Siemens MD-P1, Руководство пользователя, Страница: 68 / 76

Appendices
Appendix F - Measuring Consumption (kWh), Demand, and Other Applications
68
Siemens Industry, Inc. 125-201
09/30/2019
01296 C SET THE DEMAND LIMIT
01298 C
01300 PDLSET(”%X%ARE”, ”%X%EX”, ”%X%SP1”, ”%X%TM1”, ”%X%SP2”, ”%X%TM2”)
01394 C
01396 C POWER CONSUMPTION TARGETS
01398 C
01400 PDLDPG(”%X%ARE”, ”%X%KW1”, ”%X%TG1”)
10000 GOTO 1000
The PDLMTR statement can use a demand (for example, kW, kVa) from the power
meter for peak demand limiting applications. The summation of power meter
accumulator (HI and LO) points should not be used for peak demand limiting
applications due to summation round-off error in analog point.
You can use the power meter in the APOGEE Peak Demand Limiting (PDL)
Application to gain this benefit. For more information on the PDL application, see the
APOGEE Field Panel User’s Manual
(125-3000).
Data Reliability
Many power meter/field panel applications require “high data reliability”. This means
that trend data collection must be configured to reduce the risk of data loss. To reduce
the risk of data loss, schedule trend data collection for regular intervals (for example,
every two hours) or use the Trend Buffer Full option to upload trend data to the Insight
workstation. To facilitate long-term data collection, schedule trend data conversions
daily at the Insight workstation in order to store trend data in the .CSV file format on
hard disk. At a later date, the .CSV files can be imported into a report application to
develop load profiles, cost allocation, or tenant billing reports.
Power Failure
On power failure, the power meter retains the last observed kWh value in nonvolatile
memory. All other values are instantaneous in nature and not stored during power
failure.