Mitsubishi Electric 800 Series Instruction Manual (Function page 248

NOTE
• Even if automatic acceleration/deceleration has been selected, inputting the JOG signal (JOG operation) or RT signal (Second
function selection) during an inverter stop switches to the normal operation and give priority to JOG operation or second
function selection. Note that during operation, an input of JOG and RT signal does not have any influence even when the
automatic acceleration/deceleration is enabled.
• Since acceleration/deceleration is made with the stall prevention operation being activated, the acceleration/deceleration
speed always varies according to the load conditions.
• By setting Pr.7 and Pr.8 appropriately, it is possible to accelerate/decelerate with a shorter time than when selecting the
shortest acceleration/deceleration.
• The shortest acceleration/deceleration is enabled when the operation starts with the RT signal OFF while this function and the
stop-on-contact control are both enabled. (Stop-on-contact control is not enabled when the RT and RL signals are turned ON
during operation.)
• The shortest acceleration/deceleration is disabled when the operation starts after the RT signal is turned ON during a stop
while this function and the stop-on-contact control are both enabled. (Stop-on-contact control is enabled by turning ON the RL
signal.)
 Shortest and optimum acceleration/deceleration mode adjustment (Pr.61
to Pr.63)
• The application range can be expanded by setting the parameters for adjustment of Pr.61 to Pr.63.
Pr. Name
61 Reference current
Reference value
62 at acceleration
63 Reference value
at deceleration
NOTE
• When Real sensorless vector control or Vector control is selected with the shortest acceleration/deceleration, Pr.61 to Pr.63
are invalid.
• Even if Pr.61 to Pr.63 are set once, changing the setting to other than the shortest acceleration/deceleration (Pr.292 ≠ "1 or
11") automatically resets to the initial setting (9999). Set Pr.61 to Pr.63 after setting Pr.292.
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration
Pr.22 Stall prevention operation levelpage 295
Pr.22 Torque limit levelpage 122
Setting range
Set the rated motor current value such as when the motor capacity and inverter capacity
differ.
0 to 500 A
Set the reference current (A) of the stall prevention operation level during acceleration/
deceleration.
9999 (initial
The rated inverter current value is the reference.
value)
Used to change the reference level of acceleration and deceleration.
0% to 400% Set the stall prevention operation level (percentage of current value of Pr.61) during
acceleration/deceleration.
9999 (initial
Stall prevention operation level is 150% for the shortest acceleration/deceleration.
value)
timepage 232
10.6 Shortest acceleration/deceleration (automatic acceleration/deceleration)
Description
10. (F) Settings for Acceleration/Deceleration
1
2
3
4
5
6
7
8
9
10
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