YASKAWA L1000V Technical Manual page 110

5.3 C: Tuning
Switching Accel/Decel Ramps by a Speed Level
The drive can switch between different acceleration and deceleration ramps automatically. The drive will switch from
accel/decel ramp 4 in C1-07 and C1-08 to the default accel/decel ramp in C1-01 and C1-02 when the output speed
exceeds the speed level set in parameter C1-11. When it falls below this level, the accel/decel ramps are switched back.
Figure 5.4 shows an operation example.
Note: 1. Acceleration and deceleration ramps selected by digital inputs have priority over the automatic switching by the speed level set to C1-
11. For example, if accel/decel ramp 2 is selected, the drive will use this time only and not switch from accel/decel ramp 4 to the
selected one.
2. The acceleration rate switch is disabled if the S3-21 (Dwell 2 End Speed) is set to any other value other than 0.
Figure 5.4
n
C1-11: Accel/Decel Switching Speed
Sets the speed at which the drive switches between accel/decel ramp settings.
a Speed Level on page 110.
No.
C1-11
Note: Setting C1-11 to 0.0% disables this function.
n
C1-09: Emergency Stop Ramp
Sets a special deceleration used when a select group of faults occur or when closing a digital input configured as H1-
= 15 (N.O. input) or 17 (N.C. input). A momentary closure of the digital input will trigger the Emergency Stop operation;
it does not have to be closed continuously. The drive cannot be restarted after initiating an Emergency Stop operation
until after completing deceleration, clearing the Emergency Stop input, and cycling the Up/Down command.
An Emergency Stop can be selected as the action the drive should take when certain faults occur, such as L8-03
(Overheat Pre-Alarm Operation Selection).
No.
C1-09
<1> The setting range and default value depend on the display units set in parameter o1-03. If o1-03 is set between 0 and 4, the time required to go
from 0% speed to 100% maximum speed is expressed in seconds. If o1-03 is set to 5 or 6, then setting units will appear in m/s
drive is in V/f control mode, the Emergency stop ramp can be set in seconds only.
NOTICE: Rapid deceleration can trigger an overvoltage fault. The drive output shuts off when faulted and the motor coasts. Set an
appropriate Emergency Stop time to C1-09 to avoid this uncontrolled motor state and to ensure that the motor stops quickly and safely.
n
C1-10: Accel/Decel Setting Resolution
Determines the units for the acceleration and deceleration ramps set to C1-01 through C1-09 using parameter C1-10.
No.
C1-10
Setting 0: Two decimal places
Setting 1: One decimal place
n
C1-15: Inspection Deceleration Ramp
Sets the deceleration ramp during Inspection Run. Refer to
No.
C1-15
110
Output Speed
C1-11
Accel/Decel
Switching Speed
C1-07 C1-01
setting setting
When the output speed ≥ C1-11, drive uses Accel/Decel Ramp 1 (C1-01, -02)
When the output speed < C1-11, drive uses Accel/Decel Ramp 2 (C1-07, -08)
Figure 5.4 Accel/Decel Switching Speed
Parameter Name
Accel/Decel Switching Speed
Parameter Name
Emergency Stop Ramp
Parameter Name
Accel/Decel Setting Resolution
Parameter Name
Inspection Deceleration Ramp
YASKAWA EUROPE SIEP
C1-02 C1-08
setting setting
Refer to Switching Accel/Decel Ramps by
0.0 to 600.0 s
Inspection Operation on page 89
0.00 to 2.00 s
common_TMo
Setting Range
0.0 to 100.0%
Setting Range
<1>
2
or ft/s
Setting Range
0 or 1
for details.
Setting Range
<1>
YASKAWA AC Drive L1000V Technical Manual
Default
0.0%
Default
1.50 s
<1>
2
. If the
Default
0
Default
0.00 s
<1>