WEG CFW11W G2 Series User Manual page 28

NOTA!
WEG RSW cooling system can be used for cooling the CFW11W G2. For further information, refer
to the RSW user's manual.
The water used in the coolant must meet the specifications of
contain any organic sediments or active chemical agents. The coolant is composed of demineralized water,
corrosion inhibitor and ethylene glycol.
ATTENTION!
Do not use sea or tap water in the coolant.
The specifications of the inverter output current informed in chapter 8 are for coolant temperature from 10 to 45 °C
(50 °F to 113 °F), and the composition according to
Table 3.5: Coolant composition for temperature from 10 to 45 °C (50 °F to 113 °F)
For the inverter operation at temperatures below 10 °C (50 °F), the concentration of ethylene glycol in the coolant
must be increased. The increase of the percentage of ethylene glycol reduces the coolant specific heat and the
system heat exchange capacity. Therefore, if the inverter operates with more ethylene glycol than the specification
of Table 3.5 on page 3-11
the ethylene glycol concentration is normally increased in order to reduce the coolant freezing point, the coolant
temperature reduction can compensate the current derating.
percentage of the output current as a function of the ethylene glycol concentration and the coolant temperature.
Table 3.6: Maximum percentage of the output current as a function of the ethylene glycol concentration and the coolant temperature
ATTENTION!
In order to prevent corrosion, always add 1,5 % of the inhibitor CorteC VpCI-649 to the coolant.
Table 3.4: Water specification
Characteristic
pH
Hardness
Conductivity
Chlorine
Iron
Maximum particle size
Table 3.5 on page
Component
Demineralized water
Ethylene glycol
Inhibitor CorteC VpCI-649
and coolant temperature of 45 °C (113 °F), the output current must be derated. As
10 %
37 °C (99 °F)
100 %
39 °C (102 °F) 100 %
41 °C (106 °F) 100 %
43 °C (109 °F) 100 %
45 °C (113 °F) 100 %
47 °C (117 °F)
98 %
49 °C (120 °F)
96 %
51 °C (124 °F) 94 %
53 °C (128 °F) 92 %
55 °C (131 °F) 90 %
Installation and Connection
Table 3.4 on page
Unit Value
6 - 8
°dH < 10
µS/cm < 10
mg/l < 10
mg/l < 0.1
µm < 300
3-11.
Proportion
88,5 %
10 %
1,5 %
Table 3.6 on page 3-11
Glycol Concentration
20 % 30 % 40 % 50 %
100 % 100 % 100 % 100 %
100 % 100 % 100 % 98 %
100 % 100 % 98 % 96 %
100 % 98 % 96 % 94 %
98 % 96 % 94 % 92 %
96 % 94 % 92 % 90 %
94 % 92 % 90 % 88 %
92 % 90 % 88 % 86 %
90 % 88 % 86 % 84 %
88 % 86 % 84 % 82 %
3-11. The coolant must not
shows the maximum
CFW-11W G2 | 3-11
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