SIEMENS
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Siemens D 21.4 · 2017
SINAMICS S120 drive system
Chassis format
Liquid-cooled units in chassis format
7
■
Technical specifications
(continued)
Protection against condensation
With liquid-cooled units, warm air can condense on the cold
surfaces of heat sinks, pipes and hoses. This condensation
depends on the air humidity and the temperature difference
between the ambient air and the coolant.
The water which is produced as a result of condensation can
cause corrosion as well as electrical damage such as creepage
shorts and flashovers. As the SINAMICS units cannot prevent
condensation if it is caused by the prevailing climatic conditions,
any potential risk of condensation must be prevented by appro-
priate engineering or by precautionary measures implemented
by the customer. These measures include the following:
•
a fixed coolant temperature that has been adjusted to the
expected air humidity or ambient temperature ensures that
critical differences between the coolant and ambient air
temperatures do not develop or
•
temperature regulation of the coolant as a function of the
ambient air temperature
The temperature at which water vapor contained in the air con-
denses into water is known as the dew point. To prevent conden-
sation reliably, the coolant temperature must always be higher
than the dew point.
The table below specifies the dew point as a function of room
temperature T and relative air humidity
Φ
for an atmospheric
pressure of 100 kPa (1 bar). This corresponds to an installation
altitude of 0 up to approximately 500 m (1640 ft) above sea level.
Since the dew point drops as the air pressure decreases, the
dew point values at higher installation altitudes are lower than
the specified table values. It is therefore the safest approach to
engineer the coolant temperature according to the values in the
table for an installation altitude of zero.
A detailed description of the cooling circuits and the recom-
mended coolant is given in the SINAMICS Low Voltage Engi-
neering Manual.
■
Characteristic curves
Pressure drop
Pressure drop for liquid-cooled built-in units in chassis format
The pressure drop characteristics are valid for water. If anti-
freeze is used, the characteristics typically shift to the left.
For further information, please refer to the SINAMICS Low
Voltage Engineering Manual.
Ambient temperature
Relative air humidity
Φ
T
20 %
30 %
40 %
50 %
60 %
70 %
80 %
85 %
90 %
95 %
100 %
10 °C (50 °F)
<0 °C
(32 °F)
<0 °C
(32 °F)
<0 °C
(32 °F)
0.2 °C
(32.4 °F)
2.7 °C
(36.9 °F)
4.8 °C
(40.6 °F)
6.7 °C
(44.1 °F)
7.6 °C
(45.7 °F)
8.4 °C
(47.1 °F)
9.2 °C
(48.6 °F)
10 °C
(50 °F)
20 °C (68 °F)
<0 °C
(32 °F)
2 °C
(35.6 °F)
6 °C
(42.8 °F)
9.3 °C
(48.7 °F)
12 °C
(53.6 °F)
14.3 °C
(57.7 °F)
16.4 °C
(61.5 °F)
17.4 °C
(63.3 °F)
18.3 °C
(64.9 °F)
19.1 °C
(66.4 °F)
20 °C
(68 °F)
25 °C (77 °F)
0.6 °C
(33.1 °F)
6.3 °C
(43.3 °F)
10.5 °C
(50.9 °F)
13.8 °C
(56.8 °F)
16.7 °C
(62.1 °F)
19.1 °C
(66.4 °F)
21.2 °C
(70.2 °F)
22.2 °C
(72 °F)
23.2 °C
(73.8 °F)
24.1 °C
(75.4 °F)
24.9 °C
(76.8 °F)
30 °C (86 °F)
4.7 °C
(40.5 °F)
10.5 °C
(50.9 °F)
14.9 °C
(58.8 °F)
18.4 °C
(65.1 °F)
21.3 °C
(70.3 °F)
23.8 °C
(74.8 °F)
26.1 °C
(79 °F)
27.1 °C
(80.8 °F)
28.1 °C
(82.6 °F)
29 °C
(84.2 °F)
29.9 °C
(85.8 °F)
35 °C (95 °F)
8.7 °C
(47.7 °F)
14.8 °C
(58.6 °F)
19.3 °C
(66.7 °F)
22.9 °C
(73.2 °F)
26 °C
(78.8 °F)
28.6 °C
(83.5 °F)
30.9 °C
(87.6 °F)
32 °C
(89.6 °F)
33 °C
(91.4 °F)
34 °C
(93.2 °F)
34.9 °C
(94.8 °F)
40 °C (104 °F)
12.8 °C
(55 °F)
19.1 °C
(66.4 °F)
23.7 °C
(74.7 °F)
27.5 °C
(81.5 °F)
30.6 °C
(87.1 °F)
33.4 °C
(92.1 °F)
35.8 °C
(96.4 °F)
36.9 °C
(98.4 °F)
37.9 °C
(100.2 °F)
38.9 °C
(102 °F)
39.9 °C
(103.8 °F)
45 °C (113 °F)
16.8 °C
(62.2 °F)
23.3 °C
(73.9 °F)
28.2 °C
(82.8 °F)
32 °C
(89.6 °F)
35.3 °C
(95.5 °F)
38.1 °C
(101.6 °F)
40.6 °C
(105.1 °F)
41.8 °C
(107.2 °F)
42.9 °C
(109.2 °F)
43.9 °C
(111 °F)
44.9 °C
(112.8 °F)
50 °C (122 °F)
20.8 °C
(69.4 °F)
27.5 °C
(81.5 °F)
32.6 °C
(90.7 °F)
36.6 °C
(97.9 °F)
40 °C
(104 °F)
42.9 °C
(109.2 °F)
45.5 °C
(113.9 °F)
46.6 °C
(115.9 °F)
47.8 °C
(118 °F)
48.9 °C
(120 °F)
49.9 °C
(121.8 °F)
0
0
70
100
200
300
400
10
20
30
40
50
60
70
80
G_D211_EN_00316
Volumetric flow d
v
/d
t
[liters/min]
maximum differential
pressure
nominal differential
pressure
Power Module
frame size FL
Basic Line Module
frame size FBL
Motor Module
frame size FXL
Pressure drop [k
P
a]
Power Module
frame size GL
Basic Line Module
frame size GBL
Active Line Module
frame size GXL
Motor Module
frame size GXL
Active Interface Module
frame size JIL
Active Line Module,
Motor Module
frame size HXL
Active Line Module,
Motor Module
frame size JXL
© Siemens AG 2017