Micro-Master Touch User Guide
71
© 2014 Toro Australia Pty Ltd
Ver 1.2, June 2014
12
Filter Banks
12.1
Overview and Operation
The Micro-Master Touch supports up to eight independently controlled filter banks. Each filter bank
can be used to control back-washing for up to eight separate filters, each with individual runtimes. A
filter bank can be activated in response to a pressure differential actuation or a regular time interval.
Each filter within the filter bank can be assigned to any station output located in any Remote Unit, or
to any of the four outputs on the front panel.
Each filter bank can be named and can be enabled or disabled for maintenance.
Filter Bank Operation
When a program starts, the allocated filter bank enters an Initial PD Delay. During this delay any
changes on the PD Input are ignored. This allows a period of time for the system to stabilise before
filter washing may be initiated. Following the Initial PD Delay, the filter bank enters a PD Backup
Delay. During this delay, a switch closure on the PD Input will start a filter back-wash cycle. If the
PD switch fails, the delay ensures that filter cycle will occur at regular intervals. When a filter cycle is
started, the filter bank will cycle through allocated filters, running each filter for the specified time. If
an Inter Filter Delay is specified, a delay is inserted between each filter activation. When all
allocated filters have been run, a filter cycle delay is started. During this delay, any switch closures
on the PD Input are ignored. This delay ensures that filter back-washing does occur continuously in
the event a short circuit develops in the PD Input wiring.
The filter bank operation is shown in Figure 48.
Idle
Initial
PD
Delay
Active
PD
Backup
Delay
Cyc
Delay
Program
Start
Program
Stop
Filter
Complete
Delay
Complete
Delay
Complete
PD Close
or Delay Complete
Figure 48 - Filter Bank Operation Schematic
