Siemens SINAMICS V20 Operating Instructions Manual page 137

Safety awareness
The coupled SINAMICS V20 converters must both be of equal power and supply voltage
rating.
The coupled converters must be connected to the mains supply through a single contactor
and fuse arrangement rated for a single converter of the type in use.
A maximum of two SINAMICS V20 converters can be linked using the DC coupling
methodology.
NOTICE
Integrated braking module
The integrated braking module within the frame size D and E converters is only active if the
converter receives an ON command and is actually running. When the converter 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 meters.
● For the converters of frame sizes AA 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 converter
must be used to connect the dynamic braking module wires to DC+ and DC- since the
converter 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 converters of frame size D and E for three phase, the dynamic braking circuit is
self-contained and only one external braking resistor has to be attached to one of the
converters. Refer to Appendix "Braking resistor (Page 370)" 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 converters is not certified for use in
UL/cUL applications.
No claims are made regarding the EMC performance of this configuration.
SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012
CAUTION
Commissioning via the built-in BOP
5.6 Function commissioning
135