Emerson E2 Irrigation Control, Accumulator Reset Types, High Trip, Zones and Cycles

total accumulation, and the last accumulated total informa- tion can be viewed.

The current output shows the rate of consumption of the quantity represented by pulses. Average output shows the average rate value accumulated over the period set in the Average Window parameter. The High Limit Trip out- put will turn on if the total accumulation exceeds a user- specified high limit. Total accumulation shows the total accumulated value since the last reset. Last Total output shows the total accumulated value when the last reset occurred.

11.20.4 Accumulator Reset Types

The Pulse Accumulator is a register that is increased by the value of each update of the Quantity Accumulation input. Each time the Accumulator is reset, before clearing, its value is saved to a Last Total output. The type of reset the Accumulator uses can be user-specified with the Accu- mulator Reset Type parameter. The Accumulator can be set to reset at a certain time of day, day of the month, when a high-limit trip occurs, or not to reset at all.

11.20.5 Logging

Rate and usage data is logged and stored using applica- tion logging. Data is stored in hourly, daily, and monthly formats. All logged data can be erased from memory by using the Applications Command menu. In addition, appli- cation logs show the total and peak rates of consumption for the last day, hour, and month.

The Hourly log will be updated every hour at the top of the hour and contain data for the last 48 hours. Time, date, total accumulation for that hour, maximum average for that hour, maximum peak value, and time of peak value, are stored in this log.

The Daily log will contain data for the last 48 days. Date, total accumulation for that day, maximum average for that day, maximum peak value, time of peak value, and minutes tripped are stored in this log.

The Monthly log will contain data for the last 24 months. The log will be updated on a user-specified day of the month. Date, total accumulation for that month, maxi- mum average for that month, maximum peak value, time of peak value, and date of peak value are stored in this log.

Application graphing generates hourly, daily, and monthly graphs from the application log data. All graphs show the total and max average.

On the main Status screen, consumption for the current hour, day, and month are displayed.

11.20.6 High Trip

A high-trip output can be triggered if the Accumula- tor’s total quantity exceeds a user-defined setpoint. The

trip point output can be controlled by any of three input sources. The output will be turned ON when the input source is equal to or greater than a user-specified value. The total amount of time the application has been in a high trip condition is shown in the Time In Trip Today output.

11.21 Irrigation Control

11.21.1 Overview

Irrigation control is an application used for the con- trolling of sprinkler systems. This application controls watering by duration of time or water usage parameters. Days of the week and times for watering are set by the user with a maximum of two Irrigation applications allowed in the CX controller.

The master water valve is turned ON and OFF as water is needed for a zone. When disabled, no application con- trol of any outputs will be possible and the System Status output will indicate Disabled.

Under normal control only one zone will be active at a time.

11.21.2 Zones and Cycles

A zone is defined as a single line of irrigation fed from a main water supply valve (i.e., a group of sprinklers that are attached to the same line of irrigation). Up to 16 zones of irrigation per application are supported with six start times for watering. The user will be able to configure each zone to function on different days of the week or odd or even days of the month.

Zones are turned ON one at a time starting from the first enabled zone. The zone that is ON is considered to be the active zone. Its state is set to ON and its valve output is also set to ON. When the active zone completes its time duration, its state will be set to Done and its valve output set to OFF.

For enabled zones that are not active or complete, the states will be set to Pending and the valve output set to OFF.

A cycle is the sequence of all defined zones irrigating one at a time. A cycle is considered complete when the last defined zone finishes irrigating and shuts OFF. Each zone turns ON one at a time, starting with the first defined zone until the last defined zone in the list turns OFF.

The Number of Zones parameter (with a default value of 4) specifies how many zones the application will use. No two zones are ever ON at the same time; each zone starts and stops independently and waits for the other to finish before another zone starts.

Irrigation Control Software Overview • 11-51