WEG CFW-11W, Addendum

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Technical Specifications
CFW11W | 5-3
Table 5.2: Specifications of the cooling system
Temperature of the air surrounding the inverter
0 °C to 40 °C (32 °F to 104°F) for nominal conditions. 40 °C to 45 °C (104 °F
to 113°F) with output current derating of 2 % for each 1 °C (1.8 °F) above 40
°C (104°F).
Humidity 5 % to 90 % non-condensing *.
Altitude
Maximum altitude: up to 1000 m (3,300 ft) - normal conditions.
1000 m to 4000 m (3,300 ft to 13,200 ft) - current derating of 1 % for each
100 m (or 0.3 % each 100 ft) above 1000 m (3,300 ft) of altitude.
2000 m to 4000 m (6,600 ft to 13,200 ft) - maximum voltage derating of 1.1
% for each 100 m (or 0.33 % each 100 ft) above 1000 m (3,300 ft) of altitude.
Pollution degree 2 (according to EN50178 and UL508C), with non-conductive pollution.
Coolant input temperature
0 °C to 40 °C (32 °F to 104°F) according to the coolant used. De 40 °C a 45
°C (104 °F to 113°F) with output current derating of 3 % for each 1 °C (1.8 °F)
above 40 °C (104°F).
Coolant output temperature 9 °C (16.2 °F) above the input temperature (nominal conditions).
Coolant used
5 °C to 40 °C (41 °F to 104 °F): filtered water + corrosion inhibitor (according
to recommendation of the manufacturer).
0 °C to 5 °C (32 °F to 41°F): 80 % fi 20 % ethylene corrosion
inhibitor (according to recommendation of the manufacturer).
Coolant flow
20 l/min (1.2 m3/hour).
Pressure drop on the UP11 module @ 20 l/min 3.3 bar (330 kPa).
Maximum system pressure in relation to the atmosphere 6 bar (600 kPa).
Recommended system pressure in relation to the
atmosphere
0.8 to 4.5 bar (80 to 450 kPa).
Water volume used in the UP11 module
0.4 l (0.4 dm3).
Coolant input and output connections
Coolant input: Quick connecting SMC KKA4S-04M, thread R
1/2 Coolant output: Quick connecting SMC KKA4P-04M,
thread R 1/2
*For further information, refer to item 2.4.1.
ATTENTION
!
The cooling system of the UP11 modules cannot be connected in series.