Yaskawa Matrix Converter - Manual (Page 208)

Machine Protection
6-
43
‹ Stall Prevention during Run
Stall Prevention during Run prevents the motor from stalling by automatically lowering the MxC's output fre-
quency when a transient overload occurs while the motor is operating at a constant speed.
Stall Prevention during Run is enabled only during V/f Control. If the MxC output current continues to exceed
the setting in parameter L3-06 for 100 ms or longer, the motor speed is reduced. Set whether to enable or dis-
able deceleration time using parameter L3-05. Set the deceleration time using C1-02 (Deceleration Time 1) or
C1-04 (Deceleration Time 2).
If the MxC output current reaches the set value in L3-06 - 2% (MxC Rated Output Current), the motor will
accelerate again at the frequency set or the acceleration time set.
„ Related Parameters
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
L3-05
Stall Prevention
Selection During
Running Selects the stall prevention method to use to
prevent MxC faults during run.
0: Disabled.- MxC runs a set frequency. A
heavy load may cause the MxC to trip on
an OC or OL fault.
1: Decel Time 1 - In order to avoid stalling
during heavy loading, the MxC will decel-
erate at Decel time 1 (C1-02) if the output
current exceeds the level set by L3-06.
Once the current level drops below the
L3-06 level, the MxC will accelerate back
to its frequency reference at the active
acceleration rate.
2: Decel Time 2 - Same as setting 1 except
the MxC decelerates at Decel Time 2 (C1-
04).
When output frequency is 6 Hz or less,
Stall Prevention during Run is disabled
regardless of the setting in L3-05.
0 to 2 1 No A No No
StallP Run Sel
L3-06
Stall Prevention
Level During Run-
ning This parameter is enabled when L3-05 is set
to “1” or “2”. MxC rated current is set as
100%.
Decrease the set value if stalling or excessive
current occurs with the defaults.
30 to
200
160% No A No No
StallP Run Level