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Operation and Maintenance Manual Rev: C17
A – 5.2: Chlorine Control
If your controller is configured to control
Chlorine, you will have the following options:
Sanitizer Chemical (Op): Sets the sanitizer
chemical name (Chlorine or Bromine).
This option controls what chemical name the
controller displays for the ppm Input and the
primary sanitization/oxidizing chemical.
Control Input Src (Op): This option is only
available if the controller is configured for ppm. Choose
between ORP and ppm to use as the primary
control input for the sanitizer feed.
If the ppm Input is selected and the ppm
Input source is set to probe, chlorine control
is disabled while the ppm interlock timer is
running.
If the ppm Input is selected and the ppm
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 ppm set point, the pH set point, and the
ppm 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 available
if using calculated ppm control. 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 Set Point (Op): This option is only shown if
the Control Source is set to ppm. This value sets the
desired level to maintain the ppm at.
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 ppm, and a ppm probe is installed.
This value sets the distance (or span) from the set
point that the output will be proportionally
controlled.
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.
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.
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.
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.
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