5.8 L: Protection Functions
282 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
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:
If the output current rises above the Stall Prevention level set in L3-02, the
n the drive stops accelerating. Acceleration
will not resume until the output current falls 15% below the setting in L3-02.
The Stall Prevention level is automatically reduced in the constant power range. Refer to L3-03: Stall Prevention
Limit during Acceleration on page 283.
Figure 5.101
Figure 5.101 Stall Prevention During Acceleration for Induction Motors
• Open Loop Vector Control for PM:
If the output current remains above
the Stall Prevention level set in L3-02 for the time set in L3-27, then the drive will
begin to decelerate using the deceleration time set in L3-22. (Refer to L3-22: Deceleration Time at Stall Prevention
during Acceleration on page 286.) Acceleration will not resume until the output current falls 15% below the setting in
L3-02.
Figure 5.102
Figure 5.102 Stall Prevention During Acceleration for Permanent Magnet Motors
Setting 2: Intelligent Stall Prevention
When L3-02 = 2, the drive will disregard the selected acceleration time and try to accelerate in the minimum time. The
acceleration rate is adjusted so that the current does not exceed the value set in parameter L3-02.
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
Output current
L3-02
Output frequency
Time
Time
Deceleration
using L3-22
L3-27
L3-27
15 % of L3-02
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