2. Energy-saving run
During actual running, the VFD can search for the max. efficiency point to keep running in the most
efficient state to save energy.
Note:
(1) This function is generally used in light load or no-load cases.
(2) This function does not fit in cases where load transient is required.
3. V/F slip compensation gain
SVPWM control belongs to open-loop mode, which will cause motor speed to fluctuate when motor
load transients. In cases where strict speed requirement is needed, users can set the slip
compensation gain to compensate for the speed variation caused by load fluctuation through internal
output adjustment of VFD.
The set range of slip compensation gain is 0–200%, in which 100% corresponds to rated slip
frequency.
Note: Rated slip frequency= (rated synchronous speed of motor-rated speed of motor) × number of
motor pole pairs/60
4. Oscillation control
Motor oscillation often occurs in SVPWM control in large-power drive applications. To solve this
problem, the ST600 Series VFD sets two function codes to control the oscillation factor, and users can
set the corresponding function code based on the occurrence frequency of oscillation.
Note: The larger the set value, the better the control effect, however, if the set value is too large, it
may easily lead to too large VFD output current.
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