Preventing The Motor From Stalling During Acceleration (Stall Prevention During Acceleration Function) - YASKAWA G7 Series Technical Manual

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 Drive 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
Parameter
Number
Stall
Prevention
Selection
During Accel
L3-01
StallP Accel
Sel
Stall
Prevention
Level During
L3-02
Acceleration
StallP Accel
Lvl
Stall
Prevention
Limit During
L3-03
Acceleration
StallP CHP
Lvl
-20
6
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Name
Description
Display
Selects the stall prevention method
used to prevent excessive current
during acceleration.
0: Disabled - Motor accelerates at
active acceleration rate. The
motor may stall if load is too
heavy or accel time is too short.
1: General Purpose - When output
current exceeds L3-02 level,
acceleration stops. Acceleration
will continue when the output
current level falls below the
L3-02 level.
2: Intelligent - The active
acceleration rate is ignored.
Acceleration is completed in the
shortest amount of time without
exceeding the current value set
in L3-02.
This function is enabled when
L3-01 is "1" or "2".
Drive rated current is 100%.
Decrease the set value if stalling or
excessive current occurs with
factory setting.
Sets the lower limit for stall
prevention during acceleration, as a
percentage of the Drive's rated
current, when operation is in the
frequency range above E1-06
(constant power region).
Change
Setting Factory
during
Range Setting
V/f
Operation
0 to 2 1 No A
0 to 200 150% No A
0 to 100 50% No A
Control Methods
Open Open
V/f
Loop Flux Loop
with
Vector Vector Vector
PG
1 2
A A No No
A A No No
A A No No