Toshiba Tosvert VF-AS1 User Manual download pdf (Page 139)

E6581301

F-27

6.14.4 Reverse run prohibition

H : Reverse run prohibition selection

• Function

This function prevents the motor from running in the forward or reverse direction when it receives the wrong

operation signal.

[Parameter setting]

Title Function Adjustment range Default setting

H Reverse-run prohibition selection

:Permit all, :Prohibit reverse run

:Prohibit forward run



Warning

• If an operation command is entered to rotate the motor in the direction prohibited for the preset speed

operation with the mode or forced jog operation, this parameter will cancel the command regardless of

operation mode.

• If the motor constant is not set properly while vector control mode or automatic torque boost mode is

selected, the motor may turn in the reverse direction. The number of revolutions that correspond to the slip

frequency, in these modes, therefore, the stop frequency (

H

) should be set at the same level as the

slip frequency. In sensor vector control mode (





), depending on the setting of

WX

, the motor

restarted may rotate in the direction opposite to the prohibited direction regardless of the setting of this

parameter.

6.15 Drooping control

H : Drooping gain

H

: Speed at drooping gain 0%

H

: Speed at drooping gain H

H

: Drooping insensitive torque

H

: Drooping output filter

• Function

When multiple inverters and motors are used to operate a system, the load can distribute to them using this

function. These parameters allow you to adjust the frequency range, and also insensitive torque and gain.

Frequency

Drooping gain

Drooping insensitive torque

Internal torque

command

Drooping gain

H

–

H

H

– H

H

–

H

Drooping insensitive frequency

Gain2

Gain1

[Parameter setting]

Title Function Adjustment range Default setting

H Drooping gain ~% 

H Speed at drooping gain 0% ~Hz 

H Speed at drooping gain H ~Hz 

H Drooping insensitive torque ~% 

H Drooping output filter ~ rad/s 

• Drooping control can be performed only when RV is set to , ,  or .

• When torque over the insensitive torque is applied, the frequency is decreased (during power running) or 6

increased (during regenerative braking).

• The drooping function is operative at frequencies over the frequency set with H.

• In the frequency range between the frequencies set with H and H, the degree of drooping changes

according to the magnitude of frequency.

• The error in drooping insensitive torque increases in the frequency range above the base frequency, and it is

therefore recommended that these functions be used at frequencies below the base frequency.

• During drooping control, the output frequency is not restricted by the maximum frequency (HJ).

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Toshiba Tosvert VF-AS1 User Manual Page 139

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