6-18
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 applied
to the motor, or sudden rapid acceleration is performed.
If you set L3-01 to 1 (enabled) and the Inverter output current reaches 85 % of the set value in L3-02, the
acceleration rate will begin to slow down. When L3-02 is exceeded, the acceleration will stop.
If you set L3-01 to 2 (optimum adjustment), the motor accelerates so that the current is held at a level of 50 %
of the inverter rated current. With this setting, the acceleration time setting is ignored.
Related Parameters
Time Chart
The following figure shows the frequency characteristics when L3-01 is set to 1.
Fig 6.18 Time Chart for Stall Prevention During Acceleration
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L3-01
Stall prevention selection during
acceleration
0: Disabled (Accelerates according to the setting. Motor
may stall if the load is too high.)
1: Enabled (Acceleration stops when the level set in
L3-02 is exceeded. Acceleration continues when
current value falls below the level set in L3-02.)
2: Optimum adjustment (Adjusts acceleration using the
current level set in L3-02 as reference. The
acceleration time setting is ignored.)
0 to 2 1 No A
L3-02
Stall prevention level during
acceleration
Set as a percentage taking the Inverter rated current to be
100%.
Normally, it is not necessary to change this setting. Lower
the set value if the motor stalls using the factory setting.
0 to 200 120% No A
Output current
Stall level during
acceleration
Time
Time
Output frequency
* 1. The acceleration rate is lowered.
* 2. The acceleration is stopped to reduce the output current.
*1.
*2.
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