9
Donaldson Company, Inc.
Delta P Plus Control
The Torit Delta P Plus Controller monitors the differential
pressure between the clean and dirty air plenums,
providing a visual display of the filter condition. It
controls the pressure drop by turning the cleaning
mechanism On and Off at the chosen limits. There are
three (3) set points: High Pressure On, Low Pressure
Off, and Alarm. The first two, High Pressure On and Low
Pressure Off, control the filter cleaning system. The third,
Alarm, provides a relay output to activate an external
alarm supplied by others.
The user can program the Delta P Plus Controller
to pulse while the collector is running to maintain a
relatively constant pressure drop across the filters, pulse
only after the collector is shut down (after-shift cleaning),
or a combination of both, cleaning while running as well
as end of the shift.
For complete information, see the most current version of
the Delta P Plus Installation, Operation, and Maintenance
manual.
Delta P Plus Control Display
24VDC Motor Start with Feedback Relay
The 24VDC start relay allows a customer supplied
piece of equipment to start the dust collector. This is
accomplished by the customer’s equipment sending
a 24VDC signal to the collector controller which then
activates the fan and pulsing systems. The low voltage
feedback relay allows the dust collector controller to
interlock with other customer supplied equipment by
relaying the low voltage signal back to the sending
equipment. The feedback occurs when the collector is
running.
External Remote-Mounted Controls
Remote mounted controls are required when the
collector is reinforced, the collector is being installed
outdoors, or if particulate sensing or airflow control is
required. Similar to the integrated controllers, the Torit
Delta P and Delta P Plus are the options for pulse control.
Locate the control panel as close to the collector as
possible to minimize the length of tubesheet differential
pressure tubing.
Particulate Sensor
The particulate sensor constantly samples the clean air
exhaust air stream when the collector is on. In instances
where a filter leak is detected the controller will stop the
fan and pulsing, and turn on a visual warning beacon.
Airflow Controller
The airflow controller is used to maintain a constant duct
static pressure loss, thus a constant air volume through
the duct system. It compensates for variations in filter
pressure drop such as during startup with new filter
packs when the filter pack resistance is low, or towards
the end of a filter pack’s life when the pressure drop is
higher.
The airflow controller varies the speed of the fan wheel
to adjust to the required airflow. An energy savings
can be realized when the application is not requiring
maximum power.
