Operating Principle - Westpow STR.B Series User Manual

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Hot Air Out
Hot Air Out
Soft starter
STR STR
Cool Air in
Figure 3-2
OPERATION 06
MENU
Hot Air Out
Hot Air Out
Ventilation
Figure 3-3

Operating Principle

Operating Principle
4 4
There are three pairs of anti-parallel thyristors connected to the stator of 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. Using the electric switch feature of the thyristors, the voltage of the
motor can be controlled by changing the triggering angel of the thyristors. motor can be controlled by changing the triggering angel of the thyristors.
The triggering angel of the thyristors is controlled by microprocessor. So 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 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 full voltage, it outputs a bypass signal. User can use this signal to control
the bypass contactor to supply the motor. See figure4-1. the bypass contactor to supply the motor. See figure4-1.
380V / 660V/1140V 380V / 660V/1140V
Voltage test Drive circuit Voltage test
Drive circuit
Figure 4-1
User Manual User Manual
Motor Motor
Current test Current test
OPERATION 07
MENU