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Event 1 (through 10)
Enter these menus to program timer events via the menus below:
Repetition
Select the time cycle to repeat the event: Hourly, Daily, 1 Week, 2 Week, 4
Week, or None.
An event means that the output is turned on at the same time of day, for the
same amount of time, and except for the Daily cycle, on the same day of the
week.
Week
Only appears if Repetition is longer than 1 Week. Select the week during
which the event will occur.
Day
Only appears if Repetition is longer than Daily. Select the day of the week
during which the event will occur.
Events Per Day
Only appears if Repetition is Hourly. Select the number of events per day.
The events occur on the Start Time and then evenly spaced throughout the
day.
Start Time
Enter the time of day to start the event.
Duration
Enter the amount of time that the relay will be on.
Input
Select the sensor that will be washed.
Input 2
Select the second sensor, if applicable, that will be washed.
Sensor Mode
Select the effect that the probe wash event will have on any control outputs
that use the sensor(s) being washed. The options are to either Disable the
sensor readings (turn the control output off) or Hold the sensor reading at
the last valid sensor reading prior to the start of the probe wash event.
Hold Time
Enter the amount of time needed to hold the sensor reading after the event
has finished, in order for the wash solution to be replaced by process solu
-
tion.
5.3.17
Relay, Spike Control Mode
Basic Timer Operation
This algorithm is typically used to provide a baseline amount of chlorine for disinfection, and periodically shocking
the system with a larger dose. During normal operation, the relay will be reacting to the sensor to maintain a set point
within a programmable Deadband, as described in On/Off Control Mode above. When a Spike event triggers, the al-
gorithm will change from the normal set point to the Spike Set Point, for the programmed time. Once the time expires,
control to the normal set point resumes. The Onset Time setting allows the user to decide if the programmed spike
duration time starts counting down immediately, or if the controller will wait until the higher set point is achieved (or
the onset time expires, whichever comes first) before starting the spike Duration timer.
Special Condition Handling
Overlapping timer events
If a second timer event occurs while the first one is still active, the second event will be ignored. An Event Skipped
alarm will be set.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timer control.
A digital input or output interlock condition does not delay the relay activation. The relay activation duration timer
will continue even if the relay is deactivated due to an interlock condition. This will prevent delayed events which
can potentially cause problems in they do not occur at the correct time.
“Activate With” Conditions
“Activate with channels” settings override the relay control, but do not change the operation of the timer control.
The relay activation duration timer continues counting when the timer relay is forced on, and ends at the expected
time (event start time plus duration). If the “activate with” condition continues after the end of the event time, the
relay remains activated.
Alarms
An Event Skipped alarm is set when a second timer event occurs while one event is still running.
