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Setting of acceleration/deceleration time
and acceleration/deceleration pattern
(5) Setting the acceleration/deceleration time in the low-speed range
(Pr.791, Pr.792)
If torque is required in the low-speed range (rated motor frequency (Refer to page 81)/10), set the Pr.791 Acceleration
time in low-speed range and Pr.792 Deceleration time in low-speed range settings higher than the Pr.7 Acceleration time
and Pr.8 Deceleration time settings so that the slow acceleration/deceleration is performed in the low-speed range.
REMARKS
⋅ The RT signal acts as the second function selection signal and makes the other second function valid. (Refer to page 137)
⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal
function selection), you can assign the RT signal to the other terminal.
⋅ 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.
⋅ Set Pr.791 higher than Pr.7, and Pr.792 higher than Pr.8. If set as Pr.791 < Pr.7, the operation is performed as Pr.791 = Pr.7. If
set as Pr.792 < Pr.8, the operation is performed as Pr.792 = Pr.8.
⋅ 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.
♦ Parameters referred to ♦
Pr. 3 Base frequency Refer to page 98
Pr. 10 DC injection brake operation frequency Refer to page 123
Pr. 29 Acceleration/deceleration pattern selection Refer to page 115
Pr. 125, Pr. 126 (Frequency setting gain frequency) Refer to page 193
Pr. 178 to Pr.189 (Input terminal function selection) Refer to page 133
Pr. 999 Automatic parameter setting Refer to page 290
IPM
IPM
IPM
Low-speed range
(rated motor frequency/10)
Acceleration time
Slope set by Pr.7
Deceleration time
Slope set by Pr.8
Deceleration time
in low-speed range
Slope set by Pr.792
A
cceleration time
in low-speed range
Slope set by Pr. 791
Time
Output
frequency
(Hz)