Page 20
www.becs.com 9487 Dielman Rock Island Ind Dr, St. Louis, MO 63132
Operation and Maintenance Manual Rev: C17
A – 5.16: Recirculation Pump (continued)
A – 5.16.1: VFD Control (continued)
Set Point (Op): Allows you to set the value to
control to. (in % or flow rate depending on
what the control input is set to).
Dead Band (View Only): This option is only
shown if the Control Input is set to Flow Rate. The
VFD output will not change until the input is
this far away from the set point.
Backwash Output (View Only): This option is
only shown if the backwash control is configured. Sets
the VFD percent output to use when
backwashing.
Minimum Output (View Only): The
controller will always keep the VFD output
above this % except when the relay is off.
A – 5.16.1.1: Scheduled Turndowns
Scheduled turndowns will override the regular
set point at their scheduled times.
If two scheduled turndowns overlap,
turndown 1 has the highest priority; turndown
2 has the second highest priority, and so on.
Once the highest priority turndown’s
scheduled time ends, the next highest active
turndown’s set point will be used until its time
ends or a higher turndown becomes active.
Cancel on alarm (Mgr): If a high or low
alarm for pH, ORP, Cl, temperature trigger,
or a high turbidity alarm triggers, a turndown
failsafe is triggered and all scheduled
turndowns are canceled until the failsafe is
cleared.
Heater/Ozone/UV turndown modes
(Mgr):
Each control has two modes available:
Minimum Flow Rate – scheduled
turndowns will adjust their targeted flow
rate to ensure the flow rate is above the
equipment’s minimum flow rate before
the equipment is allowed to run.
If an input wants to activate the control
during the turndown, the input must
remain above/below the set point for five
minutes before that feed is enabled. Then
if the flow rate is below the equipment’s
minimum flow rate, the flow rate is slowly
raised to a rate just above the minimum
flow rate. Only once the flow rate is
above the minimum flow rate for that
equipment will that control be allowed to
run.
If the control is already active when the
turndown starts and the turndown’s set
point is lower than the equipment’s
minimum flow rate, the controller will
slowly decrease the flow rate to a point
just above the equipment’s minimum flow
rate instead of the turndown’s programed
flow rate.
Normal Operation – the feed will shut
off if the flow rate drops below the
programed minimum flow rate.
A – 5.16.1.2: Manual Turndowns
Manual turndowns are configured here but
are triggered from the main menu.
Manual turndowns override the normal and
scheduled set points.
There are four manual turndowns available.
Each manual turndown has the following
settings:
Duration (Op): Sets how long the manual
turndown will run. Must be set to non-zero
for the turndown to show up on the main
menu.
Set Point (Op): Sets the type of set point
(% out or flow rate) and the value to control
to for the manual turndown.
Label (Op): Allows you to change the name
of this manual turndown. There is a 12
character maximum.
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