Connection
Chapter 5
45
1SFC132003M0201
5:2.1.1 External By-Pass contactor
An external by-pass contactor can be used for softstarters
size PST30...300 (built in for size 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 marking is printed on the front label.
If an external By-pass contactor is used an output relay
should be configured as TOR and be connected to the
contactor. The by-pass contactor is then activated when the
voltage reaches 100% and the current has been below 1.2 x I
e
continuously for 1 s or after a 3 s timeout.
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
1SFC132049F0001
igure 4: Connection of external by-pass
contactor
Figure 5: Protective earthing
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