Semiconductor soft starter 3RW3 Stand-alone setup In a standalone setup, the vertical and lateral clearance between the installed units is not less than a certain minimum value. This applies regard- less of whether individual units or complete load feeders are involved. For a stand-alone setup, the following minimum clearances must be observed (the minimum clearances depend on the size): 3RW30 Tabelle 8-5: Stand-alone setup, lateral minimum clearances, 3RW3 Tabelle 8-6: Stand-alone setup, vertical minimum clearances, 3RW3 Cable lengths for cycling The control inputs for activation and deactivation are not designed for long distances. This means:
Coupling relays must be used for control that exceeds the scope of the control cabinet The control lines inside the control cabinet should not be laid together with power cables. When electronic output modules are used for control (e.g. triac outputs in the case of 230 V AC), in certain circumstances RC networks (e.g. 3TX7462- 3T or similar with C > 100 nF) are needed at the control inputs Compensation factors If clearances are less than the minimum, fixed compensation factors must be used when combining the soft starter wit a circuit-breaker to determine the unit's rated current and the switching frequency. The following quantities can be modified by compensation factors:
Unit's rated current Switching frequency Circuit-breaker's current setting Overload relay's current setting 8-18 Stand 08/99 Size Lateral minimum clear- ance S00 15 S0 20 S2 30 S3 40 a 3RW30 b Size Vertical clearance a Vertical clearance b S00 50 50 S0 60 40 S2 50 30 S3 60 30