YASKAWA V1000 Series Technical Manual page 81

No. Parameter Name
C1-10 Accel/Decel Time Setting Units
<1> The parameter can be changed during run.
<2> The setting range for the acceleration and deceleration times is determined by C1-10 (Accel/Decel Time Setting Units). For example, if the time is set in units of 0.01 s (C1-10 = 0), the setting
range becomes 0.00 to 600.00 s
WARNING! Sudden Movement Hazard. Rapid deceleration may cause the drive to fault on an overvoltage condition, resulting in death or serious injury due to an uncontrolled
motor state. Set an acceptable deceleration time in parameter C1-09 when using the Fast-stop feature.
Accel/Decel Time Setting Units
n
Set the units for the acceleration and deceleration times using parameter C1-10 (default = 1).
Setting
0 Time is set in units of 0.01 s, making the setting range 0.00 to 600.00 seconds.
1 Time is set in units of 0.1 s, making the setting range 0.0 to 6000.0 seconds.
Switching Accel/Decel Times with Digital Input Terminals
n
Up to four different acceleration / deceleration times can be selected using any two digital input terminals S1 through S7.
Program two parameters H1-01 through H1-07 to "07" (Accel/Decel Time 1) and "1A" (Accel/Decel Time 2). The combination of these two inputs
activates the acceleration/deceleration times as shown below. As the contacts of the terminals open and close, the following acceleration and deceleration
time combinations are possible:
Accel/Decel Time 1
H1-oo = 7
Open (not selected)
Closed
Open (not selected)
Closed
Automatically Switching Acceleration/Deceleration Times
n
The drive can automatically switch between acceleration and deceleration times.
When the output frequency reaches the value set to C1-11, the drive will switch acceleration and deceleration times as shown in the figure below. Setting
C1-11 to 0.0 Hz disables this function.
Using S-Curve Characteristics during Acceleration/Deceleration
n
Using S-curve characteristics to smooth acceleration and deceleration minimizes abrupt shock to the load. Set S-curve characteristic time during
acceleration/deceleration at start and acceleration/deceleration at stop.
Note: 1. Setting S-curve characteristics will lengthen accel/decel times as follows: Accel Time = Selected Accel Time + (C2-01 + C2-02)/2 Decel Time = Selected Decel Time +
(C2-03 + C2-04)/2
2. Set longer S-curve times using PM Open Loop Vector Control.
Setting Example
Figure 4.22 illustrates S-curve characteristics switching between forward and reverse.
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Sets the setting resolution of C1-01 to C1-09.
0: 0.01 s (0.00 to 600.00 s)
1: 0.1 s (0.0 to 6000.0 s)
Accel/Decel Time 2
H1-oo = 1A
Open (not selected)
Open (not selected)
Closed
Closed
Output Frequency
C1-11
Accel/Decel Time
Switch Frequency
C1-07 C1-01
setting setting
When the output frequency ≥ C1-11, drive uses Accel/Decel Time 1 (C1-01, -02)
When the output frequency < C1-11, drive uses Accel/Decel Time 2 (C1-07, -08)
Figure 4.21 Accel/Decel Time Switching Frequency
Forward Run
Command
Reverse Run
Command
C2-02
C2-03
Output
Frequency
C2-01
Figure 4.22 S-Curve Characteristics
Description
Description
Acceleration Time
C1-01
C1-03
C1-05
C1-07
C1-02 C1-08
setting setting
C2-04
C2-04
C2-01
C2-03
C2-02
4.6 Basic Drive Setup Adjustments
Setting Range Default
0, 1
Deceleration Time
C1-02
C1-04
C1-06
C1-08
1
4
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