Programmable Pushbuttons - GE 850 Instruction Manual

CHAPTER 5: DEVICE, SYSTEM, INPUT AND OUTPUT SETPOINTS
Programmable
Pushbuttons
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
The user-programmable pushbuttons provide an easy and error-free method of entering
digital state (on, off) information. Depending on the faceplate three to ten pushbuttons are
available for programming.
The digital state of the pushbuttons can be entered only locally (by directly pressing the
front panel pushbutton). Typical applications include breaker control, autorecloser
blocking and settings groups changes. The user-programmable pushbuttons are under the
control level of password protection.
Figure 5-9: Programmable PBs vs Front Panel Type
3 Pushbutton Rugged and Membrane Front Panels
10 Pushbutton Membrane Front Panel
Each pushbutton asserts its own ON and OFF FlexLogic operands (for example,
PUSHBUTTON 1 ON and PUSHBUTTON 1 OFF). These operands are available for each
pushbutton and are 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 or OFF). This can be changed by programming the LED Trigger setting in
the Programmable LED settings menu.
The activation and deactivation of user-programmable pushbuttons is dependent on
whether latched or self-reset mode is programmed.
LATCHED MODE
In Latched Mode, a pushbutton can be set (activated) by directly pressing the associated
front panel pushbutton. The pushbutton maintains the set state until deactivated by a
Reset command or after a user-specified time delay. The state of each pushbutton is
stored in non-volatile memory and maintained through loss of control power.
The pushbutton is Reset (deactivated) in Latched Mode by directly pressing the associated
active front panel pushbutton. It can also be programmed to Reset automatically through
the PB 1 AUTORESET and PB 1 AUTORESET DELAY settings. These settings enable the auto-
reset timer and specify the associated time delay. The auto-reset timer can be used in
DEVICE
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