Lenze EVF9383 - Manual (Page 189)

Optimising the operating behaviour
Boost correction with V/f characteristic control
6.11
6.11.3
l
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
s
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
Description