Start And Control Unit; Function Description; Inlet; Fan - Nederman L-PAK Serie Manual De Instrucciones

4.5

Start and control unit.

The start and control unit consists of the following main components, figure 2.
1. Transformer (TR1). The transformer has in-built overcurrent protection on
the secondary side.
2. Transformer primary fuses F2 & F3.
3. Overcurrent relay (motor protection) with manual reset button (S1F).
4. Contactor L-PAK 150/Gradual start unit L-PAK 250.
5. PLC.
6. Terminals for 3-phase supply and grounding cables.
7. Terminals 31 & 32 for 24 V DC accessory supply. Fuse F5.
8. Terminals 13 & 14 for pilot signal cable (PS). Fuse F4. Strap 13-14 if pilot
signal cable is not used.
9. Other terminals required by some accessories, all 24 V DC. See
connection diagram.
There is a white warning lamp that lights whenever a fault occurs. This is a
common alarm. The following faults will cause the lamp to flash rapidly:
• The motor overload relay has tripped.
• The fan thermal switch has tripped.
• No compressed air supply. (The optional Compressed Air Switch, CAS,
must be installed.)
NOTE! When the lamp flashes slowly it is an indication that a service is due,
see 8.5. Running meter.
The unit is equipped with a potential free contact for the common alarm,
which can also be relayed to an external alarm.
4.6

Function description

The functions are described with the help of figure 3.
4.6.1

Inlet

The dust collector is designed to keep the air speed in the lower part of the
collector as low as possible. Coarse dust falls directly into the collector bin.
Fine dust follows the air flow upwards and deposits on the outer surfaces of
the filter with surface filtration. The filter has a smooth surface on the outside
with fine pores, so that dust is separated directly onto the surface without
penetrating into the filter material. This makes the filter easy to clean, gives
a high degree of separation and permits intense use, i.e. a large flow of air in
relation to the surface area.
The clean air leaves the collector through the top and passes via the micro-
filter housing into the side channel fan with integrated motor.
The unit can be equipped with a micro-filter, figure 13 as an accessory.
4.6.2

Fan

The fan has a pump characteristic, i.e. the higher the vacuum it creates the
more power it draws from the motor.
L-PAK 150, L-PAK 250 EN
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