Mitsubishi Electric FR-F740-00023 Instruction Manual page 103

Setting of acceleration/deceleration time
and acceleration/deceleration pattern
Setting value "6"
[Variable-torque
acceleration/deceleration]
Setting
frequency
Pr.3
Base frequency
Pr.8 Deceleration time
Pr.7 Acceleration time
CAUTION
Setting the backlash measures increases the acceleration/deceleration time by the stopping time.
Parameters referred to
Pr. 3 Base frequency Refer to page 78
Pr. 7 Acceleration time, Pr. 8 Deceleration time, Pr. 20 Acceleration/deceleration reference frequency
Pr. 14 Load pattern selection
Pr. 592 Traverse function selection
94
(5) Variable-torque acceleration/deceleration (Pr.29 = "6")
This function is useful for variable-torque load such as a fan and blower to
accelerate/decelerate in short time.
In areas where output frequency > base frequency, the speed accelerates/
decelerates linearly.
CAUTION
As the acceleration/deceleration time of variable-torque acceleration/deceleration,
set the time taken to reach Pr. 3 Base frequency, not Pr. 20 Acceleration/deceleration
Time
reference frequency.
REMARKS
When the base frequency is not 45 to 65Hz, the speed accelerates/decelerates
linearly even though Pr. 29 = "6".
Variable-torque acceleration/deceleration is disabled when traverse function is
enabled (Pr.592 = "2" or Pr.592 = "1" at External operation mode).
Variable-torque acceleration/deceleration overrides Pr. 14 = "1" setting (for variable-
torque load). Thus, when Pr. 14 = "1" while variable-torque acceleration/deceleration is
valid, inverter operates as Pr. 14 = "0" (for constant-torque load).
Refer to page 80
Refer to page 246
Refer to page 90