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Setting of acceleration/deceleration time and acceleration/ deceleration pattern
(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.
Deceleration
=
Maximum operating frequency - Pr. 10
time setting
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.
(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.
NOTE
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
page 86).
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
4
t=
9
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
terminal.
114
Pr. 20
T
5
2
f
T
+
2
9
(Pr. 3)
Frequency setting (Hz)
Acceleration/
deceleration time (s)
5
15
Deceleration time from maximum operating frequency to stop
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
60
5
15
120Hz
10s
Pr. 8 =
50Hz-3Hz
120
200
400
12
27
102
35
82
305
25.5s
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