Toshiba TOSVERT VF-MB1 Instruction Manual page 217

2) Multiplicative override
In this mode, each output frequency is multiplied by an externally override frequency.
[Ex.1: VIA (Reference frequency), VIC (Override input)]
Output
Over-ridden frequency
frequency

0
Ex.1:
f660=0 (Disabled), f661=3 (VIC input), fmod=1 (VIA input), fh=8=0 , ul=8=0
VIA input, ( f201=0 , f202==0 , f203=100 , f204=8=0 )
VIC input ( f216=0 , f220=0 , f218=100 , f221=100 ) 
 Setting of VIA input: Refer to Section 7.3.1, Setting of VIC input: Refer to Section 7.3.2.
Output frequency = Reference frequency × {1 + Override (VIC input [%]/100)}
Ex.2:
f660=0 (Disabled), f661=1 (VIA input), fmod=2 (VIB input), fh=8=0 , ul=8=0
VIB input ( f210=0 , f211==0 , f212=100 , f213=8=0 )
VIA input ( f201=0 , f205=0 , f203=100 , f206=100 ) 
 Setting of VIB input: Refer to Section 7.3.3, Setting of VIA input: Refer to Section 7.3.1.
Output frequency = Reference frequency × {1 + Override (VIA input [%]/100)}
Ex.3:
Title
f729 Operation panel override multiplication gain
Output frequency = Reference frequency × {1 + Override (f729 setting value [%]/100}
[Ex.2: VIB (Reference frequency), VIA (Override input)]
( )
-10V
VIA input
(Reference
frequency)
10V
Function
F-97
Output
frequency
Over-ridden frequency

Forward run
0

Adjustment range
-100 - + 100 %
E6581697
( )
VIB input
(Reference
frequency)
10V
Reverse run
Default setting
0
6