E-Mon E-PS-S-HV-RTU - Manual (Page 21)

Chapter 2 Operating the
PowerSmart Socket PQM Billing and Energy Metering
PowerSmart Socket Power Quality Meter 21
Maximum Demand Registers
Any of billing energy registers can be individually linked to
the maximum demand and cumulative maximum demand
registers providing the same demand tariff structure as you
selected for energy registers.
Tariff Rates
The PowerSmart Socket PQM provides three options for
switching tariff rates:
• automatic via a programmable TOU calendar schedule
• external via communications by direct writing a tariff number
to the meter tariff register
• external via digital inputs by providing a tariff number code on
the meter tariff inputs
See Device Options and Mode Control in Chapter 5 on how to
program the tariff control mode and select tariff inputs in
your meter.
The meter tariff structure supports 8 different tariff rates
using an arbitrary tariff schedule.
The meter TOU calendar provides a season tariff schedule
and an option for scheduled daylight savings switch dates. A
total of 4 types of days and 4 seasons are supported with up
to eight tariff changes per day. See
Configuring Billing/TOU
for more information on programming the tariff calendar
schedule in your meter.
The present tariff rate is indicated on the PowerSmart Socket
PQM display. If required, tariff-switching pulses with a
programmable duration can be output via the meter relays.
End of Billing
The meter can be configured to trigger a reset of billing
maximum demands and an end of billing period automatically
on a monthly schedule, manually via the sealable DEMAND
RESET button, and remotely via communications. It can also
be done via control setpoints using any programmable
internal or external trigger, like a specific time schedule or an
external pulse.
You can select the reset sources via the Device Options setup
(see
Device Options and Mode Control in Chapter 5).
The PowerSmart Socket PQM uses a one-day protection
lockout time to avoid multiple consecutive resets of the billing
maximum demands.
Billing Data Recording and Load Profiling
The PowerSmart Socket PQM provides automatic recording of
the billing data to flash files:
• Monthly billing period data for the last 24 billing periods
• Daily energy and maximum demand profile for the last 120
days