Prohibiting The Reverse Operation - Toshiba TOSVERT VF-P7 Instruction Manual

☆ The ratio of the voltage to the frequency can be adjusted to the motor capacity. Setting
 at  enables the inverter to prevent the output voltage from increasing with the
input voltage when the operation frequency is higher than the base frequency.
[=
: no voltage compensation/not limited
input

×
voltage
Rated voltage
Output
voltage
[V]
0
Output frequency
＊＝, , 

Rated voltage
[=
: no voltage compensation/limited
input

×
voltage
Rated voltage
Output
voltage
[V]
0
＊＝, , 

Rated voltage

6.13.7 Prohibiting the reverse operation

 ：Reverse-run prohibition
・Function
The function prevents the direction of operation from being reversed in case an in
correct operation signal is given.
[Parameter setting]
Title

(*1): Top priority is given to the command specifying the direction of rotation (forward run or reverse
run command).In preset-speed operation mode or forced jog run mode, you can prevent the motor
from rotating in the opposite direction to that specified by the forward run or reverse run command.
Caution!
･ This parameter is invalid in positioning mode. In addition, if the motor runs in a prohibited direction in
preset-speed mode or forced jog run, operation commands become invalid irrespective of the control mode.
･ If the motor constant is not set optimally in vector-control, automatic-torque boost mode, the motor may
slightly run in reverse direction because of the slip frequency. Before using this parameter, set parameter
 (stop frequency) at a frequency close to the slip frequency. When the inverter is in sensor vector
control mode ( =  and  = ), depending on the setting of , the motor may rotates in the
opposite direction to that prohibited when it is turned off and then on again, regardless of the setting of this
parameter.

＞1: no voltage higher than
the input voltage is put out.
Input voltage
Output frequency

＞1, no voltage higher than
the input voltage is put out.
Function
Reverse-run
: Permitted, : Reverse run prohibited : Forward run prohibited,
prohibition
: Direction designated by command permitted(
] [=
Input voltage
high

Output
low
voltage
[V]
0
＊The output voltage can exceed  if the output
frequency is higher than the base frequency ##,
even when  is lower than the input voltage.
] [=
high

low
Output
voltage
[V]
0
Adjustment range
F-29
: voltage compensation/not limited
Output frequency

: voltage compensation/limited
Output frequency

*1)
]
Input voltage
high
low
]
Input
voltage
high
low
Default setting
