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:
To Next Page
Loading...
Need help?
General
