Toro Micro-Master Series User Manual page 80

Micro-Master Touch User Guide
Filter Bank Parameters
Chemical Injection Pause
Each filter bank has an option to suspend chemical injection when a filter backwashing cycle is in
progress. This can be useful to prevent the emission of chemicals in the filter waste water outlet.
Initial Pressure Differential Delay
Delay before the controller will look at the PD Sensor
When an irrigation cycle commences, the Initial PD Delay is an adjustable time period before the
controller looks at the PD switch to see if a filter cycle is requested. This is to allow the system
sufficient time to stabilize before a flushing cycle commences, as further initial de-stabilization may
result from a premature filter cycle actuation immediately after pump start. The contacts from the PD
switch must remain closed for the duration of Delay 1 Time specified in the switch sensor. This is to
prevent false filter operation during irrigation when the pressure may vary during station change over.
Filter Cycle Delay
Minimum Time between Filter Flushing Cycles.
This is the delay time between filter back-flush cycles. It acts in conjunction with the PD switch and
effectively delays a Pressure Differential induced flushing sequence for a period of time to allow
system stabilization after the completion of a back-flush Cycle. A typical minimum delay might be 5
minutes when a PD switch is used.
P.D. Switch Backup Delay
Max. Time between Filter Flushing Cycles.
A filter program cycle is started if an unusually long time has elapsed between Pressure Differential
initiated back-flush cycles.
Each Filter Bank has a backup timer which will actuate in the event of PD switch failure. If a filter
backwash cycle is required on a regular time interval, then the time between the end of one filter
cycle and the start of the next is given by the sum of the Filter Cycle Delay and the PD Switch
Backup Delay.
Filter Inter-Station Delay
This is the time delay between a filter station switching off and the next filter station switching on. A
time between 0 to 99 seconds may be entered. This allows time for the system to stabilize before
back-flushing the next filter.
The interaction between the delays described above is shown in the next diagram.
© 2014 Toro Australia Pty Ltd 72 Ver 1.2, June 2014