E6580757

6.12.6 Output voltage adjustment/Supply voltage correction

: Output voltage adjustment (Base frequency voltage) : Supply voltage correction

Function

 

 

 

 

 

 

 

 

Output voltage adjustment (Base frequency voltage)

 

 

 

 

The

 

parameter adjusts the voltage corresponding

to the base frequency 1

so that no

 

 

 

voltage exceeding the

 

set value is put out. (This function is enabled only when

is

 

 

 

set to either "0", "1", or "2".)

 

 

 

 

 

Supply voltage correction

 

 

 

 

 

 

The

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.

Output voltage adjustment ............. Limits the voltage at frequencies exceeding the base frequency. Applied

 

when operating a special motor with low induced voltage.

 

 

6

[Parameter setting]

 

 

 

 

 

 

 

 

 

 

 

Title

Function

 

Adjustment range

 

Default setting

 

 

 

 

 

 

 

 

 

 

Output voltage adjustment

0

250 (V), 0 500 (V)

 

200V/400V

 

 

 

(Base frequency voltage)

 

 

 

 

 

 

 

 

 

 

 

0: Supply voltage uncorrected,

 

 

 

 

 

 

 

output voltage limited

 

 

 

 

 

 

1: Supply voltage corrected,

 

 

 

 

 

 

 

output voltage limited

 

 

 

 

 

 

2: Supply voltage corrected (off during slow-

 

 

 

 

 

Supply voltage correction

 

down), output voltage limited

 

1

 

 

 

3: Supply voltage uncorrected,

 

 

 

 

 

 

 

 

 

 

 

 

output voltage unlimited

 

 

 

 

 

 

4: Supply voltage corrected,

 

 

 

 

 

 

 

output voltage unlimited

 

 

 

 

 

 

5: Supply voltage corrected (off during decel-

 

 

 

 

 

 

 

eration), output voltage unlimited

 

 

 

 

If is set to "0" or "3", the output voltage will change in proportion to the input voltage.

Even if the base frequency voltage ( 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 to " " or " " prevents the output voltage from increasing, even if the input voltage changes when operation frequency exceeds the base frequency.

F-31

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Image 115
Toshiba VF-S9 manual Output voltage adjustment/Supply voltage correction, To the base frequency So that no