Demand Setup

ION 7500 / ION 7600 User’s Guide

 

 

Changing the Parameters that are Displayed

The meter’s default display configuration shows a comprehensive set of parameters. Changing these parameters requires that you alter the links between various ION modules. Complete details on configuring the front panel displays are provided in the Custom Front Panel Displays technical note in the Appendix A.

Demand Setup

Demand is a measure of average power consumption over a fixed time interval. Peak (or maximum) demand is the highest demand level recorded over the billing period. Two methods of measuring demand are with Thermal Demand modules and Sliding Window Demand modules. These modules are configured to calculate the average current demand and kW, kVAR and kVA demand. The setup registers in the demand modules define time intervals for demand calculations, setting the sensitivity of the module’s operation.

Sliding Window Demand Module Settings

Sliding Window Demand is often referred to as Rolling Block Demand. To compute sliding window demand values, the Sliding Window Demand module uses the sliding window averaging (or rolling interval) technique which divides the demand interval into sub-intervals. The demand is measured electronically based on the average load level over the most recent set of sub-intervals. This method offers better response time than fixed interval methods.

Setup Register

Function

Default

 

 

 

Sub Intvl

The time, in seconds, in the sliding window demand

900

sub-interval.

 

 

 

 

 

#SubIntvls

The number of sub-intervals in the sliding window.

1

 

 

 

Pred Resp

The speed of Predicted Demand calculations; use higher values

70

for faster prediction (70 to 99 recommended).

 

 

 

 

 

Thermal Demand Module Settings

The Thermal Demand module calculates thermal demand over a specified length of time. It uses a method which is equivalent to thermal averaging. For thermal averaging, the traditional demand indicator responds to heating of a thermal element in a Watt-Hour meter. You can adjust the Thermal Demand module's calculation to mimic this technique by changing the Time Const and Interval setup parameters.

Setup Register

Function

Default

 

 

 

Interval

The time, in seconds, in the thermal demand interval.

900

 

 

 

Time Const

The sensitivity to changes in the source signal; higher values

90

provide faster response time (common values are 63 and 90).

 

 

 

 

 

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Chapter 3 - Default Meter Functionality

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Multi-Tech Systems 7600 Demand Setup, Changing the Parameters that are Displayed, Sliding Window Demand Module Settings

7500, 7600 specifications

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