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Mitsubishi Electric FR-F700PJ Instruction Manual Page 120

Air-conditioning inverter.
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Setting of acceleration/deceleration time and acceleration/ deceleration pattern
(4) 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/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
(When the second function is enabled, the setting is applied.) settings so that the slow acceleration/deceleration is
performed in the low-speed range.
(Refer to page 85 for the rated motor frequency.)
Acceleration time
in low-speed range
Slope set by Pr. 791
 The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 137)
 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.
 Any value can be set to the acceleration/deceleration time, but 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
Pr. 10 DC injection brake operation frequency
Pr. 29 Acceleration/deceleration pattern selection
Pr. 125, Pr. 126 (frequency setting gain frequency)
Pr. 178 to Pr. 182 (input terminal function selection)
Acceleration time
Slope set by Pr.7
Refer to page 103
Refer to page 129
Refer to page 118
Refer to page 188
Refer to page 134
Low-speed range
(rated motor frequency/10)
Deceleration time
in low-speed range
Deceleration time
Slope set by Pr.792
Slope set by Pr.8


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