PACSystems RX3i - Configuration for 120;208 3-Wire Delta System with Two Pts (Two Wattmeter Method), C-Common; C-Common

User Manual Chapter 3
GFK-2749A Jan 2020
Configuration and Data Transfer 66
%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. Turning off the Phase B
measurements sets the PSM to reconstruct the Vbc phase voltage and the IB current values
%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
1
3-phase
4
GRID 1 Connection mode
0
4-wire, WYE power system
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
1
VC1 measurement is on
10
GRID 1 CTC measurement
1
IC1 measurement is on
11
GRID 1 CTN measurement
1
IN1 measurement is on
12
GRID 1 Waveform Capture
0
Set this to capture a waveform
13
GRID 1 Delta Mode
0
Delta Mode only affects Delta
configurations
14
Reserved
0
Always zero
15
GRID 1 Energy reset
0
Set this to reset Energy value to Zero
16
Relay open
1
Clear this bit (AND set bit 32) to
request synchronizing the Grids
17 – 31
Grid 2 control bits
X
Set for desired operation of Grid 2
32
Relay close
0
Set this bit (AND clear bit 16) to
request synchronizing the Grids
3.3.5 Configuration for 120/208 3-Wire Delta system with
Two PTs (Two Wattmeter Method), C-Common
The following shows a typical hardware configuration for a 3-phase, 3-wire Delta power
monitoring application with the C-Phase used as common. 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-
Phase voltage in the Delta configuration. Though phase-to-ground is 120VAC, the PTs will
be connected from phase-to-phase, so the range must be set to 600VAC to accommodate
the 208V phase-to-phase.