Feed (A Or B) Menu - Walchem WDT400 Series Instruction Manual

5.5

Feed (A or B) Menu

The Feed Menu adapts to the selected Feed output mode.
Hint: For easiest programming, program Feed Mode first, then step through the rest of the feed
parameters.
The modes are defined as follows:
A Bleed and Feed with Optional Lockout
B
C
D Feed based on Water Contactor Input
E Feed based on Paddlewheel Input Mode
Feed A
Feed A
Feed A
Feed A
Feed A
Bleed and Feed
Mode
Feed % of Bleed
Mode
Feed % of Time
Mode
Feed Based on
Water Contactor
Mode
Bleed and Feed Mode turns the Feed output On and Off at the same time as the
Bleed output. The lockout setting determines the maximum allowable time for
the Feed output. If this time is exceeded the Feed output is turned off and
Locked out until the Bleed output turns off.
Feed % of Bleed Feed % of Bleed Mode tracks the length of time that the Bleed output is on.
When the bleed turns off the feed output is energized for a user defined
proportion of the bleed time.
Feed % of Time Mode turns on the Feed output for a user definable % of a
Feed % of Time
timed cycle. The time cycle length is adjustable from 10 to 60 minutes.
Feed based on Water Contactor Input Mode turns on the Feed output for a user
definable time each time a water contactor pulse is detected. This contactor
input can be divided to accommodate a large variety of water meters. Contacts
will accumulate feed time so that all contacts are accounted for.
Turns on the Feed output for a user definable time each time a defined volume
of flow is detected. This paddlewheel input has a programmable K Factor to
work with a large variety of Hall Effect (square wave, not sine wave) flow
meters.
OFF Indicates that the Feed output is currently OFF.
10:00 Indicates the length of time that the Feed output has been ON or the length of time that the
Feed output will be ON.
NO FLOW Indicates that Feed control has been suspended because there is presently no flow past the flow
switch.
TIMEOUT Indicates that the feed lockout timer in the Bleed and Feed mode has expired.
LOCKOUT Indicates that the output is currently locked out due to a biocide add or biocide lockout.
Lockout
Set this for the Feed Lockout Time. The lockout time is the maximum length of time that the feed output
can be on. If the lockout time is set to 0:00, the lockout timer is no longer used and the feed output will be
on for as long as the bleed is on.
% of Bleed
This is the % value that is multiplied times the accumulated bleed time to determine how long the feed
will be. For example, if the bleed was on for 10 minutes and this setting was 50%, the feed output would
be on for 5 minutes.
Max Time
This is similar to the lockout time above in that the feed output will not exceed this maximum length.
% of Time
This is the % value that is multiplied times the cycle length to determine the length of time that the feed
output is ON. If the cycle length were 10 minutes and this setting was 40%, the feed output would be on
for 4 minutes, then off for 6 minutes and then repeat the cycle.
Cycle Time
This determines the length of the cycle to be used.
Time/Cont.
(Time per contact.) This determines the length of time that the feed pump should be on for each contact that
is received.
÷ Contacts By
This setting allows a divider to be entered. The divider will count actual contacts from the meter until the
setting is reached before a contact is considered to be received. For example, if the divider is set to 10 and
the Time/Cont is set to 5:00, then the feed output would turn on for 5:00 minutes after 10 contacts were
received.
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