5.8 L: Protection Functions
304 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Figure 5. 92
Figure 5.92 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 307.) Acceleration will not resume until the output current falls 15% below the setting in
L3-02.
Figure 5. 93
Figure 5.93 Stall Prevention During Acceleration for Permanent Magnet Motors
Setting 3: Enabled (Current Limit)
The acceleration rate is automatically adjusted while limiting the output current at the setting value of the stall prevention
level during acceleration (L3-02).
The acceleration rate is automatically adjusted during acceleration of the load (the output current) increases and the
current limit is exceeded.
Figure 5. 94
Figure 5.94 Current-limited Acceleration
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
Frequency reference
15% of rated current
L3-02
Output current
Output frequency
SIEP_C710636_02B_1_0.book 304 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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