Shortest Acceleration/Deceleration (Automatic Acceleration/Deceleration) - Mitsubishi Electric FR-E800 Instruction Manual

9.6
Shortest acceleration/deceleration (automatic
acceleration/deceleration)
V/F V/F V/F Magnetic flux Magnetic flux Sensorless Magnetic flux Sensorless Sensorless Vector
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.
292
Automatic acceleration/
F500
deceleration
A110
61
Reference current
F510
62 Reference value at
F511 acceleration
63 Reference value at
F512 deceleration
293 Acceleration/deceleration
F513 separate selection
 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.
• Set "11" in Pr.292 when a brake resistor or brake unit is connected. The deceleration time can further be shortened.
• When the shortest acceleration/deceleration is selected under V/F control and Advanced magnetic flux vector control, the
stall prevention operation level during acceleration/deceleration becomes 150% (adjustable using Pr.61 to Pr.63). The
setting of Pr.22 Stall prevention operation level and stall level by analog input are used only during a constant speed
operation.
Under Real sensorless vector control and Vector control, the torque limit level (Pr.22, etc.) is applied during acceleration/
deceleration. The adjustments by Pr.61 to Pr.63 are disabled.
• It is inappropriate to use for the following applications.
- Machines with large inertia (10 times or more), such as a fan. Since stall prevention operation is activated for a long
time, this type of machine may be shut off due to motor overloading, etc.
- When the inverter is always operated at a specified acceleration/deceleration time.
276
9. (F) Settings for Acceleration/Deceleration

9.6 Shortest acceleration/deceleration (automatic acceleration/deceleration)

Vector Vector
Initial
Name
value
0
9999
9999
9999
0
Setting range
0 Normal operation
1 Shortest acceleration/deceleration (without brakes)
11 Shortest acceleration/deceleration (with brakes)
7, 8 Brake sequence 1, 2 (Refer to
Set the reference current during shortest acceleration/
0 to 500 A
deceleration.
9999 Rated output current value reference of the inverter
0% to 400% Set the speed limit value during shortest acceleration.
9999 The limit value is 150% (120% for the LD rating).
0% to 400% Set the speed limit value during shortest deceleration.
9999 The limit value is 150% (120% for the LD rating).
Shortest acceleration/deceleration for both acceleration
0
and deceleration
1 Shortest acceleration/deceleration for acceleration only
2 Shortest acceleration/deceleration for deceleration only
Description
page 456.)