Nederman FlexPAK DX Serie Manuel De L'utilisateur page 20

1 Preface
EN
Thank you for using a Nederman product!
The Nederman Group is a world-leading supplier and
developer of products and solutions for the environ-
mental technology sector. Our innovative products
will filter, clean and recycle in the most demanding of
environments. Nederman's products and solutions will
help you improve your productivity, reduce costs and
also reduce the impact on the environment from in-
dustrial processes.
Read all product documentation and the product iden-
tification plate carefully before installation, use, and
service of this product. Replace documentation im-
mediately if lost or damaged. Nederman reserves the
right, without previous notice, to modify and improve
its products including documentation.
This product is designed to meet the requirements
of relevant EC directives. To maintain this status, all
installation, maintenance, and repair is to be done
by qualified personnel using only Nederman original
spare parts and accessories. Contact the nearest au-
thorized distributor or Nederman for advice on tech-
nical service and obtaining spare parts. If there are
any damaged or missing parts when the product is de-
livered, notify the carrier and the local Nederman rep-
resentative immediately.
This manual is supplemented by:
• Installation and Service Manual
• PLC Settings Manual
• Electrical wiring diagrams
• Manuals for auxiliary equipment, e.g. feed out
devices
2 Safety
2.1 Classification of important informa-
tion
This document contains important information that
is presented either as a warning, caution or note, ac-
cording to the following examples:
WARNING! Risk of personal injury
Warnings indicate a potential hazard to the
health and safety of personnel, and how that
hazard may be avoided.
CAUTION! Risk of equipment damage
Cautions indicate a potential hazard to the
product but not to personnel, and how that
hazard may be avoided.
Notes contain other information that is import-
ant for personnel.
1 Source: ATEX 2014/34/EU Guidelines § 243 Filter units and vented silo bins.
20
FlexPAK DX
3 Description
3.1 Function
FlexPAK DX is a complete vacuum unit with a dir-
ect driven side channel fan fitted as one unit on a
steel frame and a start and control unit with an integ-
rated 24 V transformer. The unit is controlled by a fre-
quency converter, has automatic start/stop, and auto-
matic filter cleaning.
3.1.1 Filtration in two stages
FlexPAK DX filters particles in two stages. In the first
stage, coarse particles are separated away in the inlet.
In the second stage, fine particles are separated away
by filter bags, see Figure 9.
3.1.2 Automatic filter cleaning
FlexPAK DX uses filter cleaning by a short blast of re-
versed airflow with atmospheric pressure. By the rap-
id opening of the Filter Cleaning Valve (FCV) located
on top of the filter, a powerful blast of reversed air-
flow is created, efficiently dislodging dust from the fil-
ter bags, see Figure 8.
3.1.3 Control filter
The unit is equipped with a control filter, see
ure 4B, item 16. The control filter filters the air after
the main filter to ensure that no material continues
to the suction source in case of a main filter break-
age. The control filter functions as a safety device and
does not increase the filtration efficiency.
The pressure drop over the control filter is monitored,
and a signal is sent to the control unit if the pressure
difference reaches the set value. The pressure differ-
ence is preset at 4 kPa /40 mbar / 0.58 psi.
3.2 FlexPAK DX and ATEX
3.2.1 Area classification
FlexPAK DX is designed to extract combustible and
non-combustible dust, but the unit "as a whole" is not
to be placed in an area that is classified as a zone ac-
cording to directive 1999/92/EC. It is only the inside of
the filter that meets ATEX requirements.
FlexPAK DX may be used with duct systems internally
classified as zone 20, 21 or 22.
The product has no
ternal ignition source. The inside is to be considered a
simple filter/silo and does not fall under the scope of
the directive 2014/34/EU.
Fig-
marking since there is no in-
1