30
From the
RELAY OPTIONS
screen press‖
3
‖
WATER METER
.
Select either
MTR1
or
MTR2
or
BOTH
as the trigger for the relay.
Use the keypad to enter the amount of flow before the relay is activated. Press ‖
ENT
‖.
Enter the amount of time that the relay will be activated. Press ‖
ENT
‖.
13.8.6
By percent of blowdown Time
Relays 2, 3, and 4 can be activated by a percent of the time that the blowdown was on. The relay will
activate after the blowdown shuts off. For example, if 50% is entered and the blowdown relay is on for
10 minutes, the relay will be energized for 5 minutes.
From the
RELAY OPTIONS
screen, press ‖
4
‖
PERCENT BLOWDOWN.
Use the keypad to enter a percent of blowdown time to activate this relay. Press ‖
ENT
‖.
13.8.7
By Percent of Time
The Percent of Time feature allows you to feed chemical strictly based by a percent of time. This relay
control scheme works in patterns of 20-second time blocks. A relay is on for some multiple of 20
seconds and off for some multiple of 20 seconds. Below is a chart showing how Percent of Time works
over a 400 second
example
.
x = 20 seconds on
- = 20 seconds off
==================400 seconds======================
0%
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5%
x -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
10%
x -
-
-
-
-
-
-
-
-
x -
-
-
-
-
-
-
-
-
20%
x -
-
-
-
x -
-
-
-
x -
-
-
-
x -
-
-
-
30%
x -
-
x -
-
x -
-
-
x -
-
x -
-
x -
-
-
40%
x -
x -
-
x -
x -
-
x -
x -
-
x -
x -
-
50%
x -
x -
x -
x -
x -
x -
x -
x -
x -
x -
60%
x -
x x -
x -
x x -
x -
x x -
x -
x x -
70%
x x -
x x -
x x x -
x x -
x x -
x x x -
80%
x x x x -
x x x x -
x x x x -
x x x x -
90%
x x x x x x x x x -
x x x x x x x x x -
95%
x x x x x x x x x x x x x x x x x x x -
100%
x x x x x x x x x x x x x x x x x x x x
A 400-second example is shown because it will cover the patterns of the major percentages. The
patterns for odd values such as 37% or 52% cannot be shown in a 400-second time interval but they
would look very much like those patterns shown for 40% and 50% respectively. In an extreme case
such as 99%, the relay would be on for 99 20-second blocks (1980 seconds) and then off for 1 20-
second block (20 seconds) and then on for 1980 seconds and off for 20 seconds etc.
To determine the total amount of chemical fed over a 24 hour period, multiply the percent of time by the
number of hours a day that your controller is operating, then multiply by your chemical pump flow rate
per hour.
For example:
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