Walchem WDB400 Series, Инструкция по эксплуатации

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5.5 Auxiliary Menu
The Auxiliary output may be used either to control a chemical feed pump or as an alarm.
When setting up the controller for the first time, the Output Mode should be selected first. Press
ENTER
at the Aux menu, scroll to the Output Mode menu and press
ENTER
again . To change the output mode,
press
ENTER
again and use the UP or DOWN arrow keys to toggle between "Feed" and "Alarm." Press
ENTER
when the correct choice is displayed.
5.5.1 Feed (A or B) Menu
This menu only appears if the Auxiliary output mode is set for "Feed."
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 12.
A Blowdown and Feed with
Optional Lockout
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
output. If this time is exceeded the Feed output is turned off and Locked out until the
Blowdown output turns off.
B Feed % of Blowdown
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.
C Feed % of Time
Feed % of Time Mode turns on the Feed output for a user definable % of a timed cycle. The
time cycle length is adjustable from 10 to 60 minutes.
D Feed based on Water Contactor
Input
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.
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
OFF
Indicates that the Feed output is currently OFF.
Feed A
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.
Feed A
TIMEOUT
Indicates that the feed relay has been on longer than the programmed maximum time.
Feed A
NO FLOW
Indicates that Feed control has been suspended because there is presently no flow past the flow
switch.
Blowdown and
Feed Mode 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.
Feed % of
Blowdown Mode
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.
Feed % of Time
Mode
Cycle Time
This determines the length of the cycle to be used.