GE 750 User Manual

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750/760 Feeder Management Relay GE Power Management
7.5 LOGIC DIAGRAMS 7 SETPOINTS
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7.5 LOGIC DIAGRAMS 7.5.1 DESCRIPTION
The logic diagrams provided should be referred to for a complete comprehensive understanding of the opera-
tion of each feature. These sequential logic diagrams illustrate how each setpoint, input parameter, and inter-
nal logic is used in a feature to obtain an output. In addition to these logic diagrams, written descriptions are
provided in the setpoints chapter which includes each feature.
7.5.2 SETPOINTS
• Shown as a block with a shaded heading labeled ‘SETPOINT’.
• The location of setpoints is indicated by the path heading on the diagram.
• The exact wording of the displayed setpoint message identifies the setpoint.
• Major functional setpoint selections are listed below the name and are incorporated in the logic.
7.5.3 MEASUREMENT UNITS
• Shown as a block with an inset box labeled ‘RUN’.
• The associated pickup or dropout setpoint is shown directly above.
• Element operation of the detector is controlled by the signal entering the ‘RUN’ inset. The measurement /
comparison can only be performed if a logic ‘1’ is provided at the ‘RUN’ input.
• Relationship between setpoint and input parameter is indicated by mathematical symbols:
‘<‘ (less than), ‘>‘ (greater than), etc.
• ANSI device number (if one exists) is indicated above the block.
7.5.4 TIME DELAYS
• Shown as a block with the following schematic symbol,

————

.
• If delay is adjustable, associated delay setpoint is shown directly above, and schematic symbol has an
additional variability indication, an oblique bar.
• ANSI device number (62) is indicated above the block.
7.5.5 LED INDICATORS
• Shown as the following schematic symbol,
⊗.
• The exact wording of the front panel label identifies the indicator.
7.5.6 LOGIC
• Described using basic logic gates ( ‘AND’, ‘OR’, ‘XOR’, ‘NAND’, ‘NOR’, ... )
• The inverter symbol, a logical NOT, is shown as a circle,  .
7.5.7 CONDITIONS
• Shown as a rounded block with a shaded heading labeled ‘CONDITION’.
• Conditions are mutually exclusive, i.e., only one condition can be active at any point in time.
• Conditions latch until another condition becomes active.
• The output of an active condition is 1 or logic high.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English