Emerson E2 - Manual (Page 193)

Irrigation Control Software Overview • 11 - 51
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.