KEB COMBIVERT F5 series Installation Manual & Operation Manual page 24

Basic Adjustment of the Drive
Ramp adjustment with S-curves
+f [Hz]
t1
t2
-f [Hz]
Boost
Rated frequency
24
t1
t1
t3
In the lower speed range losses in the motor become greater. This parameter
can be used to boost the voltage in order to overcome these losses. With
proper adjustment, the torque output of the motor will remain constant even
at the lowest speeds.
Adjustment range:
Resolution:
Factory setting:
Adjustment:
Determine the load level (CP.6) with no-load operation at the
rated frequency.
Then run at about 10 Hz and adjust the torque boost, so that
about the same load level (CP.6) is achieved as with the rated
frequency.
During continuous operation; if the motor operates at low speed and
too much voltage, it can lead to overheating of the motor.
The inverter will output the applied input voltage or the voltage value adjusted
in CP.17 at the frequency value adjusted in this parameter. This param-
eter is typically adjusted for the motor rated frequency. Note: Motors can
overheat when the rated frequency is incorrectly adjusted!
Adjustment range:
Resolution:
Factory setting:
t1 = S-curve time (CP.14)
t2 = Acceleration time (CP.12)
t3 = Deceleration time (CP.13)
t2
t1 t1
t1
t3
t1
0.0...25.5 %
0.1 %
2.0 %
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0...400 Hz
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0.0125 Hz
60 Hz
t1
t [s]
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