Tab Pushbuttons - GE 869 Instruction Manual

DEVICE

Tab Pushbuttons

4–58
The Tab Pushbuttons provide an easy and error-free method of entering digital state (on,
off) information. Twenty (20) Tab Pushbuttons are available for programming.
The digital state of the Tab Pushbuttons can be entered locally (by directly pressing the
front panel pushbutton) or through Modbus by specifying the correct COMMAND
sequence. Typical applications include breaker control, autorecloser blocking, and settings
groups changes. The Tab Pushbuttons are under the control level of password protection.
Only one pushbutton can be pressed at a time. If multiple pushbuttons are pressed
simultaneously, the button pressed first takes the priority.
The Tab Pushbutton settings can be accessed from Setpoints > Device > Front Panel >
Tab Pushbuttons > Tab PB1. The Tab Pushbutton control can be executed by navigating
to Status > Summary > Tab Pushbuttons. By default, the summary page is shown to
quickly glance at the active tab pushbuttons. The individual pages can then be accessed
from the summary page.Each Tab Pushbutton asserts its own OFF and ON FlexLogic
operands (for example, TAB PB 1 ON and TAB PB 1 OFF). These operands are available for
each pushbutton and can be used to program specific actions. Each pushbutton has an
associated "LED" indicator. By default, this indicator displays the present status of the
corresponding pushbutton ON state.
The activation and deactivation of Tab Pushbuttons is dependent on whether latched or
self-reset mode is programmed.
SELF-RESET MODE: In Self-reset mode, a Tab Pushbutton remains active for the time it is
pressed (the pulse duration) plus the Dropout time specified in the settings. The pushbutton
is deactivated in Self-reset mode when the dropout delay specified in the Dropout Time
setting expires. The pulse duration of the pushbutton must be at least 100ms to operate
the pushbutton.
LATCHED MODE: In Latched Mode, a pushbutton can be set (activated) by directly pressing
the associated tab pushbutton. The pushbutton maintains the set state until deactivated
by another press of the same button. The state of each pushbutton is stored in non-volatile
memory and maintained through the loss of control power.
Path:
Setpoints > Device > Front Panel > Tab PBs > Tab PB1(X)
FUNCTION
Range: Self-reset, Latched, Disabled
Default: Disabled
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 issued
when the pushbutton is being physically pressed.
When in Self-Reset mode and activated locally, the pushbutton control logic asserts the
Tab PB [X] ON FlexLogic operand as long as the pushbutton is being physically pressed,
and after being released the deactivation of the operand is delayed by the 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. 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. When the pushbutton operand is in the ON state, the operand appears on the
target message until the pushbutton is pressed again to change it to the OFF state.
ID TEXT
Range: Up to 13 alphanumeric characters
Default: Tab PB 1 (or Tab PB[X])
This setting specifies the 13-character line of the user-programmable message and is
intended to provide the ID information of the pushbutton. This text is used to describe
the pushbutton in the FlexLogic operands.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS