Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 211
8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.9.7.2 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 C00236
serves to limit the
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.
With the Lenze setting of C00236
the limitation of the output voltage is set so that
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 C00236
is not required in the majority of cases.
Maximum output voltage to be reached with Lenze setting of C00236
:
– Single-phase devices: 98.2 %
– Three-phase devices: 99.7 %
How to eliminate speed oscillations in the field weakening range:
1. Approach the area where the speed oscillations occur.
2. Reduce the speed oscillations by changing C00236
step by step (increment 1).
3. These can be indicators for smooth running:
• Constant motor current characteristic
• Reduction of the mechanical oscillations in the bearing seat
Parameter Info Lenze setting
Value Unit
C00236 Oscillation damping field weakening
•Setting "0" ≡ 100 % output voltage can be reached
14
Note!
The limitation of the output voltage via C00236 in the extreme field weakening
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
.
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