Siemens SINAMICS S120 Equipment Manual page 412

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8.27 L61/L62, L64/L65, braking units
Safety information
CAUTION
A cooling clearance of 200 m must be maintained on all sides of the component (with
ventilation grilles).
The braking-resistor cables must be laid in such a way that they are short-circuit and
ground-fault proof.
The surface temperature of the braking resistors may exceed 80 °C during operation.
Note
The connecting cables to the Braking Module in the Basic Line Module, Smart Line Module,
Active Line Module, or Motor Module must be kept as short as possible (maximum of
100 m).
The braking resistors are only suitable for floor mounting.
The maximum cable length between the cabinet unit and braking resistor is 100 m.
Sufficient space must be available for dissipating the energy converted by the braking
resistor.
A sufficient distance from flammable objects must be ensured.
The braking resistor must be installed as a free-standing unit.
Objects must not be placed on or anywhere above the braking resistor.
The braking resistor should not be installed underneath fire-detection systems, since these
could be triggered by the resulting heat.
For outdoor installation, a hood should be provided to protect the braking resistor against
precipitation (in accordance with degree of protection IP20).
Connecting the braking resistor
The Braking Module must only be connected when the Basic Line Module, Smart Line
Module, Active Line Module, or Motor Module has been disconnected from the power
supply and the DC link has been discharged.
Note
The braking-resistor cables must be laid in such a way that they are short-circuit and ground-
fault proof.
The length of the connecting cables between the Braking Module and external braking
resistor must not exceed 100 m.
412
WARNING
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A