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Setting Parameters
01/02 AWB8230-1415GB
126
Voltage/frequency characteristic and voltage boost
Boost
The boost function increases the voltage of the
U
/
f
characteristic
(and consequently boosting the torque) in the lower frequency
range. Manual voltage boost raises the voltage in the frequency
range from the starting frequency (default setting: 0.5 Hz) to half
the base frequency (25 Hz at the default setting of 50 Hz) in every
operating state (acceleration, static operation, deceleration),
irrespective of the motor load. With automatic voltage boost, by
contrast, the voltage is increased according to the motor load.
A voltage boost may cause a fault message and trip due to the
higher currents involved.
Manual voltage boost only has an effect when PNU A044 contains
the value 00 (default, linear
V
/
f
characteristic) or 01 (quadratic
V
/
f
characteristic).
Voltage/frequency characteristics
Under PNU A044 and A045, adjust the behaviour of the DF6 to
match its load. Under PNU A044, set the torque characteristics of
the DV6 frequency inverter (see below). Under PNU A045, set the
voltage gain of the DV6 frequency inverter. PNU A045 relates to
the voltage set under PNU A082.
Linear
V
/
f
characteristic
For a constant torque, enter the value 00 under PNU A044
(default). The DV6 frequency inverter then increases the output
voltage
V
2
on a linear ramp up to the base frequency in
PNU A003.
Figure 123: Voltage boost characteristics
Parameter settings:
A041 = 00
A042 = 50
A043 = 10.0
A044 = 00
A045 = 100
[%]
U
f
[Hz]
0
5.0
25.0
50.0
PNU A042 = 50
PNU A043 = 10 %
100
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
A041
A241
Voltage boost
characteristics
–
–
00
Manual voltage boost, increase always active
00
01
Automatic voltage boost, increase on demand
A042
A242
A342
Manual boost
percentage
j
j
0.0 to 20 %
Setting the voltage increase with manual boost.
1.0
A043
A243
A343
Maximum
voltage boost
at 1 % of the
base frequency
j
j
0.0 to 50 %
Setting the frequency with the highest voltage boost as a
percentage of the base frequency (PNU A003).
5.0
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