Siemens SINAMICS V20 Operating Instructions Manual page 131

Connection for DC coupling
The following figure illustrates the system connection using DC coupling.
See Section "Terminal description (Page 38)" for the recommended cable cross-sections
and screw tightening torques.
See the SINAMICS V20 Inverter Compact Operating Instructions for the recommended fuse
types.
Destruction of inverter
It is extremely important to ensure that the polarity of the DC link connections between the
inverters is correct. If the polarity of the DC terminals' connections is reversed, it could
result in the destruction of the inverter.
Safety awareness
The coupled SINAMICS V20 inverters must both be of equal power and supply voltage
rating.
The coupled inverters must be connected to the mains supply through a single contactor
and fuse arrangement rated for a single inverter of the type in use.
A maximum of two SINAMICS V20 inverters can be linked using the DC coupling
methodology.
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
WARNING
CAUTION
Commissioning via the built-in BOP
5.6 Function commissioning
131