Page 11
9487 Dielman Rock Island Ind Dr, St. Louis, MO 63132
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Operation and Maintenance Manual
Rev: L13
A – 5.2: Chlorine Control
After entering the Control Outputs option, select
the Cl Control from the menu. This will allow the
programming of the following:
Sanitizer Chemical (Op):
Sets the sanitizer
chemical name (Chlorine or Bromine).
This option controls what chemical name the
controller displays for the Cl inputs and the
primary sanitization/oxidizing chemical.
Control Input Src (Op):
This option is only available
if the free Cl Input source is set to Calculated or Probe.
Choose between ORP and free Cl to use as the
primary control input for the sanitizer feed.
If the free Cl Input is selected and the free Cl
Input source is set to probe, ORP is still used
for control while the free Cl interlock timer is
running.
If the free Cl Input is selected and the free Cl
Input source is set to calculated, the controller
still controls off of ORP, but the ORP set
point is calculated by the controller based on
the free Cl set point, the pH set point, and the
free Cl calibration. Modification of any one
of those three values will result in a new ORP
set point.
Control Type (Op):
Choose from On/Off or
Time Base Proportional control.
In general, if you are using a motor driven
chemical feeder then you should choose the
On/Off option. If you are using a solenoid
driven or pulsed diaphragm chemical feeder
(such as Pulsatron, most LMI models or most
Prominent Models), you should choose the
TBP option. This feature helps to hold a set
point and to minimize over-shoot by making a
standard feeder mimic the action of more
sophisticated modulating feeders.
If you choose the On/Off option, then the
controller will activate the chemical feeder
whenever the ORP falls below the set point
and continue to feed until the ORP rises
above the set point plus hysteresis at which
point it will stop.
If you choose the TBP option, then the
controller will activate the chemical feeder
whenever the ORP falls below the set point
and will feed for a percentage of the Time
Base (default one minute) proportional to the
offset from set point. For the remainder of
the Time Base the feeder will be paused. The
feeder will continue this feed and pause cycle
until the controller achieves the set point plus
hysteresis. The closer to set point, the less
time the feeder is ON.
ORP Set Point (Op):
This option is NOT shown if
the Control Source is set to free Cl and the free Cl Input
source is set to Calculated.
This value sets the desired
level to maintain the ORP at.
ORP Span/Prop. Bnd (Op):
This option is only
shown if the Control Type is Time Base Proportional and
the ORP Set Point is shown above.
This value sets the
distance (or span) from the set point that the
output will be proportionally controlled.
Free Cl Span/Prop Bnd (Op):
This option is only
shown if the Control Type is Time Base Proportional, the
Control Source is set to free Cl, and the free Cl Input source
is set to probe.
This value sets the distance (or span)
from the set point that the output will be
proportionally controlled.
Free Cl Set Point (Op):
This option is only shown if
the Control Source is set to free Cl.
This value sets the
desired level to maintain the free Cl at.
Free Cl Ctrl Hyst (Rep):
This option is only shown if
the Control Source is set to free Cl and the free Cl Input
source is set to probe.
This value sets the amount the
input must rise above set point before the feed will
shut off.
Time Base (Op):
This option is only shown if the
Control Type is Time Base Proportional.
This sets the
total time that control is based on. During this
time, the feeder will turn on for a percentage of
the Time Base and turn off for the remainder.
Warning: Increasing or decreasing the time
base may cause the feed to severely overshoot
or never achieve set point. Adjust this option
only when recommended to do so by a factory
representative.
Warning: Increasing or decreasing the
proportional band may cause the feed to
severely overshoot or never achieve set point.
Adjust this option only when recommended to
do so by a factory representative.