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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
Param-
eter
Number
Stall pre-
vention
selection
during accel
L3-01
StallP Accel
Sel
Stall pre-
vention
level during
accel
L3-02
StallP Accel
Lvl
Stall pre-
vention
limit during
accel
L3-03
StallP CHP
Lvl
* C6-01=1: 120%, C6-01=0: 150%
-28
6
Name
Description
Display
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.)
Effective when L3-01 is set
to 1 or 2.
Set as a percentage of
Inverter rated current.
Usually setting is not neces-
sary. The factory setting
reduces the set values when
the motor stalls.
Sets the lower limit for stall
prevention during accelera-
tion, as a percentage of the
Inverter rated current, when
operation is in the frequency
range above E1-06.
Usually setting is not neces-
sary.
Control Methods
Change
Setting
Factory
during
Range
Setting
Opera-
V/f
tion
0 to 2
1
No
A
0 to
150%
No
A
200
*
0 to
50%
No
A
100
Regis-
V/f
Open
Flux
ter
with
Loop
Vec-
PG
Vector
tor
A
A
No
48FH
A
A
No
490H
A
A
No
491H
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Table of Contents
Troubleshooting
