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E6581301
F-26
6
{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. Note that no
limit is imposed on the output voltage if the supply voltage is not compensated.
[Parameter setting]
Title Function Adjustment range Default setting
XNX
Base frequency voltage
1
(output voltage
adjustment)
V class:~ V
V class:~ V
200V class:
400V class:
H
Base frequency voltage
selection
(correction of supply
voltage)
:
Without voltage compensation (limitless output voltage)
:
With voltage compensation (limitless output voltage)
:
Without voltage compensation (limited output voltage)
:
With voltage compensation (limited output voltage)
ŬIf H is set to or , the output voltage will change in proportion to the input voltage.
ŬEven if the base frequency voltage (XNX) is set above the input voltage, the output voltage will not exceed the
input voltage.
ŬThe rate of voltage to frequency can be adjusted according to the rated motor capacity. For example, setting
H to prevents the output voltage from increasing, even if the input voltage changes when the operation
frequency exceeds the base frequency.
ŬWhen the V/f control mode selection parameter (RV) is set to any number between ~ or ~, the supply
voltage is corrected regardless of the setting of H.
[H
HH
H=
: Supply voltage uncorrected, output voltage
unlimited]
[H
HH
H=
: Supply voltage corrected, output voltage
unlimited]
Input
voltage
High
Low
Output frequency
Output
voltage
[V]
XN
0
Input voltage
Input
voltage
High
Low
Output voltage
[V]
Output frequency
XN
0
XNX
* The above applies when V/f control mode selection
parameter RV is set to , or .
XNX
Rated voltage
>1 the output voltage can be
prevented from exceeding
the input voltage.
* Note that a voltage higher than XNX is applied at
output frequencies over the base frequency XN
, even
if XNX is set below the input voltage.
[H
HH
H=
: Supply voltage uncorrected, output voltage
limited]
[H
HH
H=
: Supply voltage corrected, output voltage
limited]
XN
Input
voltage
High
Low
Output frequency
Output
voltage
[V]
0
Input voltage
XNX
Input
voltage
High
Low
Output voltage
[V]
Output frequency
XN
0
XNX
* The above applies when V/f control mode selection
parameter RV is set to , or .