E6581301 F-26
6
{Supply voltage correction ······· Maintains a constant V/f rati o, even when the input voltage fluctuates.
{Output voltage adjustment ······ Limits the voltage at frequencies exceeding the base freque ncy. Note that no
limit is imposed on the output voltage if the supply voltage is not compen sated.
[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 compens ation (limitless output voltage)

:

With voltage compensat ion (limitless output voltage)

:

Without voltage compe nsation (limited output voltage)

:

With voltage compensat ion (limited out put voltage)

"If H is set to or , the output voltage will change in proportion to the input voltage.
"Even if the base frequency voltage (XNX) 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 ra ted motor capacity. For example, setting
H to prevents the output voltage from increasing, even if the input vo ltage changes when the operation
frequency exceeds the base frequency.
"When the V/f control mode selection parameter (RV) is set to any nu mber between ~ or ~, the supply
voltage is corrected regardless of the setting of H.
[H
HH
H=
: Supply voltage uncorrected, output voltage
unlimited]
[H
HH
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
if XNX is set below the input voltage.
[H
HH
H=
: Supply voltage uncorrected, output voltage
limited]
[H
HH
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 .