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5:2.1.1 External Bypass contactor
An external by-pass contactor can be used for softstarter sizes PST30...300 (built in for
PSTB370...1050).
Connect the contactor to terminals B1, B2 and B3 on the line side and terminals 2T1, 4T2
and 6T3 on the motor side.
The terminal markings are printed on the front label.
Information!
Do not use terminals B1, B2 or B3 for the “Inside Delta” connection. The current
measurement will be wrong.
5:2.1.2 Protective earthing
Softstarters type PST85...PSTB1050 should be earthed using the terminals as shown in
Figure 5 (one connection is sufficient).
Warning!
Do not operate machine with the grounding wire disconnected
1
100-250V
Stop
Start
In0
In1
Vc
50/60 Hz
2 3
4 5
6
7
8
9
10
Vp
Vp
11
K4
12
13
14
Vn
15
16
K5
17
18
19
K6
20
B1
B2
B3
Figure 4: External bypass contactor
connection
Chapter 5
Connection
M8
M8
M10
M12
9 Nm - 80 lb.in
M8
6 Nm - 53 lb.in
1 x 6 ...... 70 mm
2 x 6 ...... 35 mm
1 x 6 ...... 70 mm
2 x 6 ...... 35 mm
!
WG 1...8
2
2
2
2
18 Nm - 160 lb.in
PST 30...72
PST 85...142
PST 175...300
14
14
1L1
2T1
4T2
6T3
B1
B2
B3
3L2
5L3
40 Nm - 354 lb.in
PSTB 370...470
1L1
2T1
4T2
6T3
3L2
5L3
1L1
3L2
5L3
45 Nm - 443 lb.in
PSTB 570...1050
2T1
4T2
6T3
1L1
2T1
4T2
6T3
B1
B2
B3
3L2
5L3
1L1
2T1
4T2
6T3
B1
B2
B3
3L2
5L3
4 mm
Figure 6: Tightening torques and cable sizes
Figure 5: Protective earthing.
Low Voltage Products & Systems
5.3
ABB nc. • 888-385-1221 • www.abb-control.com
1SXU 132 021 M0201
5