HE 5750 Operating Instructions
#371627 | Version 1.1
13
4 Sketch of filter system
Filter system
4.1 Glossary
Valve sequence
A valve offset of 2 causes:
valve 1, valve 3, valve 5 ... are triggered
Chamber sequence
A chamber offset of 1 causes:
chamber 1, chamber 2, chamber 3 .... are cleaned. A
chamber offset has higher priority than a valve offset.
A chamber offset of 0 causes:
all valves acc. to valve sequence in chamber 1 are
pulsed. Then chamber 2 and so on...
Operating modes:
permanent
Permanent processing of the parametrised valve
sequence. Control via start / stop signals.
dp threshold
Control of the cleaning process via the dp signal.
Cleaning starts when the parametrised upper
threshold is exceeded; stops when dropping below
lower threshold.
dp controller
dp signal and flow rate signal influence the cleaning
process. Depending on the filter characteristic to be
set via interpolation points, the pause time is
controlled or regulated.
Online cleaning
The dampers for pure gas and raw gas stay open
during cleaning.
Offline cleaning
During cleaning of a chamber, the selected dampers
are closed. Within the chamber the valve sequence is
applied. After chamber cleaning, the chamber
sequence is considered.
Semi Compartment Offline Cleaning (SCOC)
‘Semi Compartment Offline Cleaning’. Requires two
pure gas dampers per chamber. Thus, one half of the
chamber can be cleaned offline, while the other half
remains in the filter process.
Post-cleaning
Post cleaning may be required if the complete filter
has been taken out of the process. The post-cleaning
extends over the complete filter and performs the
parameterised number of cycles / valves, etc..
The post cleaning uses ‘cycletime 2’.
Background cleaning
The background cleaning becomes active if no
‘regular’ cleaning is performed for a parameterisable
time.
This is often the case in small flow rates or low dust
inputs.
The differential pressure is reviewed regarding a mini-
mum value at the same time. If the value falls below
this, it is assumed that there is no fan operation and
cleaning will not continue.
