5.3 C: Tuning
Switching Acceleration and Deceleration Times by Motor Selection
When switching between motor 1 and 2 using a digital input (H 1-DD = 16), parameters C1-01 to C1-04 become accel/
decel times 1 and 2 for motor 1, while C1-05 to C1-08 become accel/decel times 1 and 2 for motor 2. Accel/decel times
1 and 2 can be switched for each motor using a digital inputs set to H 1-D D = 7 like shown in
Table 5.7
.
Note: 1. The m otor 2 selection function cannot be used when PM motor is used.
2. The digital input setting “A ccel/Decel time 2 selection” (H 1 -D D = 1A) cannot be used together with m otor 1/2 switching. Trying to
do so triggers an oPE03 error, indicating a contradictory m ultifunction input settings.
3. The acceleration rate switch is disabled if the S3-21 “Dwell 2 End Speed” is set to any other value other than 0.
Table 5.7 Motor Switching and Accel/Decel Time Combinations
Accel/Decel Time 1 (И 1-П П = 7)
Motor 1 Selected (Terminal set to И1-П П =16 OFF)
Motor 2 Selected (Terminal set to И 1-П П =16 ON)
Accel
Decel
Accel
Decel
Open
C1-01
C1-02
C1-05
C1-06
Closed
C1-03
C1-04
C 1-07
C1-08
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 5.6
shows an operation example.
Note: 1. A cceleration and deceleration ramps selected by digital inputs have priority over the autom atic 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 i f the S3-21 (Dwell 2 End Speed) is set to any other value other than 0.
O u tp u t S p e e d
C 1 - 0 7
C 1 -0 1
C 1 - 0 2
C 1 -0 8
s e ttin g
s e ttin g
s e ttin g
s e ttin g
W h e n th e o u tp u t sp e e d > C 1-11, d riv e u s e s A c c e l/D e c e l R a m p 1 (C 1 -0 1 , -02)
W h e n th e o u tp u t sp e e d < C 1-11, d riv e u s e s A c c e l/D e c e l R a m p 2 (C 1 -0 7 , -0 8 )
F ig u r e 5.6 A c c e l/D e c e l S w itc h in g S p e e d
■ C1-11: Accel/Decel Switching Speed
Sets the speed at which the drive switches between accel/decel ramp settings.
Refer to Switching Accel/DecelRamps by
a Speed Level on page 145.
No.
Parameter Name
Setting Range
Default
C1-11
A ccel/D ecel Switching Speed
0.0 to 100.0%
0.0%
Note: Setting C1-11 to 0.0% disables this function.
■ 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 H 1-DD
= 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.
Parameter Name
Setting Range
Default
C1-09
Emergency Stop Ramp
0.0 to 600.0 s <1>
1.50 s <1>
<1> The setting range and default value depend on the display units set in param eter o1-03. I f o1-03 is set between 0 and 4, the time required to go
from 0% speed to 100% m aximum speed is expressed in seconds. I f o1-03 is set to 5 or 6, then setting units will appear in m/s2 or ft/s2. I f the
drive is in V /f control mode, the Emergency stop ramp can be set in seconds only.
N O TIC E:
R a p id d e c e le ra tio n can trig g e r a n o v e rv o lta g e fault. The d riv e o u tp u t shu ts o ff w h en fa u lte d a n d the m o to r coasts. S et an
a p p ro p ria te E m e rg e n c y Stop tim e to C 1 -0 9 to a v o id this u n c o n tro lle d m o to r state a n d to e n sure th a t the m o to r stop s q u ic k ly a n d safely.
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
145
P
a
ra
m
e
te
r
D
e
ta
il
s