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Siemens D 21.4 · 2017
SINAMICS S120 drive system
Chassis format
Air-cooled units in chassis format
7
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Characteristic curves
Derating data, chassis format
Air-cooled SINAMICS G120 chassis format units and the associ-
ated system components are rated for an ambient temperature
of 40 °C (104 °F) and installation altitudes up to 2000 m (6562 ft)
above sea level.
At ambient temperatures > 40 °C (104 °F), the output current
must be reduced. Ambient temperatures above 55 °C (131 °F)
are not permissible.
At installation altitudes > 2000 m (6562 ft) above sea level, it
must be taken into account that the air pressure, and therefore
air density, decreases as the height increases. As a conse-
quence, the cooling efficiency and the insulation capacity of the
air also decrease.
Due to the reduced cooling efficiency, it is necessary, on the one
hand, to reduce the ambient temperature and on the other hand,
to reduce the heat loss in the built-in unit by reducing the output
current, whereby ambient temperatures lower than 40 °C
(104 °F) may be offset to compensate.
The following table lists the permissible output currents depend-
ing on the installation altitude and ambient temperature. The
specified values already include a permitted compensation in
respect of installation altitude and ambient temperatures < 40 °C
(104 °F) (temperature at the air intake of the built-in unit).
The values apply under the precondition that a cooling air flow
through the devices is guaranteed as specified in the technical
specifications.
As additional measure for installation altitudes from 2000 m
(6562 ft) up to 5000 m (16405 ft), an isolating transformer is
required in order to reduce transient overvoltages according to
EN 60664-1.
For additional information, please refer to the SINAMICS Low
Voltage Configuration Manual.
Current-derating factors for SINAMICS S120 chassis units as a function of the ambient/air intake temperature and the
installation altitude
Current derating for Power Modules and Motor Modules in
chassis format as a function of the pulse frequency
To reduce motor noise or to increase output frequency, the pulse
frequency can be increased relative to the factory setting
(1.25 kHz or 2 kHz). When the pulse frequency is increased, the
derating factor of the output current must be taken into account.
This derating factor must be applied to the currents specified in
the technical specifications.
For additional information, please refer to the SINAMICS Low
Voltage Engineering Manual.
The following table lists the rated output currents of the
SINAMICS S120 Power Modules and Motor Modules with pulse
frequency set in the factory as well as the current derating
factors (permissible output currents referred to the rated output
current) for higher pulse frequencies.
Derating factor of the output current as a function of the pulse frequency for units with a rated pulse frequency of 2 kHz
Installation altitude above sea
level
Current derating factor
(as a percentage of the rated current)
for an ambient / air intake temperature of
m (ft)
20 °C (68° F)
25 °C (77° F)
30 °C (86° F)
35 °C (95° F)
40 °C (104 °F)
45 °C (113° F)
50 °C (122° F)
55 °C (131° F)
0 ... 2000 (0 ... 6562)
93.3 %
86.7 %
80.0 %
2001 ... 2500 (6565 ... 8202)
96.3 %
2501 ... 3000 (8205 ... 9843)
100 %
98.7 %
3001 ... 3500 (9846 ... 11483)
3501 ... 4000 (11486 ... 13124)
96.3 %
4001 ... 4500 (13127 ... 14764)
97.5 %
4501 ... 5000 (14767 ... 16405)
98.2 %
Power Module
Motor Module
Type rating
at 400 V
Output current
at 2 kHz
Derating factor
at pulse frequency
6SL3310-...
6SL3320-...
kW (hp)
A
2.5 kHz
4 kHz
5 kHz
7.5 kHz
8 kHz
380 ... 480 V 3 AC
1TE32-1AA3
110 (150)
210
95 %
82 %
74 %
54 %
50 %
1TE32-6AA3
132 (200)
260
95 %
83 %
74 %
54 %
50 %
1TE33-1AA3
160 (250)
310
97 %
88 %
78 %
54 %
50 %
1TE33-8AA3
200 (300)
380
96 %
87 %
77 %
54 %
50 %
1TE35-0AA3
250 (400)
490
94 %
78 %
71 %
53 %
50 %
© Siemens AG 2017