YASKAWA L1000V Technical Manual page 139

Figure 5.26
Setting 2: Intelligent Stall Prevention
The drive disregards the selected acceleration time and attempts to accelerate in the minimum time. The acceleration rate
is adjusted so the current does not exceed the value set to parameter L3-02.
n
L3-02: Stall Prevention Level during Acceleration
Sets the output current level at which the Stall Prevention during acceleration is activated.
No.
L3-02
<1> The upper limit and default value are determined by the carrier frequency reduction (L8-38).
• Lower L3-02 if stalling occurs when using a motor that is relatively small compared to the drive.
• Also set parameter L3-03 when operating the motor in the constant power range.
n
L3-03: Stall Prevention Limit during Acceleration
Sets the lower limit for stall prevention during acceleration, as a percentage of the drive's rated current, when operating
in the constant power region (output frequency above E1-06).
No.
L3-03
n
L3-05: Stall Prevention Selection during Run
Determines how Stall Prevention works during Run. Stall Prevention during run prevents the motor from stalling by
automatically reducing the speed when a transient overload occurs while the motor is running at constant speed.
No.
L3-05
Note: 1. This function is available in V/f control mode.
2. Stall Prevention during run is disabled when the output frequency is 6 Hz or lower regardless of the L3-05 and L3-06 settings.
Setting 0: Disabled
Drive runs at the set speed reference. A heavy load may cause the motor to stall and trip the drive with an oC or oL fault.
Setting 1: Decelerate using C1-02
If the current exceeds the Stall Prevention level set in parameter L3-06, then the drive will decelerate at decel ramp 1
(C1-02). Once the current level drops below the value of L3-06 minus 2% for 100 ms, the drive accelerates back to the
speed reference at the active acceleration ramp.
YASKAWA EUROPE SIEP
Output current
Stall Prevention Level
During Acceleration
L3-02
L3-02
-15%
Output speed
Controls the output speed
to prevent the motor from stalling
Figure 5.26 Stall Prevention During Acceleration for Induction Motors
Name
Stall Prevention Level during Acceleration
Name
Stall Prevention Limit during Acceleration
Name
Stall Prevention Selection during Run
YASKAWA AC Drive L1000V Technical Manual
5.8 L: Protection Functions
common_TMo
Time
Time
Setting Range Default
0 to 150%
<1>
Setting Range Default
0 to 100%
Setting Range Default
0 to 1
<1>
50%
5
1
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