Pentair AK110 - Section 8; Utility Passwords 9000-9020; Set-Up Digital Flow; Proportional Feed

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ACU-TROL
®
AK110 Chemical Controller Installation and User's Guide
SECTION 8
APPENDIXES
Utility Passwords 9000-9010
From the Main Status screen press [4] to enter the password screen.
 9001– Enteroncefor1-seconddatarecordingrate.Enterasecondtimefor5-minutedatarecordingrate.
To go back to the default 2-hour recording sample rate, power the unit off and then back on.
 9003– Whenin“CalculatedPPM”mode,showstheactualORPandtheadjustedORPderivedfrom 
Calculated PPM calibrations.
To use Switch 1 or Switch 2 as a digital flow switch you must first set it up in the flow switch set-up screen. To enter
the setup screen from the MAIN SCREEN, move the cursor to the switch “S” to be setup and press ENTER. Enter the
number of pulses per gallon from 0 to 999.9. NOTE: Switch 1 is the default flow switch for relay control and should not
be used for digital flow if switch 2 is available.
To clear the total accumulate flow counter, place the cursor to CLEAR and press ENTER.
Set Up Digital Flow
The proportional feed value determines the ratio of feed ON time in a cycle. The general principle is that a relay should
beonforareducedamountoftimeasitnearssetpointsoastominimizechemicalfeedovershoot.Alagtimeexists
between the time the chemical feeds and the sensors "read" the new values. Older Controllers would have a relay on
continuouslywhichcanleadtosignicantovershootingofthechemicalfeed.TheControlleradjusttheratiobasedon
howfarfromthesetpointisfromthemeasurement.Thefollowingtablesshowsexamplesoffeedtimesforvarious
conditions:
Proportional Feed
Table 3. ORP Control with the Cycle Time control type.
Cycletime=6minutes
700 630 10% 00:06:00 00:00:00 00:06:00
700 631 10% 00:05:54 00:00:06 00:06:00
700 698 10% 00:00:06 00:05:54 00:06:00
700 665 10% 00:03:00 00:03:00 00:06:00
700 100 10% 00:05:06 00:00:54 00:06:00
700 699 10% 00:06:00 00:00:00 00:06:00
Set
Point
Measurement
Prop %
Actual On
Actual Off Cycle