Toshiba TOSVERT VF-A7 Stücklistenhandbuch

E6581169

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TOSVERT VF-A7/P7

The function manual of the parameter

“F451” “F452” “F453”

This manual is intended only to describe the typical operation and application of the

product. The technical information contained in this manual does not guarantee the

intellectual proprietary rights or other rights of, or grant a license to, the Toshiba

Schneider Inverter Corporation or third parties, for the use of the technical information or

of the product.

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1. Introduction

Thank you for your purchase of our industrial inverter “TOSVERT VF-A7/P7”.

This manual gives explanations of parameters “H, H, H” for the VF-A7/P7 inverter.

2. Functions

In the case the inverter is applied to lifting machines (crane, hoist, etc.), these parameters are used for

cooperation with the mechanical brake operation (H) and load falling prevention in winding up/down

operation (H, H).

3. Related parameters

Vector control

Title

Commu-

nication

Function Adjustment range

Min. unit (panel/

communication)

Default

setting

Write during

running Speed

control

Torque

control

Position

control

V/f

Constant

H 0451 Torque limit mode

0: Standard,

1: without speed

cooperation

−0 Enabled ●/●− − ●

H 0452

Continuous stall trip

detection

time during power running

0.0〜1.0 [s] 0.01/0.01 0.0 Enabled ●/●− − ●

H 0453 Stall prevention during

regeneration

0: Stall

1: Stall is prevented −0 Enabled ●/●− − ●

Sensorless vector/vector with sensor (

●

: Valid，−: Invalid)

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4. Function of parameter H

H

= 0 mode (standard)

H

= 1 mode (without speed cooperation)

Operation frequency is controlled

when torque limit is activated.

Therefore, actual speed is

controlled to follow the operation

frequency always.

Since the operation frequency is

raised after torque declines with

release of the mechanical brake,

the time that the actual speed

corresponds to the operation

frequency is time lag in

mechanical brake operation +

acceleration time.

When the inverter is used in combination with the mechanical brake of a lifting machine (crane, hoist,

etc.), the load fall by torque reduction can be prevented by carrying out the shortest acceleration of the

mechanical brake operation delay time.

Moreover, this parameter raises response in inching operation in order to control the load not to slip

down.

Frequency [Hz]

Time [s]

Torque [N⋅m]

Time [s]

Torque limit

level

ctual speed

When torque limit is

not activated

Operation frequency

Time [s]

Mechanical

brake

ON OFF

(Released)

Operation frequency becomes

high ahead of torque limit even

when it is activated.

When torque declines with release

of the mechanical brake, it is

sustained at the limit level and

actual speed is controlled to follow

the operation frequency.

This mode functions not only to

prevent the load from falling but to

raise response in inching

operation.

Frequency [Hz]

Torque [N⋅m]

Time [s]

Torque limit

level

ctual speed

(Acceleration rate is determined

by torque limit.)

Operation frequency

Time [s]

Mechanical

brake

ON OFF

(Released)

Torque limit is sustained after

the mechanical brake is

released.

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5. Function of parameter H

H

= 0.0 mode (power running without continual stall prevention trip)

H

= except 0.0 (power running with continual stall prevention trip)

If stall prevention trip

continually takes place in

lifting operation with overload

(power running), output

frequency is automatically

lowered in order to control the

current. If worst comes to

worst, the load falls because

of a stall.

If stall prevention trip

continually takes place in

lifting operation (power

running) (in the continuos

hours set byH),QV

(overtorque) prevention trip

takes place to prevent the

load from falling caused by

overload.

Frequency [Hz]

Time [s]

Stall prevention

trip level

When stall prevention

is not activated

Operation

frequency

In stall prevention trip

Output current [%]

Falling direction in winding

up operation of lifting

machines.

When the inverter is used in combination with a lifting machine (crane, hoist, etc.), this function

prevents the load from falling because of a stall in overload hoisting (power running).

Frequency [Hz]

Time [s]

Stall prevention

trip level

When stall prevention

is not activated Operation frequency

H

Output current [%]

QV (overtorque) prevention

trip resulting from continual

stall prevention trip in the set

hours.

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6. Function of parameter H

H

= 0 mode (stall in regeneration)

H

= 1 mode (stall is prevented in regeneration)

Frequency [Hz]

Time [s]

Stall prevention

trip level

When stall prevention

is not activated

Operation frequency

Output current [%]

If stall prevention trip takes

place in winding up operation

(in regeneration), output

current is automatically

increased in order to control

the current. If worst comes to

worst, the load may fall.

Falling direction in winding

down operation of lifting

machines.

Stall prevention is controlled

only in winding down operation

(in regeneration) in order to

prevent the load from falling

and other accidents caused by

unexpected rise in the output

frequency.

When the inverter is used in combination with a lifting machine (crane, hoist, etc.), this function

controls stall prevention in winding down operation (in regeneration) in order to prevent the load from

falling and accident caused by unexpected speed change.

Frequency [Hz]

Time [s]

Stall prevention

trip level

When stall prevention

is not activated

Operation frequency

Output current [%]

When output current increases, the

load is prevented from falling by

QE trip and QN trip.

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