Automatic Backflush Filter F450
State:
05.02.2016
– 1.3
Georg Schünemann GmbH, Bremen
4-7
4.6
Testing and adjusting of the operating parameters
Implement the following steps, in order to check the proper function of the filter.
4.6.1
Switch on control with the power switch, first flushing phase/pre-flushing
check
By activating the power switch the control automatically switches into filtration
operation (default setting). Through pressing the key Spülen/Flush the dirt drain
valve opens against "atmosphere-pressure" and/or around at least 8.7 psi (0.6
kg/cm
2
g) for lower system pressure (consider pressure losses of the piping). Dur-
ing the first flushing phase the flushing disc is located in the initial position in the
upper region of the filter housing.
Possibly necessary settings:
1.
Adjust the pre-flushing time T2 at the electronic control according to the filter
size if necessary (see Table 4-1).
2.
Adjust opening velocity of the dirt drain valve by means of throttles. Turn
throttles in clockwise direction slows down the opening.
Attention!
Opening to fast causes impacts in the pipes!
4.6.2
Setting the running time of the pneumatic cylinder to operating conditions,
second flushing phase / filtration
The current time must be adjusted absolutely at initial start-up locally, under re-
alistic operating conditions. This cannot be done in the factory!
In the second flushing phase the pneumatic drive starts to move down and the
flushing disc drives through the strainer insert. The proximity switches have light
emitting diodes, which indicate a reaching of the end point.
Setting the running time of the pneumatic cylinder (stroke of piston):
1.
Adjust the time for piston stroke of the pneumatic drive by means of com-
pressed air throttles present on the drive to the running time in accordance
with Table 4-1.
Too fast accomplishing of the strokes of the pneumatic cylinder affects the filtra-
tion negatively, because the strainer insert is moved through to fast by the flush-
ing disc.
2.
Control time for piston stroke T3:
Modification is only necessary if error message "STROKE ERROR" occurs.
The control time is preset by the manufacturer. Set control time for piston
stroke T3 in the control system only when time for piston stroke was
changed.
The control time specifies only the max. time (seconds) between start and end
of a piston stroke. If this time is exceeded a warning is given! The piston stroke
itself is set with the compressed air throttles (see item 1 in this chapter)!