General; Electrical Connection; Considerations When Controlling Two Of Three Phases - ABB PSE 18 Installation And Commissioning Manual

L1
L2
L3
N
L N
KM1
1L1 3L2 5L3 1 2
2T1 4T2 6T3
U V W
M
3
Figure 5.1: Connection of PSE Softstarter and con-
nection in series with a line contactor.
32 Chapter 5 Softstarters Type PSE18...PSE370 Installation and commissioning manual 1SFC132057M0201
Start Stop
8 9 11
Start
Stop
8 9 10 11 12 13 14
Run TOR Fault
NC NO
3 4 5 6 7
Chapter 5 Connection
This chapter describes the electrical connections as well as connections for com-
munication devices that have to be made before you can use the softstarter.

5.1 General

Caution!
Mounting and electrical connection of the softstarter shall be made in ac-
cordance with existing laws and regulations and be performed by autho-
rized personnel.
Warning!
Hazardous voltage. Will cause death or serious injury. Turn off and lock out
all power supplying this device before starting work on this equipment.
For basic connection, see Chapter 2 Quickstart.
For circuit diagrams for connection of the softstarter, see Chapter 11 Wiring
diagrams.

5.2 Electrical connection

5.2.1 Considerations when controlling two of three phases

Even when stopped, there will be a voltage on the motor on phase 2. This will
not start the motor and the motor will not be heated up (compare with inside
delta connection). For more information about two phase control see Chapter 3
Description.
Semiconductors do not replace air isolation and the recommended solution is to
use a line contactor to break the current. See figure 5.1.
Caution!
Depending on the two phase control a connected motor terminal always
carries live voltage. Touching terminals and other live parts can result in
death or serious injury.