Terminal Assembly; Connectors - GE PACSystems RX3i User Manual

Terminal Assembly

Connectors

Grounding stud
GFK-2749
The Terminal Assembly accepts three voltage inputs and four current inputs for each of
two grids. The Terminal Assembly translates the 0–5 A current signals and the
45–690 VAC RMS voltage signals to low voltage signals for use by the PSM module.
Voltage inputs are connected through external, user-supplied potential transformers (PT).
External, appropriately-sized current transformers (CT) are used to translate grid or load
currents down to the 0–5 A range required by the Terminal Assembly.
The Terminal Assembly provides two terminal blocks, each with 12 screw terminals, for
the voltage and current inputs from the grids. The terminals accept up to 10 AWG wire
commonly used in power utility applications.
The Terminal Assembly provides two pairs of Mini-D 20-pin connectors for connection to
the PSM module using the interface cables. The 45–120 VAC or 120–690 VAC range is
selected by connecting the interface cables to the corresponding pair of Mini-D
connectors.
When the cables are connected to the correct grid and matching voltage ranges, the PSM
module provides an indication that the cables are correctly attached to the unit.
A four-pin pluggable connector provides two isolated solid state relay contacts that close
when the correct voltage, phase, and relative frequency differences match the configured
criteria for synchronization of the GRID1 and GRID2 signals.
Note: The Terminal Assembly is not equipped with CT shorting-bars. These must be
provided separately by the user.
GRID 1
Terminal Block
GRID 2
Terminal Block
Chapter 1 PSM Module Description and Specifications
Plastic finger guard
600V GRID 1
120V GRID 1
600V GRID 2
Grounding stud
120V GRID 2
1
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