3RW3 semiconductor motor control unit
SIRIUS System Manual
8-34
GWA 4NEB 430 0999-02b
Supply interruption in
bypassed state
If the load voltage is switched off in the bypassed state while the auxiliary
supply continues to be applied at terminals A1/A2, the soft starter performs
a direct start of the motor after the load voltage is switched on again. To pre-
vent this, the "on" command must be removed in the event of the loss of the
main voltage.
The following graphic illustrates what happens when the supply is inter-
rupted in the bypassed state:
Figure 8-18: Supply interruption in the bypassed state
L1-L2-L3
A1-A2
IN
Bypass
T1-T2-T3
U
N
U
S
Direct start
Control supply
voltage on
Main voltage
on
Start command
Startup completed
Bypass closes
Failure of the
main voltage
Main voltage
returns
To avoid a direct start after the return of
the main voltage, the ON command must
be removed in the event of the failure
failure of the main voltage (T
off
>= xx ms)
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