Ü r . f, 5 l l, Acc/dec patterns – Toshiba Tosvert VF-A5 User Manual

Page 55: Acc/dec pattern adjustment, low/high

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ü r . F

(Fundamental Parameters #1)

Acc/Dec patterns,

5 L L

E H ~

■

Acc/Dec pattern adjustment, Low/High

Related parameters

SCu 1

Acc/Dec pattern #1

SCL

Acc/Dec pattern adjustment

SCH

Acc/Dec pattern adjustment (HIGH)

An acc/dec pattern that matches the application c a n be selected.

SCu I set to 0 (Linear acc/dec)

This is a general acceleration/deceleration pattern, and is used under

most circumstances.

SCu I set to I (Self-adjusting function) An acceleration/deceleration time that matches the load conditions

is automatically set.

Self-adjusting function

This function cannot be used when the frequency reference constantly fluctuates or when the load

changes suddenly. The |ncc j jdEC | parameters will be automatically changed, but when the control
power is turned OFF, the settings will return to their original values.

To save the self-adjusting function results, display jflCC ] ^

the data setting blink by pressing the

write the data
Set C/-.F?

in 0 r . U , press ENTER , make

keys once, and then press

ENTER

S C u S I

for^ andpECE.

SCu I

set to 3 (S-Pattern

#1)

SCu

I set to 3 (S-Pattern #2)

This pattern is used when accelerating/decelerating to a high speed

area (exceeding 60Hz) is required in a short time. This pattern is
suitable for conveyers, etc.
This pattern gradually accelerates in the field-weakening area where
the motor’s acceleration torque is small. This pattern is suitable

for high-speed spindles.

Examples of acceleration/deceleration pattern settings

SCu / set to 3

(Adjusted with

5CL and 5CH )

SCu 1 set to 3

(Adjusted with maximum voltage frequency)

Output
frequency

Output

Note that actual acceleration/deceleration times of the S-pattern will be longer than the linear times by the values
of *1 and *2.

The curve will depend on the (max. voltage frequency/max. frequency), and the inclination will taper off as the

(max. voltage frequency/max frequency) decrease, and the actual acceleration time will increase. (The rate of

acceleration will decrease in the field-weakening area.)