Atlas Copco GA50 (W) VSD, Инструкция

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2920 1190 05
20
Industrial Air Division Instruction book
Ref. Description/recommendation
L = pipe length in m
∆
P = maximum allowable pressure drop
(recommended 0.1 bar (1.45 psi))
d = inner diameter of pipe in mm
P = compressor outlet pressure in bar absolute
Qc = free air delivery of compressor in l/s
4 Ventilation: the inlet grids and ventilation fan should be
installed in such a way that any recirculation of cooling
air to the compressor is avoided. The air velocity to the
grids must be limited to 5 m/s. The maximum allowable
pressure drop over the cooling air ducts (air-cooled
compressors) depends on the ambient temperature,
consult Atlas Copco. The maximum air temperature at
the compressor intake opening is 40°C (104°F)
(minimum 0°C (32°F)).
The required ventilation to limit the compressor room
temperature can be calculated as follows:
For alternatives 1 and 3: Qv = 0.92 N/
∆
T
Qv = required ventilation capacity in m
3
/s
For air-cooled compressors: N = shaft input of
compressor in kW
For water-cooled compressors: N = 10 kW
∆
T = temperature increase in compressor room
5 The drain pipes to the drain collector must not dip into
the water. For draining of pure condensate water, install
an oil/water separator. Consult Atlas Copco.
6 Control module with monitoring panel.
7 Mains cables entry.
8 High-efficiency filter, type PD (optional). Filter traps
solid particles down to 0.01 micron with max. oil carry-
over of 0.01 mg/m
3
. A PD filter must be installed
downstream of a DD filter (optional).
If oil vapour and odours are undesirable, a filter of the
QD type (optional) should be installed downstream of
the PD filter.
2.4 Electrical connections
General
1. Check the fuses and the setting of the circuit breaker(s).
See section 7.3
2. Connect the power supply to terminals (L1, L2 and L3).
Connect the earth conductor to connector (PE). Consult
section 2.2.
2.5 Cooling water requirements
Following requirements are given as a general rule to prevent
cooling water problems. If in any doubt, consult Atlas Copco.
Recommended maxima - mg/l Recirculating Open
system
system
Chloride (Cl
-
) . . . . . . . . . . . . . . . . < 600 < 150
Sulphate (SO
4
--
) . . . . . . . . . . . . . . < 400 < 250
Total solids . . . . . . . . . . . . . . . . . . < 3000 < 750
Suspended solids (as SiO
2
) . . . . . . < 10 < 10
Free chlorine (Cl
2
) . . . . . . . . . . . . < 4 < 2
Ammonia (NH
4
+
) . . . . . . . . . . . . . < 0.5 < 0.5
Copper . . . . . . . . . . . . . . . . . . . . . < 0.5 < 0.5
Iron . . . . . . . . . . . . . . . . . . . . . . . . < 0.2 < 0.2
Manganese . . . . . . . . . . . . . . . . . . < 0.1 < 0.1
Oxygen . . . . . . . . . . . . . . . . . . . . . < 3 < 3
Carbonate hardness (as CaCO
3
) . . 50-1000 50-500
Organics (KMnO
4
Consumption) . < 25 < 10
Remarks
-
No algae nor oil.
- Chloride and sulphate are interactive. In open systems the
sum of the squares of these values must not exceed 85,000.
For recirculating systems with proper controls and treatment,
the sum of the squares may be up to 520,000. Note that the
sulphate value must include any sulphite present.