English1/4
Siemens plc 1993
0 10 20 30 40 50 60 70 80 90 100 110 120
10
20
30
40
50
60
70
80
90
100
Voltage
%
Frequency
0
1 2 3
4
5
Boost
Ku
Figure 2:
Voltage/Frequency Characteristic Curves
400
1.4.2 Low Frequency Voltage Boost (Ku)
The output voltage can be boosted in 0.1% steps up to 30% for low frequencies from 0 Hz. This may be required
to give additional starting torque in some applications. The amount of voltage boost decreases linearly until
100% voltage is achieved.
If required, automatic boost may be used
(see section 5.3.2, Parameter P19)
. This measures the motor
characteristics and selects a suitable boost voltage at first switch–on.
1.4.3 Current Limit
The maximum output current available from the inverter can be adjusted to provide thermal protection of the
motor and/or limit the maximum motor torque
(see section 5.3.2, parameters P17 and P18)
.
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