Power Connection; Motor Connection; Grounding; Series-Connected Switching Unit - Siemens SIKOSTART 3RW34 Instructions De Service

Installation

5.4.1 Power Connection

Connect the proper capacity 3-phase 50/60 Hz voltage source to the soft starter input terminals L1, L2, and L3. These
terminals are not phase sensitive.
Only use flexible connectors to connect power wires to soft
starter busbar.

5.4.2 Motor Connection

Wrong motor connection can cause property damage.
Confirm that the motor connections are according to the wiring
diagrams in Section 6.
1.
2. The soft starter can be used for wye or delta motors with connections to the motor as either In Line wiring or
3. 3RW34 soft starters should not be operated without a connected load. Even if the ON command is not present,

5.4.3 Grounding

The soft starter case and motor frame must be properly grounded in accordance with pertinent installation
instructions. The SIKOSTART Soft Starter features a ground stud at the power and ground terminals for connection
to system ground in the unit enclosure.

5.4.4 Series-connected switching unit

Improper usage (e.g. overload) may cause one or several thyristors of the unit to change to low-resistance values.
Depending on the wiring, the motor cannot be switched off any more by the motor control unit. As a preventive
measure, a series-connected switching unit (e.g. contactor, circuit-breaker) may be inserted on the line side.
Triggering can be executed via the fault contact of the unit or via EMERGENCY STOP.
10
Hazardous voltage.
Can cause death, serious injury, and property
damage.
The soft starter case must be grounded to earth for
operator's safety.
CAUTION
CAUTION
The IEC (International Electrotechnical Commission) motor overload protection requirement can be met with an
overload relay.
Inside Delta wiring (Section 4.1.3). Be sure the power ratings are correct for the type of connection required for
the application; refer to Section 9.
The SIKOSTART is for both wye and delta motors. Where the winding ends are not accessible, the SIKOSTART
is connected directly to the power-in lead (In Line connection). Set In Line connected motors to SW1-3 "star" and
use the HP/kW ratings for In Line connected motors. With (6) or (12) lead Inside Delta connected motors operate
the SIKOSTART inside the delta. Set selector switch SW1-3 to "delta" and use the HP/kW rating for Inside Delta
connected motors.
the self-diagnosis function of the soft starter may output error messages if the load is disconnected when the
main and supply voltages are still connected. This will not, however, destroy the device.
WARNING
3ZX1012-0RW34-1AN1