Acceleration and Deceleration Characteristics
6-13
Preventing the Motor from Stalling During Acceleration (Stall Prevention
During Acceleration Function)
The Stall Prevention During Acceleration function prevents the motor from stalling if a heavy load is placed
on the motor, or sudden rapid acceleration is performed.
If you set L3-01 to 1 (enabled) and the Inverter output current exceeds the -15% level of the set value in L3-
02, the acceleration rate will begin to slow down. When L3-02 is exceeded, acceleration will stop.
If you set L3-01 to 2 (optimum adjustment), the motor current accelerates to the value set in L3-02. With this
setting, the acceleration time setting is ignored.
Related Parameters
* The factory setting will change when the control method is changed.
Constant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Operation
Control
Methods
MEMOBUS
Register
Open-
loop
Vector
Flux
Vector
Display
L3-01
Stall prevention
selection during accel
0: Disabled (Acceleration as
set. With a heavy load, the
motor may stall.)
1: Enabled (Acceleration
stopped when L3-02 level is
exceeded. Acceleration
starts again when the
current is returned.)
2: Intelligent acceleration
mode (Using the L3-02
level as a basis, acceleration
is automatically adjusted.
Set acceleration time is
disregarded.)
0 to 2 0 No A No 520H
StallP Accel Sel
L3-02
Stall prevention level
during accel
Effective when L3-01 is set to 1
or 2.
Set as a percentage of Inverter
rated current.
Usually setting is not necessary.
The factory setting reduces the
set values when the motor
stalls.
0 to
200
150% No A No 521H
StallP Accel Lvl
L3-03
Stall prevention limit
during accel
Sets the lower limit for stall
prevention during acceleration,
as a percentage of the Inverter
rated current, when operation is
in the frequency range above
E1-06.
Usually setting is not necessary.
0 to
100
100%
*
No A No 522H
StallP CHP Lvl
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