PACSystems RX3i - Three-Phase WYE Configuration Example

User Manual Chapter 3
GFK-2749A Jan 2020
Configuration and Data Transfer 62
%Q Configuration Values
This table shows the settings for Grid 1. The same settings apply to the Grid 2 control bits.
These bits must be set during the first PLC scan when the PLC transitions to run mode. %Q
offset 2, 3 & 4 and 18, 19 & 20 set the PSM for the field voltage and power configuration.
Setting these values incorrectly will yield invalid readings. All remaining bits may be
changed during run mode to adapt to changing field conditions.
%Q Bit
Offset
Function
Value
Comment
1
GRID 1 Operation
1
Enable grid 1
2
GRID 1 Voltage Selection
0
120VAC range
3
GRID 1 Grid Operational Mode
0
Single phase
4
GRID 1 Connection mode
1
3-wire, single phase using PTA and
PTB
5
GRID 1 PTA_CA measurement
1
VA1 measurement is on
6
GRID 1 CTA measurement
1
IA1 measurement is on
7
GRID 1 PTB measurement
1
VB1 measurement is on
8
GRID 1 CTB measurement
1
IB1 measurement is on
9
GRID 1 PTC measurement
0
VC1 measurement is off
10
GRID 1 CTC measurement
0
IC1 measurement is off
11
GRID 1 CTN measurement
0
IN1 measurement is off
12
GRID 1 Waveform Capture
0
Set this to capture a waveform
13
GRID 1 Delta Mode
0
Delta Mode is for 3-phase
14
Reserved
0
Always zero
15
GRID 1 Energy reset
0
Set this to reset Energy value to Zero
16
Relay open
1
Always 1 for signal phase
17 – 31
Grid 2 control bits
X
Set for desired operation of Grid 2
32
Relay close
0
Always 0 for signal phase
3.3.3 Configuration for 120/208 WYE Three-Phase Four-Wire
System
The following shows a typical hardware configuration for a 3-phase, 4-wire WYE power
monitoring application. This example shows settings for Grid 1; all the settings can be
applied to the respective Grid 2 parameters. Note that the offset and gain values were found
on the IC694PSM001 module faceplate label and on the IC694ACC200 terminal assembly
label. The Nominal Voltage is the anticipated Phase-to-Neutral voltage in the WYE
configuration.