Siemens ACCESS 9340 - Demand Synch Pulse Input

© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
PMCM-9340D-0208 ACCESS 9340 and 9360 Meters
2/2008 Chapter 5—Input/Output Capabilities
EN–61
Demand Synch Pulse Input
You can configure the meter to accept a demand synch pulse from an
external source such as another demand meter. By accepting
demand synch pulses through a digital input, the meter can make its
demand interval “window” match the other meter’s demand interval
“window.” The meter does this by “watching” the digital input for a
pulse from the other demand meter. When it sees a pulse, it starts a
new demand interval and calculates the demand for the preceding
interval. The meter then uses the same time interval as the other
meter for each demand calculation. Figure 5–2 illustrates this point.
See “Synchronized Demand” on page 47 in Chapter 4—Metering
Capabilities for more about demand calculations.
When in demand synch pulse operating mode, the meter will not start
or stop a demand interval without a pulse. The maximum allowable
time between pulses is 60 minutes. If 66 minutes (110% of the
demand interval) pass before a synch pulse is received, the meter
throws out the demand calculations and begins a new calculation
when the next pulse is received. Once in synch with the billing meter,
the meter can be used to verify peak demand charges.
Important facts about the meter’s demand synch feature are listed
below:
• Any installed digital input can be set to accept a demand synch
pulse.
• Each system can choose whether to use an external synch pulse,
but only one demand synch pulse can be brought into the meter
for each demand system. One input can be used to synchronize
any combination of the demand systems.
• The demand synch feature can be set up from ION Setup. See
the ION Setup online help for instructions on device set up of the
meter.