B.1.5 Braking Resistor - Siemens SINAMICS V20 Operating Instructions Manual

Options and spare parts
B.1 Options
B.1.5 Braking resistor
Operation conditions
Make sure that the resistor to be fitted to the SINAMICS V20 is adequately rated to handle
the required level of power dissipation.
All applicable installation, usage and safety regulations regarding high voltage installations
must be complied with.
If the inverter is already in use, disconnect the prime power and wait at least five minutes
for the capacitors to discharge before commencing installation.
This equipment must be earthed.
Extreme heat
Braking resistors get hot during operation. Do not touch the braking resistor during
operation.
Using an incorrect braking resistor can cause severe damage to the associated inverter
and may result in fire.
A thermal cut-out circuit (see diagram below) must be incorporated to protect the
equipment from overheating.
NOTICE
Minimum resistance values
A braking resistor with a resistance lower than the following minimum resistance values can
damage the attached inverter or braking module:
• 400 V inverter frame sizes A to C: 56 Ω
• 400 V inverter frame size D/E: 27 Ω
• 230 V inverter frame sizes A to C: 39 Ω
Functionality
An external braking resistor can be used to "dump" the regenerative energy produced by the
motor, thus giving greatly improved braking and deceleration capabilities.
A braking resistor which is required for dynamic braking can be used with all frame sizes of
inverters. Frame size D is designed with an internal braking chopper, allowing you to connect
the braking resistor directly to the inverter; however, for frame sizes A to C, an additional
dynamic braking module is required for connecting the braking resistor to the inverter.
316
WARNING
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884