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Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to speed
fast enough, causing an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration. Operation varies depending on the control mode.
• V/f Control, V/f Control with PG, and Open Loop Vector Control:
Acceleration is reduced when the output current value exceeds 85% of the level set to parameter L3-02 for a longer than the
time set to L3-27. The acceleration stops when the current exceeds L3-02. Acceleration continues when the current falls
below L3-02 for longer than the time set to L3-27.
The Stall Prevention level is automatically reduced in the constant power range.
Refer to L3-03: Stall Prevention Limit
during Acceleration on page 142
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 1.96 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 142
). 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 1.97 Stall Prevention During Acceleration for Permanent Magnet Motors
Note:
PM motor control modes are not available in A1000 HHP drive models.
1.8 L: Protection Functions
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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1
Parameter Details