Mitsubishi Electric FR-A720-0.4K Instruction Manual page 184

Pr.20
(60Hz)
Acceleration Pr.7 Deceleration
time time
Pr.44
Pr.110
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 value) and Pr.13=0.5Hz.
(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
time setting
frequency - Pr. 10
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) 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)
" "
CAUTION
⋅ Changing the Pr. 21 setting changes the acceleration/deceleration time setting (Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45, Pr. 110, Pr. 111, Pr.
264, Pr. 265).
(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.
(4) Set multiple acceleration/deceleration time (RT signal, X9 signal, Pr. 44, Pr. 45, Pr. 110, Pr. 111,
Pr. 147)
⋅ Pr. 44 and Pr. 45 are valid when the RT signal is ON, or the output frequency reaches or exceeds the setting of Pr.
147. Pr. 110 and Pr. 111 are valid when the X9 signal is ON. When the RT signal (X9 signal) turns ON, the
acceleration/deceleration time switches to the second (third) acceleration/deceleration time even when the output
frequency has not reached the Pr. 147 setting. Priority of switching is X9 signal > RT signal > Pr. 147 setting.
⋅ For the terminal used for X9 signal input, set "9" in any of Pr. 178 to Pr. 189 (input terminal function selection) to assign
the function.
⋅ When "9999" is set in Pr. 45 or Pr. 111, the deceleration time becomes equal to the acceleration time (Pr. 44, Pr. 110).
⋅ When Pr. 110 = "9999", third acceleration/deceleration time is invalid.
⋅ If the Pr. 147 setting is lower than Pr. 10 DC injection brake operation frequency or Pr. 13 Starting frequency setting, the
acceleration/deceleration time switches to the Pr. 44 (Pr. 45) setting when the output frequency exceeds the Pr. 10 or
Pr. 13 setting.
Pr. 147 Setting
9999 (initial value)
0.00Hz
0.01Hz ≤ Pr. 147 ≤ Set frequency
Set frequency < Pr. 147
(1) Acceleration time setting (Pr. 7, Pr. 20)
⋅ Use Pr. 7 Acceleration time to set the acceleration time required to reach Pr.
Running
20 Acceleration/deceleration reference frequency from 0Hz.
frequency
⋅ Set the acceleration time according to the following formula.
Acceleration
Time
time setting
Pr.8
Pr.45
Pr.111
Pr. 20
Deceleration time from maximum
×
operating frequency to stop.
Acceleration/Deceleration Time
Pr. 7, Pr. 8
Pr. 44, Pr. 45
Output frequency < Pr. 147: Pr. 7, Pr. 8
Pr. 147 ≤ Output frequency: Pr. 44, Pr. 45
Pr. 7, Pr. 8
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
Pr. 20
×
=
Maximum operating
frequency - Pr. 13
Pr. 7 =
Pr. 8 =
No automatic switching of the acceleration/
deceleration time
Second acceleration/deceleration time from a start
Acceleration/deceleration time automatic switching
No automatic switching, since output frequency will
not reach the switching frequency
Acceleration time from stop to
maximum operating frequency
60Hz
× 10s
12.1s
50Hz - 0.5Hz
120Hz
× 10s
25.5s
50Hz - 3Hz
Description
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