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IQ 150S/250S 5: Communication
To calculate the speed at which the energy will rollover, you must know the Energy Full Scale,
which is computed from the CT and PT Full Scale values (see Section 9.2.4.1). The formula for
calculating Energy Full Scale is:
Wye system: CT Full Scale x PT Full Scale x 3
Delta system: CT Full Scale x PT Full Scale x 3 x 3
For example, for a CT Full Scale of 2000, PT Full Scale of 14400, Wye system:
2000 x 14400 x 3=86400000
In this example, the energy will increment at 86400000 Watts per hour, or 24000 Watts per sec-
ond.
This value allows you to determine the number of digits, decimal places, and energy scale you
want to configure for the Energy settings, when you take into account the rollover time. To deter-
mine the number of hours before rollover, use this formula:
[Max Resolution]/[Full Scale] = #Hours, where Max Resolution = maximum digits and decimals for
the Energy scale in use.
Using the example from above, with an energy scale of Mega, the formula would be:
99999.999 M/86.4 M = 1157.4074 hours or about 48 days until rollover.
NOTE
: To increase the number of days until rollover, you can:
• Increase the number of digits (to 8)
• Decrease the number of decimal places (to 0)
• Increase the Energy Scale (to M).
Demand Averaging
Demand is the average rate of energy use over time. The IQ 250S supports two types of demand
averaging: Fixed demand and Sliding demand:
• Fixed demand records the average demand for time intervals that you define (usually 5, 15 or 30
minutes).
Summary of Contents for IQ 150S
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