01/02 AWB8230-1413GB
Voltage/frequency
characteristic and voltage
boost
109
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 boost, in contrast,
the voltage is boosted 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 U/f characteristic) or 01
(quadratic U/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 DF6 frequency inverter (see below). Under PNU A045, set the
voltage gain of the DF6 frequency inverter. PNU A045 relates to
the voltage set under PNU A082.
Figure 105: 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
Manual boost
percentage
j j 0.0 to 20 % Setting the voltage increase with manual voltage boost. 1.0
A043
A243
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
efesotomasyon.com - Klockner Moeller - inverter
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