Voltage Ramp Starting - WEG SSW-08 Manual Del Usuario

Figure 5.2: Characteristic curves of torque and current in a current limitation start
The following items show characteristic curves with the starting torque behavior according to
some types of loads and their suggested controls.

5.1.1 Voltage Ramp Starting

1) Set the value of the initial voltage to a low value;
2) When a load is applied to the motor, set the initial voltage to a value that makes the motor
rotate smoothly from the instant it is started.
3) Set the acceleration time with the necessary start time, initially with short times, 10 to 15
seconds, and afterwards try to find the best starting condition for the used load.
U(V)
NOTE!
With long starting times, or when the motor is without a load, vibration can occur
„
during the start of the motor, therefore lower the starting time;
If faults occur during the start, check all the connections from the Soft-Starter to
„
the supply network, motor connections, supply network voltage levels, fuses and
circuit breakers.
Programming Information and Suggestions
I/In
T/Tn
Current
Torque
Start
0
Enable Voltage Ramp
Figure 5.3: Voltage ramp starting
Tn
100 %Un
t(s)
Disable
5
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