Nederman FlexPAK Manual Del Usuario página 34

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.
Read Chapter 3 Description
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.
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.
34
before carrying out any
• 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.
• Parts may be very heavy. Always use ad-
equate lifting equipment when handling
parts and consumables.
• Always use adequate safety measures when
performing work in an elevated position.
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 convert-
er needs service.
• The unit is CE-marked. Connections to the
unit, initial start-up and maintenance are
to be carried out according to the product
manuals.
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. Do
not use the emergency stop button as a substi-
tute.
• Ensure that there is no vacuum present in the
system during service.
• Always disconnect the compressed air supply
before any service.