NIetz Electric Co.,Ltd
Soft starter SSN/SSA serie User Manual
9
Hot airHot air Hot airHot air
Cool air
Ventilation
Figure3-2
Horizontal layout
Figure3-3
Vertical layout
Soft Starter Soft Starter
4. Operating principle
There are three pairs of anti-parallel thyristors connected to the stator of motor. Using
the electric switch feature of the thyristors, the voltage of the motor can be controlled by
changing the triggering angel of the thyristors. The triggering angel of the thyristors is
controlled by microprocessor. So the motor can be started softer and smooth. After the equipment
is up to full voltage, it outputs a bypass signal. User can use this signal to control the bypass
contactor to supply the motor. See figure4-1.
Moter
R.S.T
3-phase AC power supply
AC 380V/660V/1140V
KM
Votage
detecting
drive circuit
Current
detecting
Computer fuzzy control
Keyboard 、display
U.V.W
Figure 4-1
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