YASKAWA T1000V Technical Manual page 134

5.3 C: Tuning
Switching Accel/decel Times by a Frequency Level
The drive can automatically switch from accel/decel times 4 (C1-07 and C1-08) to the default accel/decel times (C1-01
and C1-02 for motor 1, C1-05 and C1-06 for motor 2) when the output frequency exceeds the frequency level set in
parameter C1-11. When it falls below this level, the accel/decel times are switched back.
example.
Note: Acceleration and deceleration times selected by digital inputs have priority over the automatic switching by a frequency level.
For example, if accel/decel time 2 is selected, the drive will use this time only and not switch from accel/decel time 4 to the
selected one.
Figure 5.23
Switching Acceleration and Deceleration Times by Motor Selection
When switching between motor 1 and 2 using a digital input (H1-
decel time 1/2 for motor 1 and C1-05 to C1-08 become accel/decel time 1/2 for motor 2. In this case the digital input
"Accel/Decel Time 2 Selection" can not be used.
Table 5.10 explains the activation of accel/decel times depending on the motor selection and accel/decel time selection.
Accel/Decel Time 1 (H1-
Open
Closed
■ C1-09: Fast Stop Time
Parameter C1-09 will set a special deceleration that is used when certain faults occur or that can be operated by closing a
digital input configured as H1-
continuously, even a momentary closure will trigger the Fast-stop operation.
Unlike standard deceleration, once the Fast-stop operation is initiated, the drive cannot be restarted until the deceleration
is complete, the Fast-stop input is cleared, and the Run command is cycled.
A digital output programmed for "During Fast-stop" (H2-01, H2-02, H2-03 = 4C) will be closed as long as Fast-stop is
active.
No.
C1-09
<1> 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
NOTICE: Rapid deceleration can trigger an overvoltage fault. When faulted, the drive output shuts off, and the motor coasts. To avoid
this uncontrolled motor state and to ensure that the motor stops quickly and safely, set an appropriate Fast-stop time to C1-09.
C1-10: Accel/Decel Time Setting Units
■
Determines the units for the acceleration and deceleration times set to C1-01 through C1-09 using parameter C1-10.
No.
C1-10
134
Output Frequency
C1-11
Accel/Decel Time
Switch Frequency
C1-07
setting
When the output frequency ≥ C1-11, drive uses Accel/Decel Time 1 (C1-01 and C1-02)
When the output frequency < C1-11, drive uses Accel/Decel Time 2 (C1-07 and C1-08)
Figure 5.23 Accel/Decel Time Switching Frequency
Table 5.10 Motor Switching and Accel/Decel Time Combinations
Motor 1 Selected
= 7)
Accel
C1-01
C1-03
= 15 (N.O. input) or H1-
Parameter Name
Fast Stop Time
Parameter Name
Accel/Decel Time Setting Units
C1-01 C1-02 C1-08
setting setting setting
= 16) parameters C1-01 to C1-04 become accel/
Decel
C1-02
C1-04
= 17 (N.C. input). The input does not have to be closed
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Figure 5.23 shows an operation
Motor 2 Selected
Accel
C1-05
C1-07
Setting Range
0.0 to 6000.0 s
<1>
Setting Range
0 or 1
Decel
C1-06
C1-08
Default
10.0 s
Default
1