134
PT ratio=50 (input AC 0-500V, output DC 0-10V)
When output reaching the target voltage 456V, the feedback voltage of PT output is
456/50V=9.12V
AI1 upper limit input is 10V, input voltage is 500V, the ratio to rated voltage value is
500/380=132%
So F6.09 (AI2 input upper limit voltage) can be set as 10.00V, F6.10 (AI2 upper limit corresponding setting) can be set at
132%.
2
:
VF fully separated mode, voltage open-loop output
In this mode, output frequency and voltage of VFD are completely independent. Frequency changes according to
set acc/dec time, voltage is adjust to target value according to rise/fall time defined by F5.19, F5.20, as showed in figure
F5-7. This control mode is mainly applied in designing of some variable-frequency power source.
Fig. F5-7 Voltage Control Mode 2
3
:
VF fully separated mode, voltage closed-loop output
The only difference of this mode from mode 2 is that it introduced voltage closed-loop. Through PI adjustment of
deviation of feedback voltage compared with set voltage, a steadier voltage can be acquired. This method can
compensate target voltage deviation caused by load change, so as to acquire a higher precision of voltage control and a
faster response.
F5.13
voltage setting channel