8 3RW3 semiconductor motor control unit (soft starter) - Siemens ...
8 3RW3 semiconductor motor control unit (soft starter) - Siemens ...
8 3RW3 semiconductor motor control unit (soft starter) - Siemens ...
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<strong>3RW3</strong> <strong>semiconductor</strong> <strong>motor</strong> <strong>control</strong> <strong>unit</strong><br />
Supply interruption in<br />
bypassed state<br />
If the load voltage is switched off in the bypassed state while the auxiliary<br />
supply continues to be applied at terminals A1/A2, the <strong>soft</strong> <strong>starter</strong> performs<br />
a direct start of the <strong>motor</strong> after the load voltage is switched on again. To prevent<br />
this, the "on" command must be removed in the event of the loss of the<br />
main voltage.<br />
The following graphic illustrates what happens when the supply is interrupted<br />
in the bypassed state:<br />
L1-L2-L3<br />
A1-A2<br />
IN<br />
Bypass<br />
T1-T2-T3<br />
U N<br />
U S<br />
Direct start<br />
Control supply<br />
voltage on<br />
Main voltage<br />
on<br />
Start command<br />
Startup completed<br />
Bypass closes<br />
Failure of the<br />
main voltage<br />
Main voltage<br />
returns<br />
To avoid a direct start after the return of<br />
the main voltage, the ON command must<br />
be removed in the event of the failure<br />
failure of the main voltage (T off >= xx ms)<br />
Fig. 8-19: Supply interruption in the bypassed state<br />
SIRIUS System Manual<br />
8-34 GWA 4NEB 430 0999-02c
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