GE 845 Instruction Manual page 179

CHAPTER 4: SETPOINTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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.
HOLD PRESSED
Range: 0.0 to 10.0 s in steps of 0.1 s
Default: 0.0 s
This setting specifies the time required for a pushbutton to be pressed before it is
deemed active.
The timer is Reset upon release of the pushbutton. Note that any pushbutton operation
will require the pushbutton to be pressed a minimum of 50 ms. This minimum time is
required prior to activating the pushbutton hold timer.
AUTORESET
Range: Disabled, Enabled
Default: Disabled
This setting enables the user-programmable pushbutton Autoreset feature. The setting
is applicable only if the pushbutton is in "Latched" mode.
AUTORESET DELAY
Range: 0.2 to 600.0 s in steps of 0.1 s
Default: 1.0 s
This setting specifies the time delay for automatic Reset of the pushbutton when in the
"Latched" mode.
LOCK
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
This setting assigns a FlexLogic™ operand serving to inhibit pushbutton operation from
the front panel pushbuttons. This locking functionality is not applicable to pushbutton
autoreset.
DROPOUT TIME
Range: 0.0 to 600.0 s in steps of 0.1 s
Default: 0.0 s
This setting applies only to "Self-reset" mode and specifies the duration of the
pushbutton "active" status after the pushbutton has been released. The length of time
the operand remains on has no effect on the pulse duration.
The setting is required to set the duration of the pushbutton operating pulse.
EVENTS
Range: Disabled, Enabled
Default: Enabled
DEVICE
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