Instruction manual

68
Cycles Measured
(only appears if a makeup conductivity input card is installed or type of bleed is based on cycles
of concentration)
This displays the current cycles of concentration of the cooling tower (the ratio of the system
conductivity to the makeup conductivity).
Current Makeup Source
(only appears if type of bleed is based on cycles of concentration, 2 or 3 makeup sources)
This menu displays the current makeup water source, as determined by comparing the makeup
conductivity to the ranges set up for each makeup water source. If it indicates “N/A”, then the
makeup conductivity measured is not in any range defined for a makeup water source.
Current Set Point
(only appears if type of bleed is based on cycles of concentration, 2 or 3 makeup sources)
This menu displays the set point currently being used. When the makeup water source changes, the
set point transitions from the last source’s value to the new source’s value over the retention time.
After the retention time has past, the set point will stay at the new value until the makeup water
source changes again. If the set point value is “N/A”, this means that the makeup conductivity
measured is not within any defined range for a makeup source.
Current Dead Band
(only appears if type of bleed is based on cycles of concentration, 2 or 3 makeup sources)
This menu displays the current dead band being used. This will transition from one value to
another over the retention time.
Current Cycles High/Low Alarm
(only appears if type of bleed is based on cycles of concentration, 2 or 3 makeup sources)
These menus display the current values for the cycles low and high alarms, which also change over
the retention time.
Retention Time Remaining
(only appears if type of bleed is based on cycles of concentration, 2 or 3 makeup sources)
This menu shows how much time is left before the transition from one set point to another is
complete.
Retention Time of Tower
(only appears if Type of Bleed is Based on Cycles of Concentration, 2 or 3 makeup sources)
Type in the text box the hours and minutes it takes for one makeup water source to replace the
previous water (under normal loading conditions). The controller will not change set points
immediately upon detecting a new water source. It will use the programmed retention time to
gradually transition from one set point to the other.
Set Point
(only appears if Type of Bleed is Based on System Conductivity or Other 4-20 mA input 4)
Type in the text box the conductivity (or ppm) value at which you want the bleed valve to open.
Any value between 0 and 10,000 is acceptable (if based on conductivity). If the control mode is
based on a 4-20 mA input, then the set point value is limited to the range of the 4-20 mA input.
Click on the link called Scaling to set the range of the 4-20 mA input.