General Wiring Notes; Terminal Assembly Frame Ground Connection - GE PACSystems RX3i User Manual

General Wiring Notes

Requirements for Terminal Assembly Connections

Terminal Assembly Frame Ground Connection

GFK-2749
In the following connection diagrams, the line connections are labeled L1, L2, and L3.
When you wire the Terminal Assembly into a system, you must decide which line will
correspond to which phase. Usually, L1 will correspond to phase A, L2 with phase B, and
L3 with phase C. Once you decide how to connect the system, the labels L1, L2 and L3
can be changed to A, B, and C according to your system configuration. Then the diagrams
can be followed and the connections made.
Although Grid 1 and Grid 2 are interchangeable, you should connect the most stable
source to Grid 1. Between a utility grid and a generator, the utility grid is the best choice
for connection to the PSM Grid 1 inputs. This will yield the most accuracy and the least
reading-to-reading fluctuation.
Terminal Assembly connections above 600VAC required prepared wire ends, such as
tinning of the conductors, or use of crimpled or soldered forked connectors or ferrules.
Terminal connections for COM1, COM2, voltage sensing and current
sensing terminals
Terminal torque: 1.81 Nm (16 in-lb)
Wiring size/type: 0.823 mm
Relay output terminal connections
Terminal torque: 0.8 Nm (7 in-lb)
Wiring size/type: 0.205 mm
Potential transformers MUST be used for voltage isolation and
scaling purposes. Current Transformers must be used for all current
measurements. Please refer to the following diagrams.
The basic system configuration consists of the host controller, the PSM and the Terminal
Assembly. Interface cables are used to connect the PSM to the Terminal Assembly. The
Terminal Assembly must have frame ground connected to ensure that the metal
case on the Terminal Assembly is safely at ground potential. In the diagrams
following, specific wiring configurations are detailed. Make sure that the safety features
detailed in the drawings are included in your installation. Failure to do so could result in
personal injury or death and equipment damage.
Chapter 2 Installation
2 2
– 5.26 mm
(18–10 AWG) solid/stranded
2 2
– 0.410 mm
(30–12 AWG) solid/stranded
Warning
2
2-11