Mitsubishi Electric FR-F820-00046, Инструкция по эксплуатации

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Parameters (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
FR-F800 5 - 109
S-pattern acceleration/deceleration B (Pr. 29 = "2")
This is useful for preventing collapsing stacks such as on a conveyor. S-pattern acceleration/deceler-
ation B can reduce the impact during acceleration/deceleration by accelerating/decelerating while
maintaining an S-pattern from the present frequency (f2) to the target frequency (f1).
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.
Fig. 5-22:
Characteristic for parameter 29 = 2
I002558E_B
Fig. 5-23:
Anti-backlash measure function
I002559E_B
NOTE Setting the backlash measures increases the acceleration/deceleration time by the stopping time.
f1
f2
[S-pattern acceleration/
deceleration B]
Output fr
equenc
y
(Hz)
S
et f
req
uenc
y
(Hz)
Time
[Anti-backlash measure
function]
Pr. 141
Pr. 140
Pr. 143
Output f
req
uenc
y [H
z]
Pr. 13
Time
Pr. 142