GE N60 Instruction Manual page 317

CHAPTER 5: SETTINGS PRODUCT SETUP
Firmware revisions 3.2x and older use these three pushbuttons for manual breaker control. This functionality has been
retained—if the breaker control feature is configured to use the three pushbuttons, they cannot be used as user-
programmable control pushbuttons.
The location of the control pushbuttons are shown in the following figures.
Figure 5-52: Control pushbuttons (enhanced front panel)
An additional four control pushbuttons are included on the standard front panel when the N60 is ordered with the 12 user-
programmable pushbutton option.
Figure 5-53: Control pushbuttons (standard front panel)
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Control pushbuttons are not typically used for critical operations and are not protected by the control password. However,
by supervising their output operands, the user can dynamically enable or disable control pushbuttons for security reasons.
Each control pushbutton asserts its own FlexLogic operand. Each operand need to be configured appropriately to perform
the required function. Each operand remains asserted as long as the pushbutton is pressed and resets when the
pushbutton is released. A dropout delay of 100 ms is incorporated to ensure fast pushbutton manipulation is recognized
by various features that can use control pushbuttons as inputs.
An event is logged in the event record (as per user setting) when a control pushbutton is pressed. No event is logged when
the pushbutton is released. The front panel keys (including control keys) cannot be operated simultaneously—a given key
must be released before the next one can be pressed.
The control pushbuttons become user-programmable only if the breaker control feature is not configured for manual
control via the USER 1 through 3 pushbuttons as shown. If configured for manual control, breaker control typically uses the
larger, optional user-programmable pushbuttons, making the control pushbuttons available for other user applications.
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL 5-123