Siemens SINAMICS V20 Operating Instructions Manual page 132

Commissioning via the built-in BOP
5.6 Function commissioning
NOTICE
Integrated braking chopper
The integrated braking chopper within the frame size D inverter is only active if the inverter
receives an ON command and is actually running. When the inverter is powered down, the
regenerative energy cannot be pulsed to the external braking resistor.
Limitations and restrictions
● The maximum length of the coupling cable is 3 metres.
● For the inverters of frame sizes A to C, if a dynamic braking module is to be used, an
additional connector with a current rating the same as the supply cable to one inverter
must be used to connect the dynamic braking module wires to DC+ and DC- since the
Inverter terminals may not support an additional connection.
● The cable rating to the dynamic braking module needs to be at least 9.5 A for a 5.5 kW
full power rating (as measured using a minimum resistor value of 56 Ω). Screened cable
should be used.
● For the inverters of frame size D for three phase, the dynamic braking circuit is self-
contained and only one external braking resistor has to be attached to one of the
inverters. Refer to Appendix "Braking resistor (Page 357)" for the selection of an
appropriate braking resistor.
● The compound braking must never be activated.
Note
Performance and potential energy savings
The performance and potential energy savings using the DC coupling function is highly
dependent on the specific application. Therefore, Siemens makes no claim regarding the
performance and energy saving potential of the DC coupling methodology.
Note
Standards and EMC disclaimers
The DC coupling configuration with the SINAMICS V20 inverters is not certified for use in UL
/ cUL applications.
No claims are made regarding the EMC performance of this configuration.
See also
Typical system connections (Page 35)
132
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006