Emerson E2 operation manual Cycle Scheduling, Zone Inhibit, Zone Bypass Inputs

11.21.2.1 Cycle Control Types

By default, Timed cycles are always used unless the user has configured a flow sensor (optional). If a flow sen- sor is configured, a control type parameter will become visible where the user can select either a Timed or Volume cycle control type.

During any cycle, the disabled zone states and valve outputs will be set to OFF.

For midnight crossover times, a cycle will be com- pleted if the duration extends into the next day.

11.21.2.2 Timed

Instead of start and stop times entered to define the length of time a zone is on, the user enters a duration of time. The default parameter called On Time (with a default value of 2 hours entered in HHH:MM format) is used when a certain length of time is desired for watering. Irrigation begins per cycle start time and lasts for all zone durations that are active for the current day. For example, if a time of 30 minutes (0:30) is entered, that zone will stay ON for 30 minutes and then shut OFF.

11.21.2.3 Volume

Under volume control, enabled zones will be cycled until the set volume of water for each zone has been dis- pensed for the current cycle or an amount of time has elapsed equal to the duration parameter. (This is a feature to prevent water runoff.) When irrigation is stopped for a zone due to elapsed time, control will cycle to the next active zone.

11.21.3 Cycle Scheduling

Irrigation cycles can only be started during a user- defined irrigation “season.” The Season Source parameter allows the user to select how to determine the season by either using the Dates parameters or the Summer/Winter input.

If the user selects Dates, start and stop day and month parameters will become visible and are used to specify the season. Each zone will have parameters to configure what days of the month it should participate in irrigation cycles. If the user selects Summer/Winter, an input of the same name will become visible under the Inputs tab. The sea- son will be active when this input indicates Summer.

The Summer/Winter input is automatically connected to the Global Data output of the same name.

If the season is not active, the System status will be set to Off Season and no normal or manual cycles will be possible. This prevents accidental cycles from occurring after the system has been “winterized.”

11.21.4 Zone Inhibit

Inhibiting sensors enable a zone to terminate irrigation early when enough water has been dispensed for the cur- rent cycle, or completely removes a zone from the cycle. Each zone is equipped with a digital inhibit input called Zone Inhibit.

If the inhibit input is ON, the zone status will be set to Inhibit and the valve output will be set to OFF.

11.21.4.1 Timed

If the zone is inhibited for Timed control types, it will be excluded from the cycle. If Zone Inhibit turns ON dur- ing the cycle, control will transfer to the next defined zone.

11.21.4.2 Volume

For Volume control types, the inhibited zone will be excluded from the cycle only while the inhibit input is ON. If the inhibit input turns off and the cycle is still in prog- ress, the zone’s state will again be set to Pending and will again be included in the cycle.

11.21.4.3 Rain Delay

The rain inhibit input should be connected to a rain sensor and will only function during the ON season. In the event of rain, a programmable rain delay of 0-7 days will prevent irrigation cycles for the user-defined number of days from when the rain sensor has detected rain. Active cycles will not be terminated if the input turns ON; how- ever, Rain Inhibit will begin when the active cycle ends.

An entry of 0 days will disable this parameter.

11.21.4.4 Freeze Lockout

An irrigation cycle should be terminated if the current environmental conditions will result in freezing of dis- pensed water. This is to prevent the sheeting of ice on any adjacent paved surfaces or sidewalks, which could create hazardous conditions for motorists and/or pedestrians.

Zones are inhibited from watering if the outside air temperature falls below the entered setpoint for Freeze Lockout.

11.21.4.5 Alarm

If the zone is inhibited for more than the number of days specified in the Inhibit Alarm setpoint, an Inhibit alarm will be generated for the zone. This alarm will return to normal when the zone is no longer inhibited.

11.21.5 Zone Bypass Inputs

Each zone has a digital bypass input called Zone Bypass Inputs. A zone can be bypassed to ON at any time while the application is enabled. A zone cannot be bypassed to OFF.

When a zone is bypassed to ON, the main water valve will be turned ON immediately.

Irrigation Control Software Overview • 11-51