Mitsubishi Electric FR-F800 Series Instruction Manual page 231

NOTE
• If the acceleration/deceleration time is set, 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.
• 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.
• Under PM motor control, if the protective function (E.OLT) is activated due to insufficient torque in the low-speed range, set
longer acceleration/deceleration times only in the low-speed range in Pr.791 Acceleration time in low-speed range and
Pr.792 Deceleration time in low-speed range.
 Changing the minimum increment of the acceleration/deceleration time
(Pr.21)
• Use Pr.21 to set the minimum increment of the acceleration/deceleration time.
Setting value "0 (initial value)": minimum increment 0.1 second
Setting value "1": minimum increment 0.01 second
• Pr.21 setting allows the minimum increment of the following parameters to be changed.
Pr.7, Pr.8, Pr.16, Pr.44, Pr.45, Pr.111, Pr.264, Pr.265, Pr.582, Pr.583, Pr.791, Pr.792, Pr.1477, Pr.1478
NOTE
• Pr.21 setting does not affect the minimum increment setting of Pr.611 Acceleration time at a restart.
• The FR-DU08 and the FR-PU07 provide a five-digit readout (including the number of decimal places) on a value of parameters.
Therefore, a value of "1000" or larger is set/displayed only in increments of 0.1 second even if Pr.21 = "1".
 Setting multiple acceleration/deceleration times (RT signal, Pr.44, Pr.45,
Pr.147)
• Pr.44 and Pr.45 are applied when the RT signal is ON or when the output frequency is equal to or higher than the frequency
set in Pr.147 Acceleration/deceleration time switching frequency.
• Even at the frequency lower than the Pr.147 setting, turning ON the RT signal switches the acceleration/deceleration time
to the second acceleration/deceleration time. The priority of the signals and settings is as follows: RT signal > Pr.147
setting.
• When "9999" is set in Pr.45, the deceleration time becomes equal to the acceleration time (time set in Pr.44).
• While the Pr.147 setting is equal to or less than the setting of Pr.10 DC injection brake operation frequency or Pr.13
Starting frequency, the time used as the acceleration/deceleration time switches to the time set in Pr.44 (Pr.45) when the
output frequency reaches or exceeds the Pr.10 or Pr.13 setting.
Pr.147 setting
9999 (initial value)
0.00 Hz
0.01 Hz ≤ Pr.147 setting ≤ Set frequency
Set frequency < Pr.147 setting
Output frequency
(Hz)
Set
frequency
Pr. 7 Pr. 44
RT signal
230
5. PARAMETERS
5.5 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
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Setting applied to the acceleration/deceleration
Pr.7, Pr.8
Pr.44, Pr.45
Output frequency < Pr.147 setting: Pr.7, Pr.8
Pr.147 setting ≤ Output frequency: Pr.44, Pr.45
Pr.7, Pr.8
Pr. 44 Pr. 8
(Pr. 45)
ON
search engine
time
Acceleration/deceleration time is not
automatically changed.
Second acceleration/deceleration time is
applied from the start.
Acceleration/deceleration time is
automatically changed.
Not changed as the frequency has not
reached the switchover frequency.
Time
Description