Shortest Acceleration/Deceleration And Optimum Acceleration/Deceleration (Automatic Acceleration/Deceleration) - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

5.8.6 Shortest acceleration/deceleration and optimum
acceleration/deceleration (automatic acceleration/
deceleration)
V/F V/F V/F Magnetic flux Sensorless Sensorless Sensorless Vector
Magnetic flux Magnetic flux
The inverter can be operated with the same conditions as when the appropriate value is set to each parameter even when
acceleration/deceleration time and V/F pattern are not set. This function is useful for operating the inverter without setting
detailed parameters.
Pr. Name
292 Automatic acceleration/
F500 deceleration
61
Reference current
F510
62 Reference value at
F511 acceleration
63 Reference value at
F512 deceleration
293 Acceleration/deceleration
F513 separate selection
*1 The setting range of FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower
*2 The setting range of FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher
 Shortest acceleration/deceleration (Pr.292 = "1, 11", Pr.293)
• Set this parameter to accelerate/decelerate the motor at the shortest time. This function is useful when the motor needs
to be accelerated/decelerated at a shorter time, such as for a machine, but the designed value of the machine constant is
not known.
• At acceleration/deceleration, this function adjusts the motor to accelerate/decelerate with the maximum inverter output
torque using the Pr.7 Acceleration time and Pr.8 Deceleration time setting as reference. (Pr.7 and Pr.8 settings are not
changed.)
• Use Pr.293 Acceleration/deceleration separate selection to apply the shortest acceleration/deceleration to one of
acceleration and deceleration only.
When "0 (initial value)" is set, the shortest acceleration/deceleration is performed for both acceleration and deceleration.
• Since the FR-A820-00490(7.5K) or lower, FR-A840-00250(7.5K) or lower capacity inverters are equipped with built-in
brake resistors, set Pr.292 to "11". Set "11" also when a high-duty brake resistor or brake unit is connected. The
deceleration time can further be shortened.
Vector Vector
Initial
Setting range
value
0
1
11
0
3
5, 6
7, 8
0 to 500 A
9999
0 to 3600 A
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
0
0 1
2
5.8 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Normal operation
Shortest acceleration/deceleration (without brakes)
Shortest acceleration/deceleration (with brakes)
Optimum acceleration/deceleration
Lift operation 1, 2 (Refer to
Brake sequence mode 1, 2
(Refer to page 541.)
*1
Set the reference current during shortest (optimum)
acceleration/deceleration.
*2
Rated output current value reference of the inverter
Set the speed limit value (optimum value) during shortest
(optimum) acceleration.
Shortest acceleration/deceleration: 150% as the limit value
Optimum acceleration/deceleration: 100% as the optimum
value
Set the speed limit value (optimum value) during shortest
(optimum) deceleration.
Shortest acceleration/deceleration: 150% as the limit value
Optimum acceleration/deceleration: 100% as the optimum
value
Shortest (optimum) acceleration/deceleration for both
acceleration and deceleration
Shortest (optimum) acceleration/deceleration for
acceleration only
Shortest (optimum) acceleration/deceleration for
deceleration only
Description
page 368.)
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
365