Psm Signal Input Data - GE PACSystems RX3i User Manual

3

PSM Signal Input Data

Signal Data from the PSM Module for Two 3-Phase or Three 1-Phase Systems
3-14
The PSM module reports its analog data in 16-bit integer, pseudo-actual values. The
integer values are a fixed power of 10 offset from the actual measured value at the
Terminal Assembly. The following table lists the units of measure of each type of signal.
(For example, voltage is reported in 0.1V units, so a voltage reading of 1256 = 125.6V.)
Units of Measure
Physical Variable
VOLTAGE – V
CURRENT – I
ACTIVE POWER – P
REACTIVE POWER – Q
ACTIVE ENERGY – Ept
REACTIVE ENERGY – Eqt
4
POWER FACTOR - PF
LINE FREQUENCY – LF
PHASE SHIFT – PS
If the PSM module is configured as two 3-phase (or 3 x single phase) systems, the
following data is reported data to the host controller.
Note: Not all values are updated for all configuration types.
%AI Word
Offset
GRID 1– Phase An Voltage – RMS value
1
(phase-to-neutral)
GRID 1– Phase Ap Voltage – RMS value
2
(phase-to-phase)
GRID 1– Phase A Voltage – DC component
3
GRID 1– Phase A Current – RMS value
4
5 GRID 1– Phase A Active Power
6 GRID 1– Phase A Reactive Power
GRID 1– Phase Bn Voltage – RMS value
7
(phase-to-neutral)
GRID 1– Phase Bp Voltage – RMS value
8
(phase-to-phase)
GRID 1– Phase B Voltage – DC component
9
GRID 1– Phase B Current – RMS value
10
11 GRID 1– Phase B Active Power
4
Although the PSM reports power factor information using three decimal places, the
information is only accurate to two decimal places.
PACSystems* RX3i Power Sync and Measurement System – February 2013
Unit
0.1 [V]
0.001 [A]
1 [W]
1 [VAR]
1 [Wh]
1 [VARh]
0.001
0.01 [Hz]
0.1 [electrical degree]
Value
Example
2791= 279.1VACrms
4278 = 4.278Arms
2478 = 2,478W
965 = 965VAR
2158349 = 215,349Wh
37892 = 37,892VARh
923 = 0.923
6001 = 60.01Hz
257 = 25.7º
Comments
WYE configuration only
In Delta configuration always 0
WYE and Delta configurations
WYE configuration only
In Delta configuration always 0.
WYE and Delta C-common
configurations
Delta B-common always 0
WYE and Delta C-common
configurations
Delta B-common always 0
GFK-2749