Acceleration and Deceleration Characteristics
6-21
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
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
L3-01
Stall preven-
tion 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 1 No A A A No No
StallP Accel
Sel
L3-02
Stall preven-
tion level dur-
ing 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 val-
ues when the motor stalls.
0 to 200 150% No A A A No No
StallP Accel
Lvl
L3-03
Stall preven-
tion limit dur-
ing accel
Sets the lower limit for stall preven-
tion during acceleration, as a per-
centage of the Inverter rated current,
when operation is in the frequency
range above E1-06.
Usually setting is not necessary.
0 to 100 50% No A A A No No
StallP CHP
Lvl
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