Rockwell Automation 1402-LSM Line Synchronization Module Installation Instructions - Manual (Page 28)

Chapter 3
General Operation
3–6
Power Monitoring
In addition to the synchronization function, the LSM provides an extensive
array of monitoring information. This data is accessible through one of
several different block transfers. (See Appendix B, “Block Transfer Tables
and Discrete I/O Definition”, for additional information.) All voltage and
current measurements presented by the LSM are true RMS. The power
measurements are calculated from the instantaneous voltage and current
measurements. The remainder of the monitoring information is calculated
from these values.
The LSM will clip the input voltages at approximately 1.25 times the
maximum voltage input level. If this clipping takes place, the value 999 will
be returned in every data field affected by the clipped channel.
The monitored values are scaled and reported based on the configuration
entries that were provided by the user. This function is terminated if new
configuration data is received. The new configuration data is evaluated and
normal operation is resumed upon acceptance of the data. During
synchronization those parameters not required for synchronization are
monitored at a reduced priority. This allows critical synchronization data to
be updated at a faster rate.
+kVAR (Import)
kVARH–F (Forward)
(Power Factor Leading)
(+)
Pf = 100%
–kW (Export)
kWH (Reverse)
180 ° 0 °
270
°
90
°
(Power Factor Lagging)
(–)
Pf = 0
–kVAR (Export)
kVARH–R (Reverse)
(Power Factor Lagging)
(–)
Pf = 100%
+kW (Import)
kWH–F (Forward)
(Power Factor Leading)
(+)
Pf = 0
NOTE: Lagging Factor indicated by a minus sign.
I II
III IV
Operational Characteristics
Continued