GE 845 Instruction Manual page 185

CHAPTER 4: SETPOINTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Path:
Setpoints > Device > Programmable PBs > Pushbutton 1(X)
FUNCTION
Range: Self-reset, Latched, Disabled
Default: Self-reset
This setting selects the characteristic of the pushbutton. If set to "Disabled" the
pushbutton is not active and the corresponding FlexLogic operands (both ON and OFF)
are de-asserted. If set to Self-reset the control logic is activated by the pulse (longer
than 100 ms) issued when the pushbutton is being physically pressed.
When in Self-reset mode and activated locally, the pushbutton control logic asserts the
ON corresponding FlexLogic operand as long as the pushbutton is being physically
pressed, and after being released the deactivation of the operand is delayed by the
PUSHBTN 1 DROPOUT TIME setting. The OFF operand is asserted when the pushbutton
element is deactivated.
If set to Latched the control logic alternates the state of the corresponding FlexLogic
operand between ON and OFF on each button press or by virtually activating the
pushbutton (assigning Set and Reset operands). When in Latched mode, the states of
the FlexLogic operands are stored in a non-volatile memory. Should the power supply be
lost, the correct state of the pushbutton is retained upon subsequent power-up of the
relay.
ID TEXT
Range: Up to 13 alphanumeric characters
Default: Open (PB1), Close (PB2), F1 (PB3), Gnd Trip Enabled (PB4), SCADA Enabled (PB5),
Hot Line Tag (PB6), Demand Reset (PB7), Alt Settings (PB8), Target Reset (PB9), PB Block
(PB10)
This setting specifies the 13-character line of the user-programmable message and is
intended to provide the ID information of the pushbutton.
ON TEXT
Range: Up to 13 alphanumeric characters
Default: PB1 On (or PB[X] On)
This setting specifies the 13-character line of the user-programmable message and is
displayed when the pushbutton is in the "ON" position. Refer to the Working with
Graphical Display Pages section for instructions on entering alphanumeric characters
from the keypad.
OFF TEXT
Range: Up to 13 alphanumeric characters
Default: PB1 Off (or PB[X] On)
This setting specifies the 13-character line of the user-programmable message and is
displayed when the pushbutton is activated from the "ON" to the "OFF" position and the
PUSHBUTTON 1 FUNCTION is "Latched". This message is not displayed when the
PUSHBUTTON 1 FUNCTION is "Self-reset" as the pushbutton operand status is implied to
be "OFF" upon its release. The length of the "OFF" message is configured with the
PRODUCT SETUP/DISPLAY PROPERTIES/FLASH MESSAGE TIME setting.
The message programmed in the PUSHBTN 1 ID and PUSHBTN 1 ON TEXT settings will be
displayed as long as PUSHBUTTON 1 ON operand is asserted, but not longer than the
time period specified by the FLASH MESSAGE TIME setting. After the flash time has
expired, the default message or other active target message is displayed. The
instantaneous Reset of the flash message will be executed if any relay front panel
button is pressed or if any new target or message becomes active.
The PUSHBTN 1 OFF TEXT setting is linked to PUSHBUTTON 1 OFF operand and will be
displayed in conjunction with PUSHBTN 1 ID only if the pushbutton element is in
"Latched" mode.
DEVICE
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