Rf Top; Safety; Function; Maintenance - Nederman Flexfilter Manual De Instrucciones

8.1

RF Top

See Figure 1, items 1B and 1C.
8.1.1

Safety

RF top modules are fitted with compressed air cylinders that can cause severe personal
injury. The compressed air supply must be shut off before service work is carried out.
Pressing the Manual Function button a few times will release any residual pressure. Ensure
the vacuum unit can not start by switching off the maintenance switch and/or the main
switch on the starter.
8.1.2

Function

Figures 18–19 show schematically the function of a FlexFilter Twin RF. During normal
operation, Figure 18, the function is the same as for a basic dust collector.
When filters are cleaned, Figure 19, the valve (a) closes the outlet from the dust collector
and valve (b) opens to atmosphere. Air is sucked with considerable power through valve (b)
and flows in a reverse direction downwards through the filter socks. The dust is dislodged
and falls into the bin. The air then flows into the other side of the dust collector, upwards
through the filter socks into the top module. From here it continues to the vacuum unit. The
AFC-RF control unit ensures that next cleaning cycle cleans the other half of the filter socks.
Single RF works in the same way but here the top module is divided into two chambers, so
that half the filter socks are cleaned in one cycle and the other half in next cycle.
Figure 19 indicates an additional valve (c) at the piping system connection to the dust
collector. It can be installed in particularly difficult cases. This valve, if installed, is normally
open but closes during filter cleaning. Now, for a short moment, the full capacity of the
vacuum unit is available for filter cleaning. No air comes through the pipe work. The AFC-RF
manual gives instructions for connecting this optional valve.
Figures 20–21 show pneumatic schematics for Single RF and Twin RF.
8.1.3

Maintenance

The RF top needs no special maintenance. Before emptying the dust collecting bin, manual
filter cleaning should be carried out a couple of times. The vacuum unit should be running.
A distinct change in sound reveals the function. The same procedure should be followed at
approximately monthly intervals for dust collectors with automatic emptying.
8.2

Stands and wall brackets

See Figure 1. Large dust collecting bins and automatic emptying devices require stands (4
C–F) instead of legs. In some cases wall brackets (4G) are preferred to legs or stands.
8.2.1 Safety
The stand should be securely anchored to the foundation. The foundation should be level
and firm. A concrete foundation and expanding bolts are recommended, particularly if the
dust collector has been fitted with an explosion relief panel. Should a dust explosion occur,
strong side forces may be generated. The stand is not a work platform and is not fitted with
steps or a rail.
Wall brackets are supplied in pairs, a left-hand and a right-hand bracket. A FlexFilter Single
requires one pair and a Twin requires two. The wall brackets should be anchored to a wall
or pillar that is sufficiently solid, with adequate bolts. A Single dust collector can weigh
500 kg (1100 lbs) when the bin is full. In extreme cases the weight may be even higher if
the material is heavy and emptying has been neglected. The automatic feeding out device
(see Figure 1, item 7H) weighs 86 kg (189 lbs). A separate wall bracket is available for this
unit and must be installed when the dust collector is wall mounted.
FlexFilter EN
17