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:
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.
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