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Setting of acceleration/deceleration time and acceleration/ deceleration pattern
4
PARAMETERS
(2) 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
frequency.
Set the deceleration time according to the following formula.
(3) 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.
Deceleration
time setting
=
Pr. 20
× Deceleration time from maximum operating frequency to stop
Maximum operating frequency - Pr. 10
Example)When the frequency can be decelerated down to the maximum
operating frequency of 50Hz in 10s with 120Hz set in Pr. 20 and 3Hz set
in Pr. 10
Pr. 8 =
120Hz
×
10s 25.5s
50Hz-3Hz
NOTE
When the acceleration/deceleration pattern is S-pattern acceleration/deceleration A (refer to page 99), the acceleration/
deceleration time is the time required to reach Pr. 3 Base frequency.
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
Changing terminal assignment may affect the other functions. Make setting after confirming the function of each
terminal.
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 116)
If the Pr. 20 setting is changed, the Pr. 125 and Pr. 126 (frequency setting signal gain frequency) settings do not change.
Set Pr. 125 and Pr. 126 to adjust the gains.
When the Pr. 7, Pr. 8, Pr. 44 and Pr. 45 settings are 0.03s or less, the acceleration/deceleration time is 0.04s. At that time, set Pr.
20 to "120Hz" or less.
Any value can be set to the acceleration/deceleration time, but the actual motor acceleration/deceleration time cannot be made
shorter than the shortest acceleration/deceleration time determined by the mechanical system J (moment of inertia) and motor torque.
Parameters referred to
Pr. 3 Base frequency Refer to page 85
Pr. 10 DC injection brake operation frequency Refer to page 109
Pr. 29 Acceleration/deceleration pattern selection Refer to page 99
Pr. 125, Pr. 126 (frequency setting gain frequency) Refer to page 153
Pr. 178 to Pr. 182 (input terminal function selection) Refer to page 113
Guideline for acceleration/deceleration time at the Pr. 3 Base frequency of 60Hz (0Hz to set frequency)
t=
4
×
T
× f
2
+
5
T
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
9
(Pr. 3)
2
9
Frequency setting (Hz)
60 120 200 400
Acceleration/
deceleration time (s)
5 5 12 27 102
15 15 35 82 305