User Manual Chapter 3
GFK-2749A Jan 2020
Configuration and Data Transfer 60
%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.
GRID 1 Grid Operational Mode
3-wire, single phase using PTA and
PTB
GRID 1 PTA_CA measurement
Set this to capture a waveform
Delta Mode is for 3-phase
Set this to reset Energy value to Zero
Always 1 for signal phase
Set for desired operation of Grid 2
Always 0 for signal phase
3.3.2 Configuration for 600VAC Single Phase System
The following shows a typical hardware configuration for a signal phase, 3-wire power
monitoring application. This example shows settings for Grid 1; all the settings can be
applied to the respective Grid 2 parameters. Empirical measurement showed that the
system runs, nominally, around 595VAC RMS with a maximum load, after the CT ratio, of
3.7A RMS. The offset and gain values are shown at their default values. For maximum
accuracy, the offset and gain values must be set, based on the IC694PSM001 module
faceplate label and on the IC694ACC200 terminal assembly label calibration constants.
Note that the 600V range will accurately measure voltages to slightly above 690VAC RMS.
The Nominal Voltage is the anticipated Phase-to-Neutral voltage in the single-phase
configuration.
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