Yaskawa Matrix Converter - Manual (Page 186)

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 and also during sudden rapid acceleration.
If L3-01 is set to 1 (enabled) and the MxC output current exceeds the -15% level of L3-02, then the accelera-
tion rate will begin to slow down. Acceleration will stop if the output current rises above L3-02.
When L3-01 is set to 2, then the motor will accelerate to the value set in L3-02 as the MxC automatically
adjusts the rate of acceleration to prevent stalling. Here, the acceleration time setting is disregarded.
„ Related Parameters
* Not available for the MxC models CIMR-ACA4110 and 4160 for V/f Control.
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
L3-01 *
Stall Prevention
Selection During
Accel 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 out-
put 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.
0 to 2 1 No A A No
StallP Accel Sel
L3-02
Stall Prevention
Level During
Acceleration This function is enabled when L3-01 is “1” or
“2”.
MxC rated current is 100%. Decrease the set
value if stalling or excessive current occurs
with default.
0 to 200 150% No A A No
StallP Accel Lvl
L3-03
Stall Prevention
Limit During
Acceleration Sets the lower limit for stall prevention during
acceleration as a percentage of the rated cur-
rent of the MxC when operation is in the fre-
quency range above E1-06 (constant power
region).
0 to 100 50% No A A No
StallP CHP Lvl