Mitsubishi Electric FR-A820-00046 Instruction Manual page 426

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Variable-torque acceleration/deceleration (Pr. 290 = "6")
This function is suitable to accelerate/decelerate a variable torque load such as a fan and blower in a
short time.
Linear acceleration/deceleration is performed in the area where the output frequency > base fre-
quency.
Fig. 5-98:
NOTES When the base frequency is out of the range 45 to 65 Hz, the linear acceleration/deceleration is
performed even if Pr. 29 = "6".
Even if Pr. 14 "Load pattern selection" = "1 (variable torque load)", variable torque acceleration/
deceleration setting is prioritized and the inverter operates as Pr. 14 = "0 (constant torque load)".
For the variable torque acceleration/deceleration time setting, set the time period to reach Pr. 3
"Base frequency". (Not the time period to reach Pr. 20 "Acceleration/deceleration reference fre-
quency".)
The variable torque acceleration/deceleration is disabled during PM sensorless vector control.
(Linear acceleration/deceleration is performed.)
Parameters referred to
Pr. 3
Pr. 7
Pr. 8
Pr. 20
Pr. 10
Pr. 178 to Pr. 182
5 - 246
Output frequency
Set frequency
Pr. 3 Base frequency
Acceleration time
Characteristic for parameter 29 = 6
Base frequency
Acceleration time
Deceleration time
Acceleration/deceleration reference frequency
DC injection brake operation frequency
(input terminal function selection)
[Variable-torque acceleration/deceleration]
Pr. 7
Deceleration time
Parameters
Time
Pr. 8
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