6-30
Machine Protection
Preventing Motor Stalling During Operation
Stall prevention during operation prevents the motor from stalling by automatically lowering the Inverter's
output frequency when a transient overload occurs while the motor is operating at a constant speed.
If the Inverter output current continues to exceed the setting in constant L3-06 for 100 ms or longer, the motor
speed is reduced. Set whether to enable or disable the stall prevention using constant L3-05. Set the according
deceleration times using C1-02 (Deceleration time 1) or C1-04 (Deceleration Time 2).
If the Inverter output current reaches the set value in L3-06 – 2%, the motor will accelerate again to the set fre-
quency.
Related Constants
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L3-05
Stall prevention selection during
running function selection
0: Disabled (Operates according to the setting. Motor
may stall when the load is too large.)
1: Enabled--Deceleration time 1 (Deceleration time set in
C1-02 is used.)
2: Enabled--Deceleration time 2 (Deceleration time set in
C1-04 is used.)
0 to 2 1 No A
L3-06
Stall prevention level during run-
ning
Enabled when L3-05 is set to 1 or 2. Set as a percentage,
taking Inverter rated current to be 100%.
Normally, there is no need to change this setting.
Lower the set value if the motor stalls at the factory set-
ting.
30 to 200 120% No A
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