Siemens 3RW44 - Page 108

Commissioning
6.5 Other device functions
3RW44 soft starters
108 Manual, 03/2017, NEB535219502000/RS-AB/008
Note
When using the 3RW44 soft starter in an IT system with ground fault monitoring: 3RW44,
product version < *E06* and the PROFIBUS DP communication module must not be used in
this network configuration. 3RW44 soft starters from
product version *E07* onwards can be
used in combination with the PROFIBUS DP communication module. However, the phase
voltage values (UL
-N) and phase-to-phase voltage values (UL-L) may be displayed
incorrectly on the measured value display of the 3RW44.
Note
PROFINET communication modules can only be used with a product version of *E12* or
later.
Note
The "Phase currents" display always shows the currents in the supply cable. This means
that, if the soft starter is operated in the "Inside
-delta circuit" circuit type, the currents
measured internally by the soft starter are extrapolated to the supply cable current (phase
current) by a factor of 1.73 and are displayed.
Due to unbalance, the phase currents displayed in the inside
-delta circuit may deviate from
the currents that are actually running through the supply cables.