Filter Cleaning Valve Function; Maintenance; Empty The Collector Bin; To Replace The Plastic Bag - Nederman FlexPAK Manuel De L'utilisateur

8.4 Filter cleaning valve function
EN
The PLC output DO3 is set and sends +24 V to the
solenoid valve. The solenoid valve opens the air flow
to the pneumatic piston, which moves the lid on top
of the filter upwards letting in the air with atmospher-
ic pressure to the filter top. This sudden opening of
the lid on the top lets in the air with great speed which
creates a sudden pressure rise above the filters. The
pressure increase blows air through the filter bags re-
moving the dust from the filters.
When power to the solenoid valve disappears, the
valve closes and evacuates the pneumatic piston. The
lid falls down and closes the opening of the filter top.
If the piston does not fall down, the piston may not
evacuate properly. If the incoming compressed air is
disconnected, the piston should fall down allowing
the lid to close the filter top opening.
9 Maintenance
Read Chapter 9 Maintenance
maintenance work.
Maintenance work means that the equipment will
have to be opened and possibly dismantled. This may
constitute a risk and the maintenance personnel need
to know about the risks that may occur when acting
incorrectly.
WARNING! Explosion risk
Stop operation and clean the entire filter thor-
oughly from dust before any grinding, welding
or other hot works are performed on the filter
exterior or inlet.
For more information, see the Installation and
Service manual.
WARNING! Risk of personal injury
• Always use an approved breathing mask,
goggles and gloves when replacing the dust
sack and other work that involves exposure
to dust.
• The motor, fan and air duct may become very
hot during operation.
• Use ear protection when the unit is in opera-
tion and work is carried out in the vicinity of
the upper section of the dust collector.
• Always disconnect the supply voltage with
the maintenance switch before any service,
whether mechanical or electrical.
• Always lock the maintenance switch in the
off position and, if possible, secure it with a
padlock.
• Always disconnect the compressed air sup-
ply before any service, whether mechanical
or electrical.
30
FlexPAK
before carrying out any
CAUTION! Risk of equipment damage
During maintenance, it may be necessary to re-
move the acoustic enclosure over the motor
while the motor is in operation. Take care to
prevent objects from falling down into the mo-
tor cooling fan.
Contact Nederman if the frequency converter
needs service.
The unit is CE-marked. Connections to the unit,
initial start-up and maintenance are to be car-
ried out according to the product manuals.
9.1 Empty the collector bin
WARNING! Explosion risk
Never use the unit without a plastic bag.
WARNING! Risk of personal injury
• Ensure that there is no vacuum in the dust
separator before removing the collector bin.
• Crush hazard. Be careful when lowering and
refitting the collector bin. Use proper pro-
tective equipment.
• Wear goggles, a dust mask and gloves when
emptying the collector bin.
CAUTION! Risk of equipment damage
Use only Nederman original spare parts and ac-
cessories.
The plastic bag is to be replaced when filled up
to 2/3, see Figure 11.
9.1.1 To replace the plastic bag
1 Check that the risk area is clear.
2 Ensure that there is no vacuum in the dust separ-
ator.
3 Remove the collector bin.
4 Seal and remove the plastic bag. Use a cable tie or
equivalent, see Figure 12.
5 Fit a new plastic bag in the collector bin, see
ure 13.
6 Refit the collector bin onto the dust separator.
7 Check that the pressure equalizer hose is attached
to the collector bin, see Figure 14.
8 Check that the collector bin seals properly once
the vacuum is re-applied to the dust separator.
9.2 Filter package
Fitting the steel ring correctly is important to
maintain the tightness and durability of the
unit.
Filter replacement is to be noted in the service pro-
tocol of the unit. Replacing individual filter bags is
possible, but it is recommended that the whole filter
Fig-