8-2
8.2
Acceleration and Deceleration Time (00-14, 00-15)
Acceleration and Deceleration times directly control the system dynamic response. In general, the longer the
acceleration and deceleration time, the slower the system response, and the shorter time, the faster the response.
An excessive amount of time can result in sluggish system performance while too short of a time may result in
system instability.
The default values suggested normally result in good system performance for the majority of general purpose
applications. If the values need to be adjusted, caution should be exercised, and the changes should be in small
increments to avoid system instability.
00-14 Acceleration time 1
00-15 Deceleration time 1
These parameters set the acceleration and deceleration times of the output frequency from 0 to maximum
frequency and from maximum frequency to 0.
To set parameter 00-14 or 00-15:
- After power-up press the
DSP/FUN
key
- Select
00 Basic Fun
- Press
READ/ ENTER
key
- Select parameter -14 or -15
with the
UP/DOWN
▲ and ▼ keys and press the
READ/ ENTER
key.
Acceleration and deceleration times are represented by the three most significant (high order) digits. Set
acceleration and deceleration times with respect to maximum frequency. The relationship between the set
frequency value and acceleration/deceleration times is as follows:
O
u
tp
u
t
fr
e
q
u
e
n
c
y
Acceleration time
Set frequency
Time
Deceleration time
Maximum frequency
O
u
tp
u
t
fr
e
q
u
e
n
c
y
Acceleration time
Set frequency
Time
Deceleration time
Maximum frequency
RUN
STOP
RUN
STOP
Set Frequency = Maximum Frequency Set Frequency < Maximum Frequency
Note:
If the set acceleration and deceleration times are set too low, the torque limiting function or stall prevention
function can become activated if the load torque and or inertia are relatively high. This will prolong the
acceleration and or deceleration times and not allow the set times to be followed. In this case the acceleration and
or the deceleration times should be adjusted.
