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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.
* 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."
(3) Change the setting range and increments of the acceleration/deceleration time (Pr.21)
⋅ Use Pr. 21 to set the acceleration/deceleration time and minimum setting range.
Setting
"0" (initial value)......................0 to 3600s (minimum setting increments 0.1s)
Setting
"1" ...........................................0 to 360s (minimum setting increments 0.01s)
(1) Acceleration time setting (Pr.7, Pr.20)
⋅ Use Pr. 7 Acceleration time to set the acceleration time required to reach
Pr. 20 Acceleration/deceleration reference frequency from 0Hz.
⋅ Set the acceleration time according to the following formula.
* The output starts at 0Hz under IPM motor control. Calculate with 0Hz.
Example) How to find the setting value for Pr.7 when increasing the output
frequency to the maximum frequency of 50Hz in 10s with Pr.20 =
60Hz (initial setting) and Pr.13 = 0.5Hz.
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.
CAUTION
⋅ Changing the Pr. 21 setting changes the acceleration/deceleration time setting (Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45, Pr. 791, Pr.
792). (The Pr. 611 Acceleration time at a restart setting is not affected.)
<Example>
When Pr. 21 = "0", setting "5.0" s in Pr. 7 and "1" in Pr. 21 automatically changes the Pr. 7 setting to "0.5" s.
Acceleration
time setting
=
Pr.20
×
Acceleration time from stop to
maximum operating frequency
Maximum operating
frequency - Pr. 13*
Running
frequency
Acceleration
time
Deceleration
time
Time
Pr.20
Pr.7
Pr.8
Output
frequency
(Hz)
(60Hz)
Pr.7 =
60Hz
×
10s 12.1s
50Hz - 0.5Hz
Deceleration
time setting
=
Pr.20
×
Deceleration time from maximum
operating frequency to stop.
Maximum operating
frequency - Pr. 10*
Pr.8 =
120Hz
×
10s 25.5s
50Hz - 3Hz