8
NOTE: Will trip Low Set Point Alarm if reading or Set Point becomes lower.
2j. High Set Point Limit.
(xxxx)
NOTE: Will trip High Set Point Alarm if reading or Set Point becomes higher.
2k. Res Dead Band.
(xxxx) (This is in PV2 units)
NOTE: Controller will set a dead band this amount above and below set point. As long as the signal
is within this dead band the HC-220 will consider it to be on set point.
2l. Select Integral Value.
(xxx) (%) (0.0 to 100.0) (Default value 10.0)
NOTE: Value used in Residual and Compound Loop calculation for control. This controls the
magnitude of each adjustment. If the value is too high then the residual will overshoot the set point.
If it is too low then the residual will never reach the set point.
2m. Residual Lag Time.
(xxxx)
(seconds)
NOTE: Lag time for obtaining accurate Residual/ORP readings after feed changes. The HC-220 will
make residual adjustments only once per lag time (1-1800 seconds).
3. Compound Mode Only:
3a. Flow Stop.
(xx)(%)(0 to 99%)
Used only in Compound Loop Control to prevent output adjustment based on the residual set point
when water fl ow has stopped. This feature allows the operator to enter a PV1 (Flow) value below
which the HC-220 will zero its output.
3b.
Residual
Reset
Value.
The residual reset value allows you to set a Flow/PV1
value (0-100% Flow/PV1 full scale) below which the residual signal will be ignored. When the
Flow/PV1 value rises above the entered value, the unit will automatically resume considering the re-
sidual signal.
NOTE: This feature is for use in Compound Loop Control only. This feature is included in units
shipped after January 2009.
3c. Fixed or Variable Lag Time.
Selecting Fixed lag will keep the lag time constant at
all times. Selecting Variable lag will cause the program to constantly adjust the lag time based on the
current fl ow value and the Flow at Variable Lag Time Parameter. (Variable lag time increases as fl ow
decreases.) Two variable lag types are available. Single point variable lag is ok for systems with small
variations in fl ow rates, but two point variable lag should be used for systems with a big variation in
water fl ow rates (more than 2:1 change in fl ow).
3d. Maximum Lag Time.
Default/Max. Allowable is 1800 sec./30 min.
3e. Flow at Variable Lag Time.
Actually time the lag time and enter the average value
for the Flow Meter in units above during this test. The HC-220 will then scale the lag time according
to changes in the Flow input signal.
4. Display of Chemical Feed Rate (Linearized):
(Purpose) Calibrate for display purposes.
4a. Choose Output Units
.
%, PPD, GR/H, KG/H, GPH, GPM, GPD, LPM, LPH
4b. Choose Decimal Position.
0, 0.0, 0.00, 0.000
4c. Choose Full Scale Value.
xxxx
NOTE: If in Set-Point (RES) or Compound Loop Control Mode, PO1 units must be set to a minimum
of 3 integers. If PO1 Full Scale is set to a number less than 100, one decimal position must be used.
5. Chemical Feed Type (Accounts for opposite effect of SO
2
and Cl
2
on Res/ORP/pH):
5a. Select Chemical Type.
(Cl
2
– If it has positive effect on Res/ORP/pH)
(SO
2
– If it has negative effect on Res/ORP/pH)
