Mitsubishi Electric FR-F740 EC Instruction Manual page 234

Acceleration and deceleration
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.
Setting
frequency
Base frequency
NOTES 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 reference
frequency".
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).
6 - 84
Variable-torque
acceleration/deceleration
Pr. 3
Pr. 7 Pr. 8
Acceleration time Deceleration time
Fig. 6-38:
Characteristic for parameter 29 = 6
Time
Parameter
I002093E