User Manual of A90 Series Inverter
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during start/stop or cannot directly run once enabled by switching the start/stop mode. It is
necessary to first disconnect the running terminal and then close it to start running.
Zero speed check
frequency
When the output frequency is lower than the zero speed judgment frequency, the
terminal “zero-speed running” will be valid.
Initial position search
after power-on or fault
When the synchronous motor is used (e.g. F01.00=2) and subjected to VF control, the
initial angle is essential for the control performance. In particular, reversing may occur at
the moment of start. Thus, the initial position is searched by default after power-on or
failure, in order to achieve a better control performance.
7.6 VF Control Parameter Group of F05 Group
The function codes in this group are valid for V/F control and invalid for vector
control.
V/F control is suitable for general-purpose loads such as fans and pumps, or when
multiple motors are driven by one inverter or the power of the inverter is quite different
from that of the motor.
0: straight line V/F
1: multi-point broken line V/F
2: 1.3-power V/F
3: 1.7-power V/F
4: square V/F
5: VF complete separation mode (Ud
= 0, Uq = K * t = voltage of
separation voltage source)
6: VF semi-separation mode (Ud = 0,
Uq = K * t = F/Fe * 2 * voltage of
separation voltage source)
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