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Instruction Manual for Parameters
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.
Communication
Title
No.
0480
f480
0481
f481
*1 These are not before CPU version V312.
Write during
Title
running
f480
Enabled
f481
Sensorless vector / Vector with sensor (
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
Motor control mode
pt
selection
Exciting strengthening
f480
coefficient
Over-excitation
f481
cooperation
These are not before CPU version V312.
  *1 
Selecting a too large coefficient might cause the inverter to trip.
  *2 
You have to set parameter f481 to 1 or 3 for the setting of parameter f480 to take effect.
    
TOSVERT VF-A7/P7
f480 and f481
Function
Exciting
strengthening
coefficient
Over-excitation
cooperation
Vector control
Speed
Torque
control
control
/-
Function
0~9
0~255
0 : Enabled
1 : f480 effective
2 : Enabled
3 : f480 effective
Adjustment range
0~255
0 : Enabled
1 : f480 effective
2 : Enabled
(Overcurrent control)
3 : f480 effective
(Overcurrent control)
Position
Constant
control
/-
-
: valid, - : invalid)
Adjustment range
(Overcurrent control)
(Overcurrent control)
- 1 -
Minimum
setting unit
(Panel/
Communication)
1/1
-
*1
*1
V/f
-
Setting value
2,3,4,6,7
0~255
0~3
*1
*1
E6581179
Default
setting
64
0
 *2

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   Summary of Contents for Toshiba TOSVERT VF-A7

  • Page 1 E6581179 ② 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. Minimum Communication...
  • Page 2 E6581179 ② 3. Reference excitation current characteristic f481 =0,2 f481 =1,3 f480 Reference excitation Reference excitation α × current [multiple] current [multiple] 1+0.5×α f480 Operation Operation frequency frequency Base Base    [Hz] [Hz] 3Hz(fixed) 3Hz(fixed) frequency frequency (vl) (vl) *3 : α is 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.

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Tosvert vf-p7

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