General Inspection; Main Filter Change; Control Filter Change; Tvfd Valve Operation - Nederman FlexFilter EX Manual De Instrucciones

17.4 General inspection

• Inspect the integrity of the dust separator, in partic-
ular, the steel clamping rings holding together the
housing/inlet/cone-modules.
• Check the integrity of the frame and all attach-
ments. Tighten bolts if necessary.
• Make sure the inside of the FlexFilter EX and the
connection pipes are free from deposits. A build-up
of deposits inside the piping system may cause a
discharge of static electricity.
• On Twin models, check the inlet pipe for wear. Re-
place the inlet pipe if the inner coating is worn out.
• Make sure the outside of the FlexFilter EX, and par-
ticularly the solenoids, sensors and connection box,
are free from dust layers.
• Clean the area around the FlexFilter EX and all areas
where the collected material is stored to ensure that
there are no dust deposits.
• Ensure that no combustible material is placed in the
risk area.
• Check that all signs/markings regarding safe opera-
tion are in place and that the personnel know about
them.

17.5 Main filter change

The filter bags should normally be replaced after
6000 hours of operation or when damaged. The filter
bags should also be replaced if the filter function is in-
sufficient. The HV Control Panel EX is fitted with a ser-
vice hour meter for recording service hours. Replace-
ment of filters should be registered in the Service pro-
tocol. Individual replacement of filter bags is possible
but replacing the whole filter package, including filter
panel and locking rings, is recommended as it is quick-
er and causes less spreading of dust.
Procedure
WARNING! Risk of personal injury
The vacuum and compressed air to the FlexFil-
ter EX must be turned off before commencing
filter change.
WARNING! Risk of personal injury
Use proper protective equipment.
WARNING! Risk of personal injury
Use proper lifting equipment.
It is recommended that the control filter is re-
placed when changing the main filter.
1 Access the filter with a lift or by using the service
platform (see Figure 26/A).
2 Disconnect piping and cleaning valve from the top
module.
3 Separate the top module from the housing and
disconnect the filters earth connection cable from
the top module.
FlexFilter EX
4 Put the old filter package in a large plastic bag, or
wrap it in plastic foil (see
spreading.
5 Fit the new filter package and refit the top mod-
ule. Remember to reconnect the earth cable.
6 Check earth connection between filter and GND1
before reconnecting the pipes, hoses and cables.
7 Check earth connection between the top and
GND1 and Control filter.
Changing individual filter socks
Individual filter socks that have been damaged can be
replaced. Use a screwdriver to detach the plastic lock-
ing ring (see Figure
The coiled spring can be reused with the new con-
ductive filter sock, but the locking ring (see
B) must be replaced when securing the new sock.
Never re-use an old locking ring!

17.6 Control filter change

The control filter should normally be replaced after
6000 hours of operation. The control filter must also
be replaced if damaged or if there is a high-pressure
drop over the control filter.
Procedure
WARNING! Risk of personal injury
The vacuum and compressed air to the FlexFil-
ter EX must be turned off before commencing
filter change.
WARNING! Risk of personal injury
Use proper protective equipment.
Always check the main filter for damage when
replacing the control filter.
1 Access the filter with a lift or by using the service
platform.
2 Disconnect the top piping of the filter housing and
open-top cover.
3 Remove and put the old filter in a large plastic bag,
or wrap it in plastic foil. Avoid dust spreading.
4 Fit a new filter cartridge in place. Ensure that the
filter cartridge is centred and that the rubber seal
on the housing is intact.
5 Close the top cover and reconnect the pipes.
6 Check the earth connection between the control
filter and GND1.

17.7 TVFD valve operation

Regular checks, preferably at every bag change,
should be made to ensure that the TVFD feed out
functions properly. The properties of the collected
material, and other factors such as moisture, mater-
Figure 26/B). Avoid dust
27/A).
Figure
EN
27/
43