Range; Oscillation Damping In The Field Weakening Range - Lenze L-force HighLine C 8400 Series Reference Manual

8400 HighLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.10.7.2

Oscillation damping in the field weakening range

When the max. possible output voltage (full modulation) has been reached, a voltage dip
in the DC bus causes a voltage fluctuation in the motor. With load and during no-load
operation this voltage fluctuation can cause mechanical oscillations.
The "oscillation damping field weakening" adjustable in
maximum output voltage. This can be used to always compensate voltage dips in the DC
bus to the output voltage (constant output voltage). This serves to prevent mechanical
oscillations due to these voltage dips.
Parameter
C00236
 With the Lenze setting of
voltage dips in the DC bus in the output voltage for the single-phase and three-phase
devices can largely be compensated so that no speed oscillations may be expected.
Thus, an adaptation of
 Maximum output voltage to be reached with Lenze setting of C00236:
– Single-phase devices: 98.2 %
– Three-phase devices: 99.7 %

Note!
The limitation of the output voltage via
range (high speeds) causes a reduction of the max. possible output torque
(stalling torque).
• If the output torque to be reached in the extreme field weakening range is not
sufficient (motor is stalling too early), reduce the setting in C00236.
With servo control (SC), the Lenze setting of
Otherwise the field weakening control could not work optimally anymore (the
behaviour at high speeds may get worse). When servo control (SC) has been
selected, the oscillation damping in
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Info
Oscillation damping field weakening
• Setting "0" ≡ 100 % output voltage can be reached
C00236 the limitation of the output voltage is set so that
C00236 is not required in the majority of cases.
L
C00236
C00236 in the extreme field weakening
C00236 should not be reduced.
C00236 should never be set to "0".
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
serves to limit the
Lenze setting
Value Unit
14