Donaldson Torit Delta P Plus Руководство по установке и эксплуатации - Страница 4

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Donaldson Torit Delta P Plus Руководство по установке и эксплуатации

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.

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.