WEG CFW-11W G2 RB Series, Руководство пользователя

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Installation and Connection
CFW-11W G2 | 3-11
3
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 Table 3.4 on page 3-11 . The coolant must not
contain any organic sediments or active chemical agents. The coolant is composed of demineralized water,
corrosion inhibitor and ethylene glycol.
Table 3.4: Water specification
Characteristic Unit Value
pH 6 - 8
Hardness °dH < 10
Conductivity µS/cm < 10
Chlorine mg/l < 10
Iron mg/l < 0.1
Maximum particle size µm < 300
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 on page 3-11 .
Table 3.5: Coolant composition for temperature from 10 to 45 °C (50 °F to 113 °F)
Component Proportion
Demineralized water 88,5 %
Ethylene glycol 10 %
Inhibitor CorteC VpCI-649 1,5 %
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 and coolant temperature of 45 °C (113 °F), the output current must be derated. As
the ethylene glycol concentration is normally increased in order to reduce the coolant freezing point, the coolant
temperature reduction can compensate the current derating.
Table 3.6 on page 3-11 shows the maximum
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
Glycol Concentration
10 % 20 % 30 % 40 % 50 %
C
o
o
lan
t T
emp
er
atu
re
37 °C (99 °F) 100 % 100 % 100 % 100 % 100 %
39 °C (102 °F) 100 % 100 % 100 % 100 % 98 %
41 °C (106 °F) 100 % 100 % 100 % 98 % 96 %
43 °C (109 °F) 100 % 100 % 98 % 96 % 94 %
45 °C (113 °F)
100 % 98 % 96 % 94 % 92 %
47 °C (117 °F)
98 % 96 % 94 % 92 % 90 %
49 °C (120 °F)
96 % 94 % 92 % 90 % 88 %
51 °C (124 °F)
94 % 92 % 90 % 88 % 86 %
53 °C (128 °F) 92 % 90 % 88 % 86 % 84 %
55 °C (131 °F) 90 % 88 % 86 % 84 % 82 %
ATTENTION!
In order to prevent corrosion, always add 1,5 % of the inhibitor CorteC VpCI-649 to the coolant.