Wiring - GE PACSystems RX3i User Manual

2

Wiring

2-10
DO NOT TOUCH the connectors or wiring after powering up the PSM
system. Hazardous voltages exist, and death or injury may result.
The Terminal Assembly frame ground connection must always be
installed and must be installed before any other wiring is attached.
Fuses on the voltage inputs are mandatory.
Potential transformers are mandatory. Fuses on input and output
leads for the PTs are mandatory. The COM1 and COM2 terminals
must be connected to frame ground to maintain a common
reference.
COM1 and COM2 terminals shall not be used for neutral or
protective earth connections. Certain fault conditions can cause the
neutral line to be pulled to the full phase to neutral voltage, posing a
danger to personnel and potentially damaging the Terminal
Assembly.
Current Transformer (CT) shorting bars are mandatory. One leg of
each CT secondary should be solidly connected to frame ground to
ensure that the current inputs remain at a safe potential, and to
reduce the noise induced into the system.
To reduce risk of electric shock or damage to the attached CTs, always
open or disconnect all voltage circuits and apply the shorting bar
connections to the current inputs before installing or servicing the
connections to the Terminal Assembly.
Never disconnect the GRID 1 or GRID 2 field wiring while power is
present. Personal injury or equipment damage may result. Finger
guards must be installed on the Terminal Assembly before
energizing the field wiring.
Wiring to the PSM consists of

Frame ground connections from the Terminal Assembly to the chassis.

The connection cable between the Terminal Assembly and the PSM

The leads to user-supplied potential transformers and current transformers

Sync relay output connections
Note: No CT shorting bars are provided on the PSM Terminal Assembly; these must be
supplied by the user.
PACSystems* RX3i Power System Measurement Module – February 2013
Warning
HIGH VOLTAGE; HIGH CURRENT
GFK-2749