Demand Forgiveness ION 8000 Series User Guide
Page 120 Chapter 9 - Demand
NOTE
During a Demand Forgiveness period, Demand module inputs are set to zero and do not reflect actual
demand.
These values should not be used to calculate energy for billing purposes
. Energy values are not
affected and will reflect actual energy consumption during the Demand Forgiveness period.
The settings listed below must be made for Demand Forgiveness functionality.
These settings can be accessed from ION Setup software; refer to “Using ION
Setup” on page 122.
Minimum Outage Duration lets you specify the amount of time (in seconds) that
the power must be out before the Demand Forgiveness period begins.
Demand Forgiveness Duration lets you specify the amount of time (in seconds)
that demand is forgiven (demand inputs are zero).
Update Rate lets you define the update rate of the SWinDemand output register
and is set to E
VERY SECOND by default for revenue-related demand modules.
With this setting, demand value measured is updated once per second.
Outage Voltage (line-to-line average in unscaled meter units) lets you define a
voltage level that is considered an outage. This is set to 20 volts by default.
The preceding diagram shows an example of a meter that is set up for Demand
Forgiveness. The Sliding Window/Rolling Block Demand module is averaging
demand values at 15 minute intervals. During interval #1, the meter has a power
outage that lasts for 18 minutes. The power outage is defined by a system voltage
of 20 volts which has been specified in the Outage Voltage setting. The Minimum
Outage Duration setting is specified as 10 minutes, so this is amount of time that the
power must be out before demand can be forgiven. The Demand Forgiveness
Duration setting is specified as 1800 seconds (30 minutes), so for 30 minutes
following power restoration, demand inputs are zero. The power is restored
during interval #2, where the surge of power consumption during power-up is
included in the Demand Forgiveness period and has a value of zero.
The specified amount of time that the power must be out before demand
is forgiven
A
B
The specified amount of time that demand is delayed during the Demand
Forgiveness period
1:45
Power Outage
Demand Forgiveness begins
A
KW
Time
Power
Demand Forgiveness ends
1:30
Demand
Interval #1
Demand
Interval #2
2:00
Demand
Interval #3
B
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