Optimising the operating behaviour
Boost correction with V/f characteristic control
6.11
6.11.3
6.11−5
EDSVF9383V EN 7.1−04/2012
6.11.3 Boost correction with V/f characteristic control
In the V/f characteristic control mode (C0006 = 5), a constant voltage boost
(in [%] von C0090) can be preset in code C0016 at low speeds or motor
standstill.
If due to the setting in C0016 no current or a nonuniform current flows, the
voltage boost can be further increased via the boost correction to inject a
sufficiently high and uniform current into the motor.
If the voltage boost is insufficient, the following drive behaviour occurs:
ƒ The required torque is not achieved at standstill.
ƒ When the load is accelerated from standstill, the current overshoots as
the motor had not been magnetised sufficiently before. OC1 can trip.
Note!
If the motor magnetising current is too low, Lenze recommends
to operate the controller with sine−wave modulated switching
frequency (C0018 = 0, 1, 4, 5 oder 6) only.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0080 Vp field CTRL 0.50 0.00 {0.01 } 0.99 Influence on the motor
magnetising current selected
under C0095
l Not effective with C0006 = 1
and C0025 > 1 at the same
time
l Influence is effective from 0 Hz
to the frequency selected
under C1583
6.6−1
C0095
Mot Io à 0.0 {0.1 A} 1000.0 Motor magnetising current
à dependent on C0086, C0088
and C0091
l Change of C0086 sets C0095 to
the Lenze setting
l Change of C0095 sets
C0086 = 0
6.6−1
C1583 fset high 100.0
0
0.00 {0.01 %} 199.99 Alterations by Lenze service only!
Adaptation of the motor
magnetising current set in C0095
(with V/f characteristic control:
influence limit of the boost
correction; with vector control:
influence limit of the field
precontrol)
l The output frequency is set up
to which the motor
magnetising current set in
C0095 is to have an effect.
l C1583 = 100 % ¢ half the
rated motor frequency in
C0089
6.11−5
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