Toshiba VF-FS1 - Manual (Page 133)

E6581381
F-37
6
6.12.5 Output voltage adjustment/Supply voltage correction
XNX : Base frequency voltage 1
H : Supply voltage correction (output voltage adjustment)
• Function
Base frequency voltage1
The H parameter adjusts the voltage corresponding to the base frequency 1 XN so that no
voltage exceeding the XNX set value is put out. (This function is enabled only when H is set
to either "0" or "1".)
Supply voltage correction
The H parameter maintains a constant V/F ratio, even when the input voltage decreases. The
torque during low-speed operation is prevented from decreasing.
Supply voltage correction: Maintains a constant V/F ratio, even when the input voltage fluctuates.
Limitation of output voltage: Limits the voltage at frequencies exceeding the base frequency. Applied when
operating a special motor with low induced voltage.
[Parameter setting]
Title Function Adjustment range Default setting
XNX Base frequency voltage1
50-330 (V) : 200V class
50-660 (V) : 400V class
230 (WP/WN type)
400 (WP type)
460 (WN type)
H
Supply voltage correction
(limitation of output voltage)
0: Supply voltage uncorrected,
output voltage limited
1: Supply voltage corrected,
output voltage limited
2: Supply voltage uncorrected,
output voltage unlimited
3: Supply voltage corrected,
output voltage unlimited
2
+ If H is set to "" or "", the output voltage will change in proportion to the input voltage.
+ Even if the base frequency voltage (XNX parameter ) is set above the input voltage, the output voltage
will not exceed the input voltage.
+ The rate of voltage to frequency can be adjusted according to the rated motor capacity. For example,
setting H to "" or "" prevents the output voltage from increasing, even if the input voltage
changes when operation frequency exceeds the base frequency.
+ When the V/F control mode selection parameter (RV) is set to any number between and , the supply
voltage is corrected regardless of the setting of H.