Braking Resistor - Siemens SINAMICS G120 Installation Manual

8.8

Braking resistor

The braking resistor enables loads with a large moment of inertia to be braked quickly.
During braking of the motor and the load, excess energy is fed back to the converter. This
causes the voltage to rise in the DC link. The converter transfers the excess energy to the
externally mounted braking resistor.
Fire caused by an unsuitable or incorrectly installed braking resistor
Using an unsuitable or improperly installed braking resistor can cause fires and smoke to
develop. Fire and smoke development can cause severe personal injury or material
damage.
• Only use braking resistors that are approved for the converter.
• Install the braking resistor in accordance with regulations.
• Monitor the temperature of the braking resistor.
Mounting position
Mounting instructions
Mount the resistor on a heat resistant surface with a high thermal conductivity.
Do not cover the ventilation openings of the braking resistor.
You can mount the braking resistor either outside or inside the switchgear room. When
mounted outside, the cooling air requirement for the switchgear room is lower.
Power Module PM240-2
Hardware Installation Manual, 01/2020, A5E33294624B AL
WARNING
Accessories
8.8 Braking resistor
133