Mitsubishi Electric FR-A820-00046 (0.4K), Инструкция по эксплуатации

Страница: 452 / 1218

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern Parameters
5 - 250
Backlash measures (Pr. 29 = "3", Pr. 140 to Pr. 143)
●
Reduction gears have an engagement gap and have a dead zone between forward rotation and
reverse rotation. This dead zone is called backlash, and this gap disables a mechanical system from
following motor rotation. More specifically, a motor shaft develops excessive torque when the
direction of rotation changes or when constant-speed operation shifts to deceleration, resulting
in a sudden motor current increase or regenerative status.
●
To avoid backlash, acceleration/deceleration is temporarily stopped. Set the acceleration/decel-
eration stopping frequency and time in Pr. 140 to Pr. 143.
S-pattern acceleration/deceleration C (Pr. 29 = "4", Pr. 380 to Pr. 383)
●
Switch the acceleration/deceleration curve by the S-pattern acceleration/deceleration C switcho-
ver (X20) signal.
●
To input the X20 signal, set "20" in any of Pr. 178 to Pr. 189 (Input terminal function selection) to
assign the function to the terminal.
Fig. 5-93:
Anti-backlash measure function
I002559E_B
NOTE Setting the backlash measures increases the acceleration/deceleration time by the stopping time.
X20 signal During acceleration During deceleration
OFF Pr. 380 "Acceleration S-pattern 1" Pr. 381 "Deceleration S-pattern 1"
ON Pr. 382 "Acceleration S-pattern 2" Pr. 383 "Deceleration S-pattern 2"
Tab. 5-98: Selection of acceleration/deceleration curve S-pattern 1 or S-pattern 2
I001551E
Fig. 5-94: Characteristic for parameter 29 = 4
[Anti-backlash measure
function]
Pr. 141
Pr. 140
Pr. 143
Output f
req
uenc
y [H
z]
Pr. 13
Time
Pr. 142
Output frequency
Time
Pr. 381
Pr. 383
Pr. 382
Pr. 380
Set frequency
Frequency
S-pattern
acceleration/
deceleration C
switchover X20)
OFF OFF ON