Siemens SINAMICS V20 Operating Instructions Manual page 376

Options and spare parts
B.1 Options
Connection
The mains supply to the converter can be provided through a contactor which disconnects
the supply if the resistor overheats. Protection is provided by a thermal cut-out switch
(supplied with each resistor). The cut-out switch can be wired in-series with the coil supply
for the main contactor (see diagram below). The thermal switch contacts close again when
the resistor temperature falls; after which the converter starts automatically (P1210 = 1). A
fault message is generated with this parameter setting.
Commissioning
The braking resistors are designed to operate on a 5% duty cycle. For converter frame size
D and E, set P1237 = 1 to enable the braking resistor function. For other frame sizes, use
the dynamic braking module to select the 5% duty cycle.
Note
Additional PE terminal
Some resistors have an additional PE connection available on the resistor housing.
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SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012