Safety Instructions For Blocksize Braking Resistors - Siemens SINAMICS S120 Equipment Manual

DC link components
6.1 Blocksize
6.1.1.2

Safety instructions for blocksize braking resistors

Fire and device damage as a result of ground fault/short-circuit
The cables to the braking resistor must be routed so that a ground fault or short circuit can
be ruled out. A ground fault can result in fire with associated smoke.
• Comply with local installation regulations, which allow this fault to be ruled out.
• Protect the cables from mechanical damage.
• In addition, apply one of the following measures:
Burns or damage resulting from the high surface temperature of the braking resistor
The braking resistor can become very hot. You can be severely burnt when touching the
surface. Neighboring components can become damaged.
• Mount the braking resistor so that it cannot be touched. If this is not possible, at the
• To avoid temperature-related damage to adjacent components, follow these rules:
NOTICE
Damage to braking resistor due to ingress of water
If the heat generated by the brake resistor is not dissipated then this can result in damage.
• Do not cover the ventilation openings of the braking resistor.
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WARNING
– Use cables with double insulation.
– Observe adequate clearances, e.g. through the use of spacers.
– Route the cables in separate cable ducts or pipes.
CAUTION
dangerous locations, attach an appropriate warning note that is clearly visible and easy
to understand.
– Mount the resistor on a heat resistant surface with a high thermal conductivity.
For PM240-2 Power Modules FSA, FSB and FSC installed horizontally close to the
ground:
– Installation on sheet steel > 2 mm
– Ensure a ventilation clearance of 250 mm at the sides of the braking resistor
– Ventilation clearance of 1000 mm above the braking resistor
For PM240-2 Power Modules FSA, FSB and FSC when installed vertically against a wall
or panel:
– Installation on sheet steel > 2 mm
– Ensure a ventilation clearance of 100 mm at the sides of the braking resistor
– Ventilation clearance of 1000 mm above the braking resistor
For PM240-2 FSD, FSE, FSF and FSG Power Modules:
– Observe the data provided in the braking resistor documentation
Manual, 06/2019, 6SL3097-5AL00-0BP1
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