3RW44 soft starters
20
Manual, 03/2017, NEB535219502000/RS-AB/008
Configuration instructions
3
3.1
Configuration
The 3RW44 electronic soft starters are designed for normal starting. In case of heavy
starting or increased starting frequency, a larger unit may have to be selected.
For long starting times it is recommended to have a PTC sensor in the motor. This also
applies to soft stop, pump stop and DC braking coasting methods because, during the coast-
down time in these modes, an additional current loading applies in contrast to coasting
down.
The motor feeder between the soft starter and motor must not contain any capacitive
elements (such as compensation systems). Active filters must not be operated in
combination with soft starters.
All elements of the main circuit (such as fuses and switching devices) should be
dimensioned for direct-on-line starting, following the local short-circuit conditions, and must
be ordered separately.
The harmonic component load for starting currents must be taken into consideration for the
selection of motor starter protectors (selection of trip unit).
3.1.1
RS 232 serial PC interface and Soft Starter ES parameterizing and operating
software
The electronic 3RW44 soft starters have a PC interface for communicating with the Soft
Starter ES smart software and an operating and monitoring module (display).
3.1.2
Simulation Tool for Soft Starters (STS)
With this software, you can simulate and select all Siemens soft starters, taking into account
various parameters such as line conditions, motor and load data, and special application
requirements, etc.
The Simulation Tool for Soft Starters (STS) can be downloaded from the Internet
https://support.industry.siemens.com/cs/ww/en/view/101494917