Connecting The Motor To The Soft Starter - Siemens SIKOSTART 3RW34 Instructions De Service

Operating Principle

4.1.3 Connecting the Motor to the Soft Starter

Wye Motor. The soft starter can be used for either a three-lead or six-lead wye motor. Connecting the soft starter
to a wye motor inserts the SCRs directly in the line wiring, referred to as "In Line" wiring.
Delta Motor. The soft starter can be used for either 6 or 12 lead delta motors. If the motor is hard wired as delta,
the starter must be connected and sized with "In Line" wiring as shown in Fig. 7a.
Fig. 7b shows the soft starter connected with the SCRs inside the delta, referred to as "Inside Delta" wiring. For
Inside Delta wiring, the soft starter power rating may be increased (line current = 1.73 phase current) relative to the
In Line power rating.
The type of connection, "In Line" or "Inside Delta" must be set using the DIP switch SW1.3 (see Section 7.1) on the
control board.
T3
3 or 6 Lead Wye Motors and 3 Lead
Delta Motors
Fig. 7 : Motor Connections
L1
L2
L3
N
PE
Rated Current I
Rated Current I
3 Leads to the Motor
Fig. 8 : In Line Connection; Inside Delta Connection
6
From Source Power
L1 L2 L3
T1 T2 T3
T1 T1
T3
T2
T2
Fig. 7a
In Line Connection
NSB00424
Equals Motor
e
n
Fig. 8a
From Source Power
L1 L2 L3
T1 T2 T3
T6
T3
T5
6 or 12 Lead Delta Motors
Fig. 7b
Inside Delta Connection
L1
L2
L3
N
PE
U2
U1
T1
L1
W2 W1
Rated Current I Equals Approx. 58 % of
e
Motor Rated Current I
6 Leads to the Motor
(Like for Wye-Delta Starters)
Fig. 8b
T6 T4 T5
T1
Note
order of:
T6 from L1
T4
T4 from L2
T5 from L3
T2
NSB00425
L2
T2
V1
V2
T3 L3
n
3ZX1012-0RW34-1AN1