User has to program operands from this element to a desirable action which
may be the auxiliary output relay from the list of available relays in the element itself,
Flexlogic, Trip Bus etc.
The FlexLogic operands generated by the operation of each feature are active, and
available to assign to outputs, or use in FlexLogic equations, regardless of the selected
function, except when the function is set to "Disabled".
• PICKUP: The setpoint selects the threshold equal to or above (for over elements) or
equal to or below (for under elements) which the measured parameter causes an
output from the measuring element.
• PICKUP DELAY: The setpoint selects a fixed time interval to delay an input signal from
appearing as an output.
• DROPOUT DELAY: The setpoint selects a fixed time interval to delay dropping out the
output signal after being generated.
setpoints must be entered for the system to
<ELEMENT_NAME> FUNCTION
SETPOINTS MAIN MENU
setpoint determines the
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