Page 12
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Operation and Maintenance Manual
Rev: L13
A – 5.2: Chlorine Control (continued)
Failsafe Timer (Op):
This value sets the time
that the relay is allowed to stay continuously on.
The most common failures of automated
chemical feed systems are depletion of the
chemical supply and/or chemical feeder
failure. Both problems result in the controller
being unable to reach set point in a reasonable
period of time. The failsafe timer sets the
maximum length of time the feeder can run.
If the feeder has been trying to achieve set
point without success for the selected time,
the controller will cut power to the feeder,
flash the Reset Fail/Safe LED on the face
panel and display a message to alert the
operator. If in TBP Pause mode, the
controller will reset the timer.
An operator must reset the failsafe through
the Reset Fail/safe button to re-enable normal
control.
Alt Set Point (Op):
The 4 Event 28 Day Timer
allows you to program a schedule to define when
to use alternate set point.
Alt Set Point 4 Event 28 Day Timer:
To
program the 4 Event 28 Day Timer, perform
the following:
Select the Alt. Set point from the Cl (Br)
Control menu.
Now select the 4Event 28Day Timer from the
Alt. Set Point menu.
Selecting Event1 will allow you to select the
weekly interval to use the alternate set point.
If the 1st, 2nd, 3rd, or 4th week is selected,
the timer will only trigger on that week in the
four-week cycle. The Odd Weeks selection
will trigger on the 1st and 3rd weeks, the
Even Weeks selection will trigger on the 2nd
and 4th weeks, and the Every Week selection
triggers every week.
The week number and day of week for the
current date is displayed on the bottom
right side of these screens.
The first week is fixed to be the week of
Sunday, January 2
nd
, 2000 and every four
weeks afterwards.
The next set of screens will allow you to
choose the actual day(s).
Select what day of the week, or every day, the
alternate set point should be used.
Once you make your selection you will be
returned to the 4Event 28Day Timer menu
where you will have a new menu item: Event
1 Times.
Select the Event1 Times from the 4Event
28Day Timer menu.
This screen allows you to set both the start
time and the end time for the event's
programmed weeks/days. To toggle
AM/PM, press the +/- key while the cursor is
on the time you wish to change.
If your start time is before midnight (12:00
AM) and the end time is after midnight, the
alternate set point will continue to be used
the following day up to the end time even if
that day did not fall within the week/day
selection for that event.
Example:
Event1 Week/Day:
Odd weeks/ Tuesday
Event1 Times:
11:00 PM to 3:00 AM
Event2 Week/Day:
Even weeks/ Monday
Event2 Times:
11:00 PM to 6:00 AM
Current Week/Day: 2nd/Tuesday
Current Time:
4:00 PM
The alternate set point last ran from 11:00 PM
last night to 6:00AM this morning.
The next time the alternate set point will run will
be from 11:00 PM next Tuesday to
3:00AM next Wednesday.
ORP Set Point (Op):
This value sets the
desired level to maintain the ORP at during any
of the programmed alternate set point events.
Free Cl Set Point (Op):
This option is only
available if the free Cl probe is installed and the
Control Source is set to free Cl.
This value sets the
desired level to maintain the free Cl at during
any of the programmed alternate set point
events.
Bracketed Free Cl (Op):
This option is only
available if the free Cl probe is installed and the Control
Source is set to ORP.
If enabled, the controller will
override the ORP control so that the free Cl will
not drop out of a programmed range.
Bracketed ORP (Op):
This option is only available if
the free Cl probe is installed and the Control Source is set to
free Cl.
If enabled, the controller will override the
free Cl control so that the ORP will not drop out
of a programmed range.
Warning: Disabling the failsafe timers is
highly discouraged. They are an important
safety feature to protect against dangerous
chemical overfeeds and will protect the
equipment from running continuously if it runs
out of chemical.