Siemens SINAMICS Series Operating Instructions Manual page 78

Technical data
4.6 Derating
Voltage derating depending on the installation altitude
The series of SINAMICS DCM units fulfill overvoltage category III according to EN 61800-5-1
for line supply circuits with respect to the environment (other line supply circuits, housing,
electronics).
For electronics and field supplies with voltages of 2-ph. 480 V AC (line-to-line; maximum
300 V AC to ground), operation is permitted up to 4500 m above sea level. A maximum of
2-ph. 400 V AC (line-to-line; maximum 230 V AC to ground) is permitted up to 5000 m.
All units, with 400 V up to 575 V as well as also with 690 V to 950 V rated armature supply
voltage, can be operated up to a maximum of 4000 m above sea level without voltage
derating.
For units with rated armature supply voltages of 690 V to 950 V, up to 4500 m a maximum
930 V AC and up to 5000 m, a maximum 880 V AC is permissible as armature supply
voltage.
For units with rated armature supply voltages of 400 V to 575 V, up to 4500 m a maximum
550 V AC and up to 5000 m, a maximum 500 V AC is permissible as armature supply
voltage.
If the specified voltages with respect to ground are exceeded or the installation altitude is
exceeded, then a reduction of the overvoltage category to II must be applied. As a
consequence, operation up to 6000 m without derating is permissible.
The overvoltage category of the line supply can be reduced to II using an appropriate surge
arrester, filter or isolation transformer. If this is not realized, then there is no longer safe
electrical separation of the electronics (interface connections on the CUD) with respect to the
line supply.
According to EN 61800-5-1, operation of units without "safe electrical separation" is
permissible only if it can be absolutely excluded that persons are in danger by being able to
directly touch or indirectly touch parts, i.e. in operation, none of the CUD interfaces can be
touched. A digital connection can be realized using an optical isolation.
76
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A