21
20
If the
CONT/PAUSE
switch of the Circulation pump is in
CONT
position, the circulation pump will act as described
above.
If the
CONT/PAUSE
switch of the Circulation pump is in
PAUSE
position, the circulation pump will not run the step 5.
When the low-level sensor is not used, the low-level condition is not sensed
by the controller. The user must take care to stop the user input com-
mand before the water in the tank goes below the low level.
When the high (alarm) level sensor is not used and
the normal level sensor does not work properly, the
controller is unable to detect when the water reaches
the high (alarm) level. In order to stop the control-
ler, the humidity sensor must be placed where it can
sense if the water pours down from the tank.
If the tank assembly is minimal, the irrigation takes place without using
the user input command. Only the normal level and humidity sensors are
used. The controller fills the tank at normal level and begins the Conduc-
tivity & pH correction. The user can add water at any time or wait until
a good water composition is signaled.
Step 4
:
The water nozzle is closed, circulation pump is running and the Conduc-
tivity & pH controls are activated. The Conductivity control has the
priority over the pH control.
• If the timer feature is activated, the control is on for a selected period
(1-10 minutes) and off for the remaining period until 15 minutes.
• If both the conductivity and pH values are good for at least 30
seconds, the controller goes to step 5.
• If the normal level sensor remains open for about 15 minutes, the
controller goes back to step 3.
Step 5
:
The Conductivity & pH values are good. The Circulation pump is running
and the controller waits for user input. This state is signaled on the front
panel by
FEED OK
LED and externally through a 15mA current between
the
FEED OK
and
INPUT COMMON
pins.
• If the water composition is not good, the controller goes back to step 4.
• If the normal level sensor remains open for about 15 minutes, the
controller goes back to step 3.
• If the FILL button (or the external fill button connected between
FILL
and
INPUT COMMON
) is pressed while the
NORMAL LEVEL
sensor is
open, then the controller goes back to step 3.
• If the user input command is active (the contact is closed between the
USER INPUT
and
INPUT COMMON
pins), the controller goes to step 6.
Step 6
:
The Feeding pump is activated. The control of Conductivity and pH is
inhibited.
• If the user input becomes inactive (the contact between the
USER
INPUT
and
INPUT COMMON
pins is open), the controller goes back
to step 3.
• If the low level is reached (the low-level sensor contact is open), the
controller goes back to step 3.
• If the water remains under normal level for about 15 minutes (the
normal level contact is open), the controller goes back to step 3.
The tank can also be filled by pressing the
FILL
button on the front panel
(or the external fill button connected between
FILL
and
INPUT COMMON
pins) when the irrigation is completed.
