Lenze i55AE155F

8.3 Opmisaon of motor control
Optimisation of the control loopsOptimisation of motor controlSetting of motor data Motor control selection
The inverter provides dierent funcons by means of which the drive behaviour can be fur-
ther opmised.
Funcon Motor control type
VFC open
loop
VFC closed
loop
SC-ASM SL-PSM SLVC
V/f voltage boost ^ 183
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The parameterisable voltage boost makes it possible to improve the
starng performance for applicaons requiring a high starng tor-
que.
Skip frequencies ^ 184
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By means of the three parameterisable skip frequencies, crical fre-
quencies can be suppressed which lead to mechanical resonances in
the system.
Opmising the stalling behaviour ^ 186
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For special motors which enable an operaon in the eld weakening
range, the behaviour in the eld weakening range can be adapted to
the motor.
Slip compensaon ^ 188
l
In case of a load, the speed of an asynchronous motor decreases.
This load-dependent speed drop is called slip. The slip compensaon
serves to counteract the load-dependent speed loss.
Oscillaon damping ^ 190
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The oscillaon damping serves to reduce the oscillaons during no-
load operaon which are caused by energy oscillang between the
mechanical system (mass inera) and the electrical system (DC bus).
l
For controlling a permanent-magnet synchronous motor, the pole
posion - the angle between the motor phase U and the eld axis of
the rotor - must be known. This funcon serves to detect the pole
posion for the currently acvated motor encoder.
VFC open loop
VFC closed loop
SC-ASM
SL-PSM
SLVC
= V/f characterisc control
= V/f characterisc control with speed feedback
= servo control for asynchronous motor
= sensorless control for synchronous motor
= sensorless vector control
Motor control
Opmisaon of motor control
182