Donaldson Torit Delta P Plus Installatie- en bedieningshandleiding - Pagina 4

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Donaldson Torit Delta P Plus Installatie- en bedieningshandleiding
Donaldson Company, Inc.

Description

The Delta P Plus controller continuously monitors and
displays differential pressure drop in inches of water
or decaPascals on the panel face. When combined
with a pulse timer, it can control the collector cleaning
mechanism to maintain the differential pressure drop
between chosen limits. Three cleaning modes are
available along with an alarm function and a 4 – 20 mA
signal output.

Operation

Three cleaning modes, Differential Pressure Cleaning
(DFF), Downtime Cleaning (DTC), and Combined
Differential and Downtime Cleaning (ALL) are available
with this controller and can be individually chosen by the
user.
•
Differential Pressure Cleaning (DFF) - When the
differential pressure drop reaches the controller's
HIGH setpoint, the controller closes an output relay
initiating the cleaning cycle. When the differential
pressure drop reaches the LOW setpoint, the relay
opens and the cleaning cycle stops. This sequence
continues as long as the collector is running,
maintaining the differential pressure drop within a
specified range.
•
Downtime Cleaning (DTC) – The Delta P Plus
controller monitors for the differential pressure drop
to exceed the LOW setpoint. (Indicates the blower
has been started). When the differential pressure
drop later approaches zero (indicating the blower
has been shut down), the Delta P Plus engages
the cleaning cycle for a pre-selected time. A delay
timer allows the blower to come to a stop before the
cleaning cycle starts.
The delay timer and cleaning cycle durations are
both user adjustable but password protected.
•
Combined Differential and Downtime Cleaning
(ALL) –The ALL mode combines the two functions
described above, maintaining the differential
pressure drop in a specified range, then initiating
a down-time cleaning cycle when the differential
pressure drop approaches zero. The downtime
cleaning function can be toggled on or off from the
keyboard.
1
Note: The DTC and ALL cleaning modes incorporate
compressed air cleaning of the filters when the
main collector fan is not running. This may result
in collected material "drifting" out the inlet duct
of the collector. An isolation valve in the inlet
duct of the collector can reduce or eliminate that
drifting.
Consideration should be made on the use of the
DTC or ALL cleaning mode on small collectors
where the relatively low volume of the collector
may produce pressure spikes with each pulse of
the cleaning cycle. Such pressure spikes may
accelerate the fatigue, or damage of ancillary
items such as pressure sensors or explosion
relief panels.
Alarm
The alarm is used to indicate that the differential
pressure drop has exceeded a preset value. The alarm
setpoint is set to a value exceeding the HIGH setpoint
used to start the filter cleaning cycle. The purpose of the
alarm is to notifie the user, via a light on the panel or dry
contact output, that the cleaning system cannot reduce
the pressure drop possibly due to a cleaning system
failure, lack of compressed air, or the end of the filter's
useful life. It can also be used to notify the user that
the pressure drop has reached a certain value (process
related). There is a time delay prior to activating the
alarm to prevent nuisance trips of the alarm. The Delta
P Plus Control also provides an input connection for a
remote alarm reset/disable.
Note: Once the differential pressure drop reaches the
Alarm value, the relay and LED remain activated
until the pressure drop falls below the value set
for the HIGH set point or until you deactivate the
alarm using a remote reset/disable.