Siemens SINAMICS S120 Combi Equipment Manual page 67

DC-link discharge time
The danger note for the DC link discharge time must be placed on the component in the
national language.
A set of labels in 16 languages is provided with the component.
If the S120 Combi is not disconnected from the line supply system (e.g. via the line
contactor or main switch), the DC link remains charged.
CAUTION
DC link busbars
After the S120 Combi has been expanded with expansion axes and/or DC link components,
the correct tightening torque of the DC link busbar bolts must be checked (1.8 Nm,
tolerance +30 %). The check is made before commissioning when the overall plant or
system is in a no-voltage state with the DC link discharged. After transportation, the screws
must be tightened.
CAUTION
Operation on line supplies where energy recovery is not possible
In a line supply system without energy recovery capability (e.g. diesel generator), the
energy recovery capability of the S120 Combi must be deactivated using parameter p3533
(see description of functions). The braking energy must then be dissipated via an additional
Braking Module with braking resistor provided in the drive line-up.
In the interests of operator and fire protection, the line supply conditions in terms of short-
circuit power and loop impedance at the infeed point must be such that they will trip the
installed overcurrent protection devices within the prescribed period if a fault occurs (short
circuit or short circuit to exposed conductive part).
Note
System fault level at the infeed point
In order to limit the line harmonics to an appropriate level for additional loads, the system
fault level at the infeed point must be at least a factor 70 higher than the rated power of the
integrated infeed.
SINAMICS S120 Combi
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
DANGER
DANGER
DANGER
S120 Combi Power Modules
3.2 Safety information
67