Feed Menu - Walchem WBL400 Series Instruction Manual

5.5

Feed Menu

The Chemical Feed Menu adapts to the selected Feed output mode.
Note: When programming the unit for the first time, it is recommended that the Chemical Feed Mode
Menu be chosen first, then step through the rest of the Feed Menu indicated in Figure 11. The modes
are defined as follows:
A Blowdown and Feed with
B Feed % of Blowdown
C
D Feed based on Water Contactor
E Feed based on Paddlewheel Input
The Feed menu will be indicated on the display by one of the following: (The 'A' indicates that the
feed is being controlled automatically.)
Feed A
Feed A
Feed A
Feed A
Blowdown and
Feed Mode
Feed % of
Blowdown Mode
Feed % of Time
Mode
Blowdown and Feed Mode turns the Feed output On and Off at the same time as the
Blowdown output. The lockout setting determines the maximum allowable time for the Feed
Optional Lockout
output. If this time is exceeded the Feed output is turned off and Locked out until the
Blowdown output turns off.
Feed % of Blowdown Mode tracks the length of time that the Blowdown output is on. When
the blowdown turns off the feed output is energized for a user defined proportion of the
blowdown time.
Feed % of Time Mode turns on the Feed output for a user definable % of a timed cycle. The
Feed % of Time
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
Input
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
Mode
Hall Effect (square wave, not sine wave) flow meters.
Indicates that the Feed output is currently OFF.
OFF
Indicates the length of time that the Feed output has been ON or the length of time that the
10:00
Feed output will be ON.
Indicates that the feed relay has been on longer than the programmed maximum time.
TIMEOUT
Indicates that Feed control has been suspended because there is presently no flow past the flow
NO FLOW
switch.
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 blowdown is on.
% of Blowdown
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.
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