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Instruction book
Ref. Description/recommendation
5 The drain pipes to the drain collector must not dip into
the water of the drain collector. Atlas Copco has oil/
water separators (type OSD) to separate the major part
of the oil from the condensate to ensure that the
condensate meets the requirements of the environmental
codes.
6 Position of the control panel.
7 Position of the mains cable.
8 Provision for the inlet and outlet of the optional energy
recovery system.
9 Filter, type DD, for general purpose filtration (optional).
The filter traps solid particles down to 1 micron with a
max. oil carry-over of 0.5 mg/m³. A high-efficiency
filter, type PD (optional), may be installed downstream
of a DD filter. This filter traps solid particles down to
0.01 micron with a max. oil carry-over of 0.01 mg/m³.
If oil vapour and odours are undesirable, a filter of the
QD type (optional) should be installed downstream of
the PD filter.
It is recommended to provide by-pass pipes and valves
over the filters to isolate the filters during maintenance
without disturbing the compressor.
10 The air receiver (optional) should be installed in a frost-
free room on a solid, level floor.
For normal air consumption, the volume of the air net
(receiver and piping) can be calculated as follows:
V = (0.25 x Qc x P1 x To) / (fmax x dP x T1)
V = volume of air net in l
Qc = free air delivery of compressor in l/s
P1 = compressor air inlet pressure in bar absolute
fmax = cycle frequency = 1 cycle/30 s
dP = Punload - Pload in bar
T1 = compressor air inlet temperature in K
To = air receiver temperature in K
11 Position of the by-pass system (optional) to by-pass the
dryer during service operations. Consult Atlas Copco.
12 Position of the water separator, which removes most of
the condensate in the compressed air when by-passing
the dryer.
2.3 Electrical connections
General
- Provide an isolating switch.
- Check that the motor cables and wires inside the electric
cabinet are clamped tight to their terminals.
- Check the fuses and the setting of the overload relay. See
section 7.
- Connect the power supply cables to terminals (L1, L2 and
L3-Figs. 1.10/1.15)
- Connect the earth conductor to earth bolt (PE-Figs. 1.10/
1.15) and the neutral conductor to connector (N).
- Later production compressors are provided with a phase
sequence relay (K25-Fig. 1.10/1.15). If it is an adjustable
version, check that Un is adjusted according to the voltage
supply and that T is adjusted to 3 seconds.
On Pack FF/Workplace FF (except for 440/460 V - 60 Hz)
(Fig. 1.11):
The voltage supply to the dryer must be 230 V single-phase.
The voltage to the dryer is supplied over the contacts of relay
(K11), which close when the compressor is started. For
compressor supply voltages different from 3 x 400 V plus
neutral, 3 x 200 V or 3 x 230V, the power to the dryer is supplied
by a transformer.
On Pack FF/Workplace FF (440/460 V - 60 Hz) (Fig. 1.11):
These compressors have a 3-phase dryer. The voltage to the
dryer is supplied over the contacts of relay (K11), which close
when the compressor is started.
2.4 Electric cable size
Attention
- Local regulations remain applicable if they are stricter than
the values proposed below.
- The voltage drop must not exceed 5 % of the nominal
voltage. It may be necessary to use cables with a larger
section than those stated to comply with this requirement.
- Max. cable length = 25 m, max. ambient temperature = 40
degrees celsius, cables in free air or in raceway, copper
conductors.
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