Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 184)

184 Publication 1404-UM001F-EN-P - November 2009
Chapter 8 Advanced Features
The Transient Capture Results table comprises the transient capture
results. This read-only table comprises these 29 (DeviceNet network)
or 59 (all other communication options) integer elements:
•
Capture timestamp: in three elements using the standard
timestamp format except the year is omitted
•
Capture number: in the range 1…6
•
Channel number: in the range 1…7 (1=V1, 2=I1, 3=V2, 4=I2,
5=V3, 6=I3, 7=I4)
•
Block number: block number of the data contained in the table.
See above.
•
Transient capture identifier: range 0…30,000, rolls over to 0
•
Transient capture data points: see below
Transient Capture Data Points
The results table contains 20 data points for optional DeviceNet
communication or 50 data points for all other communication options.
Data points are numbered 1…20 or 1…50 in each block. The block
number ranges from 1…70 for the DeviceNet network and 1…28 for
all other communication options. The client calculates each data
point’s place in the transient capture by using the following formula:
The total number of data points is 1400. Each data point is expressed
in calibrated analog-to-digital (A/D) converter counts with a resolution
of 8192 (13-bit w/sign). A client may calculate the primary-side
instantaneous voltage or current magnitude of each data point by
using the following formula:
N
datapoint_capture
N
block
1 – ( ) N
datapoint_this_read
+ =
N
datapoint_capture
= the sequence number of the data point in the capture channel
N
block
= the block number
N
datapoint_this_read
= the data point number (1 … 20 or 1 … 50) in the current read
M
i
M
max rms ( )
2 •
R
max
-------------------------------------- N
t
M
data
• • =
M
i
= instantaneous value of the voltage or current data point
M
(max rms)
= max rms magnitude
= 399.0 line-to-neutral volts for channels 1, 3 and 5
= 691.1 line-to-line volts for channels 1, 3 and 5
=10.6 amperes for channels 2, 4, 6 and 7
R
max
= maximum resolution
= 8192 for 13-bit w/sign
N
t
= PT or CT ratio
= PT or CT primary / PT or CT secondary
M
data
= value of the data point from Transient Capture Results Parameters, page 252