5
ANTRIEBSTECHNIK
6
55
KEB COMBIVERT F4-C
Name: Basis
28.01.98
6
© KEB Antriebstechnik, 1997
All Right reserved
Adjustment U/f-Characteristic Functional Description
Section
Page
Date
Chapter
Picture 6.5.5.c Example: Deceleration of a drive with high inertia load from 80 Hz
with UZK-compensation without UZK-compensation
actual Load
Motor Voltage
Actual frequency
DC-link voltage
actual Load
Motor Voltage
Actual frequency
DC-link voltage
6.5.6 Modulation
For applications that require a lot of torque the KEB COMBIVERT can be operated
with overmodulation. Through overmodulation more voltage is available at the motor,
thus the slip and the actual load become smaller while the torque remains the same.
uF.10 Type of modulation
0 / 2 with overmodulation
1 / 3 without overmodulation (standard)
The settings 0 and 2 or 1 and 3 are identical and exist only for reasons of compatibility
to former units.
For some consumers (trafos) it is necessary to increase the minimum output frequency
(standard 0Hz). If a frequency is adjusted in uF.9 > 0Hz, then all output
frequencies < uF.9 are suppressed and the modulation is deactivated. The acceleration
and deceleration ramps start respectively end at this frequency. The switching off
and on of the modulation at exceeding or falling below uF.9 is done without hysteresis.
At analog setpoint value setting is must be ensured, that the setpoint value is not in
the range of uF.9.
Type of Modulation (uF.10)
Modulation / Lower Limit (uF.9)
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