Siemens ACCESS 9340 - Page 251

© 2008 Siemens Energy & Automation, Inc. All Rights Reserved
PMCM-9340D-0208 ACCESS 9340 and 9360 Meters
2/2008 Appendix D—Glossary
EN–243
rolling block—a selected interval and subinterval that the meter uses for demand
calculation. The subinterval must divide evenly into the interval. Demand is updated at
each subinterval, and the meter displays the demand value for the last completed
interval.
sag/swell—fluctuation (decreasing or increasing) in voltage or current in the electrical
system being monitored. See also, voltage sag and voltage swell.
scale factor—multipliers that the meter uses to make values fit into the register where
information is stored.
safety extra low voltage (SELV) circuit—a SELV circuit is expected to always be
below a hazardous voltage level.
short integer—a signed 16-bit integer (see Register List on page 122).
sliding block—an interval selected from 1 to 60 minutes (in 1-minute increments). If
the interval is between 1 and 15 minutes, the demand calculation updates every 15
seconds. If the interval is between 16 and 60 minutes, the demand calculation updates
every 60 seconds. The meter displays the demand value for the last completed interval.
system type—a unique code assigned to each type of system wiring configuration of
the meter.
thermal demand—demand calculation based on thermal response.
Total Harmonic Distortion (THD or thd)—indicates the degree to which the voltage or
current signal is distorted in a circuit.
total power factor—see power factor.
true power factor—see power factor.
unsigned integer—an unsigned 16-bit integer (see Register List on page 89).
unsigned long integer—an unsigned 32-bit value returned by a register (see Register
List on page 89). The upper 16-bits are in the lowest-numbered register pair. For
example, in the register pair 4010 and 4011, 4010 contains the upper 16-bits while
4011 contains the lower 16-bits.
VAR—volt ampere reactive.
voltage sag—a brief decrease in effective voltage for up to one minute in duration.
voltage swell—increase in effective voltage for up to one minute in duration.
WinPM.Net—software designed by ACCESS for use in evaluating power monitoring
and control data.