Setting of acceleration/deceleration time and acceleration/ deceleration pattern
Deceleration time setting (Pr. 8, Pr. 20)
Use Pr. 8 Deceleration time to set the deceleration time required to reach 0Hz from Pr. 20 Acceleration/deceleration reference
Set the deceleration time according to the following formula.
Maximum operating frequency - Pr. 10
DC injection brake is not applied until the frequency drops to 0Hz regardless of the Pr.10 setting under IPM motor control. Under IPM motor control, calculate
as Pr.10 ="0."
Example) How to find the setting value for Pr.8 when decreasing the output
frequency from the maximum frequency of 50Hz in 10s with
Pr.20=120Hz and Pr.10=3Hz.
Set two kinds of acceleration/deceleration times (RT signal, Pr. 44, Pr. 45 )
Pr. 44 and Pr. 45 are valid when the RT signal is ON.
When "9999" is set to Pr. 45, the deceleration time becomes equal to the acceleration time (Pr. 44).
For the RT signal, set "3" in any of Pr. 178 to Pr. 182 (input terminal function selection) to assign the function.
When the acceleration/deceleration pattern is S-pattern acceleration/deceleration A (refer to page 118), the acceleration/
deceleration time is the time required to reach Pr. 3 Base frequency. When the S-pattern acceleration/deceleration A is
set under IPM motor control, acceleration/deceleration time is the time to reach the rated motor frequency (Refer to
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
Guideline for acceleration/deceleration time at the Pr. 3 Base frequency of 60Hz (0Hz to set frequency)
Changing terminal assignment may affect the other functions. Set parameters after confirming the function of each
Frequency setting (Hz)
deceleration time (s)
Deceleration time from maximum operating frequency to stop
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
Pr. 8 =