The Stall Prevention level is automatically reduced in the constant power range. Refer to L3-03: Stall Prevention Limit
during Acceleration on page 106.
Stall Prevention Level
During Acceleration
L3-02
L3-02
-15%
Output current
Output frequency
Time
Time
Controls the output frequency
to prevent the motor from stalling
Figure 1.61 Stall Prevention During Acceleration for Induction Motors
• Open Loop Vector Control for PM:
Acceleration stops when the output current reaches the level set to parameter L3-02. When the time set to parameter L3-27
passes, the drive decelerates using the deceleration time set to L3-22 (Refer to L3-22: Deceleration Time at Stall Prevention
during Acceleration on page 106). Deceleration stops when the current falls below 85% of L3-02,. The drive will attempt
to reaccelerate after the time set to L3-27.
Output current
L3-02
Output frequency
Time
Time
Deceleration
using L3-22
L3-27
L3-27
15 % of L3-02
Figure 1.62 Stall Prevention During Acceleration for Permanent Magnet Motors
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. Name Setting Range Default
L3-02 Stall Prevention Level during Acceleration
0 to 150%
<1> <1>
<1> The upper limit and default values are determined by parameter L8-38, Carrier Frequency Derating Selection.
• Lower L3-02 if stalling occurs when using a motor that is relatively small compared to the drive.
1.8 L: Protection Functions
YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual
105
1
Parameter Details
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