Toshiba TOSVERT VF-AS3 Manual page 8

Target position
Multi-step
Higher 4
point
digits
7 A592
• Set the limits of the target position to A512 and A513 (on the positive side), and A514 and A515 (on the negative
side).
• Assign the positioning preparation signal (input terminal function 178/179) to the input terminal.
• Assign the run signal (input terminal function 2/3 or 4/5) to the input terminal.
• Assign the multi-step point signal (input terminal function 10/11, 12/13, or 14/15) to the input terminal.
2.2.1.1 About speed and acceleration/deceleration time
Here, description is given by using the parameter for multi-step point 1. The same applies also to multi-step
points 2 to 7.
The frequency at the time of positioning control is as shown in the diagram below.
• Set the steady rate at the time of positioning control to ±Sr1(Hz).
• Set the acceleration/deceleration time until the maximum frequency (FH) is reached to A547 (A548).
The times Tacc and Tdec for acceleration/deceleration are as shown in the formulas below.
Tacc=Sr1 x A547/FH, Tdec=Sr1 x A548/FH
If the position command is Pcmd, it is equivalent to the area of the trapezoid within the straight lines in the
figure above.
Therefore, the time t of the steady rate is obtained as shown in the formulas below.
P =
cmd
P
cmd
t =
Sr 1
The time T required for positioning control is obtained as shown in the formula below.
A 547
T =
Function the time of
Lower 4
setting
digits
A593 A594
Speed (Hz)
Sr1
0
Tacc t
A 547 × Sr 1
Sr 1 × +
2 · FH
A 547 + A 548
− Sr
2 · FH
× Sr 1 A
548
+ t +
FH
Speed at
Acceler- Decel-
ation eration
position
time
control
Sr7 A595
Time
Tdec
A 548 × Sr 1
t +
2 · FH
1
× Sr
1 P
cmd
= +
FH Sr 1
6
Preset speed input signal
1 (SS1) 2 (SS2)
time
A596 x x
x: ON
A 547 + A 548
Sr 1
2 · FH
E6582187
3 (SS3)
x
-: OFF