Toshiba TOSVERT VF-A7 Bedienungsanleitung

E6581179②

- 1-

TOSVERT VF-A7/P7

Instruction Manual for Parameters

f480 and f481

Thank you for purchasing the Toshiba industrial inverter "TOSVERT VF-A7/P7".

This manual describes the functions of the f480 and f481 parameters for the inverter TOSVERT VF-

A7/P7.

Title Communication

No. Function Adjustment range

Minimum

setting unit

(Panel/

Communication

)

Default

settin

f480 0480

Exciting

strengthening

coefficient

0~255 1/1 64

f481 0481 Over-excitation

cooperation

0 : Enabled

1 : f480 effective

2 : Enabled

(

Overcurrent control

)

*1

3 : f480 effective

(

Overcurrent control

)

-0

*1 These are not before CPU version V312.

Vector control

Title Write during

running Speed

control

Torque

control

Position

control

V/f

Constant

f480

f481 Enabled ●/- ●/- - -

Sensorless vector / Vector with sensor (●: valid, - : invalid)

1. Functions

These parameters are used to adjust the reference excitation current characteristic in low-speed

range when sensorless vector control is exercised.

By default, these parameters are set so that the excitation current will be boosted in low-speed range

to increase the output torque.

When the overcurrent occurs in a start and a low-speed driving, it can be controlled by setting f481

to 2 or 3.

2. Parameter setting

Title Function Adjustment range Setting value

pt Motor control mode

selection 0~9 2,3,4,6,7

f480 Exciting strengthening

coefficient 0~255 0~255 *2

f481 Over-excitation

cooperation

0 : Enabled

1 : f480 effective

2 : Enabled

(Overcurrent control)*1

3 : f480 effective

(Overcurrent control) *1

0~3

*1 These are not before CPU version V312.

*2 Selecting a too large coefficient might cause the inverter to trip.

You have to set parameter f481 to 1 or 3 for the setting of parameter f480 to take effect.

E6581179②

- 2E -

3. Reference excitation current characteristic

f481=0,2 f481=1,3

4. How to set the parameter

a) If the default settings allow the motor to produce enough torque, there will be no need to change

the settings of these parameters.

b) If you want to decrease the excitation current when no load is applied, set f481 to 1 and

decrease the setting of f480 to bring the current down to the desired level.

c) If a brake is applied at the start of operation, set f480 to 0 and f481 to 1 so that the

excitation current will not be boosted.

d) When the overcurrent occurs in a start and a low-speed driving, set f481 to 2 or 3.



128

Reference excitation

current [multiple]

Operation

frequency

[Hz]

1.0

3Hz(fixed)

0Base

frequency

(vl)

1+0.5×α*3

*3 : αis a coefficient between 0 and 1. It is 1 at 3Hz, while it is 0 at the frequency at point *4 shown above.

*4 : The operation frequency at this point varies depending on the vl setting and the motor characteristics. For example, if vl is

set at 60Hz and the motor capacity is 200V-3.7kW, the frequency at this point is approximately 45Hz.

1.0

3Hz(fixed)

1.5

Base

frequency

(

)

*4 *4

Operation

frequency

[Hz]

1+ ×α*3

128

Reference excitation

current [multiple]

Andere Handbücher für TOSVERT VF-A7

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