Table of Contents
Advertisement
Operation
The STR2-6 timer sequentially activates internal solenoid valves based on the on and
off timer settings. These valves are connected to the primary diaphragm valves on the
filter with ¼" od tubing.
The controller has two 43650 DIN connectors. One connector is for power and ground
and the other is for differential pressure control and initiating the shut down cycle. The
power connector has three prongs for line, neutral and ground. The other connector
has four prongs. Prong 1 and 2 initiate the shutdown cleaning cycle when closed.
Prongs 3 and 4 connect to a pressure switch.
On demand cleaning is controlled with a differential pressure switch such as a Dwyer
photohelic gauge. When contacts 3 and 4 are closed the controller stops pulsing.
Opening the contact will initiate cleaning based on the timer settings. Cleaning
continues until the low pressure set point is reached on the pressure gauge and the
contacts are closed.
The shutdown cleaning cycle is activated by closing contacts 1 and 2. When closed the
controller will fire all solenoids 5 times and then go dormant. This contact is normally
tied to the fan start up. The contact must open on start up or the controller will not start.
The shutdown cleaning cycle can be activated or deactivated through the setting of dip
switch SW#1:
SW#1=ON The shutdown cleaning is deactivated
SW#1=OFF The shutdown cleaning is activated
The shutdown cleaning cycle overrides the on demand cleaning input. The following
chart illustrates the control states for these functions.
SW#1
On
Off
When the cleaning cycle is interrupted and then resumed the controller starts at the next
sequential output. This occurs even if power is lost.
Shutdown Cleaning input
----
----
Closed
Closed
Open
Open
On Demand Cleaning Input
Open
Closed
Open
Closed
Open
Closed
Status
Cleaning initiated
Cleaning stopped
Shutdown cycle starts
Cleaning initiated
Cleaning Stopped
Advertisement
Table of Contents
