YASKAWA U1000 iQpump Drive, Technical Manual, Page: 317 / 706

Output current
L3-02
Output frequency
Time
Time
Deceleration
using L3-22
L3-27
L3-27
15 % of L3-02
Figure 5.92 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 value set to L3-02, Stall Prevention
Level during Acceleration.
Frequency reference
15% of rated current
L3-02
Output current
Output frequency
Figure 5.93 Current-Limited Acceleration
n L3-02/L3-14: Stall Prevention Level during Acceleration/Deceleration
Set the output voltage level at which to enable stall prevention during acceleration and deceleration as a percentage of drive
rated current. L3-02 is valid when stall prevention is selected during acceleration (L3-01 = 1, 3). L3-14 is valid when stall
prevention is selected during deceleration (L3-04 = 1, 6). Decrease the setting values if stalling occurs when parameters are
set to default. There is normally no need to change these parameters from their default values.
No. Name Setting Range Default
L3-02 Stall Prevention Level during Acceleration
0 to 150%
<1> <1>
L3-14 Stall Prevention Level during Deceleration
80 to 150%
<1> <1>
<1> The upper limit and default value are determined by C6-01, Drive Duty Selection, and L8-38, Carrier Frequency Reduction Selection.
• Stalling may occur when the motor is rated at a smaller current than the drive rated output current and the stall prevention
default settings are used. Set L3-02/L3-14 appropriately if stalling occurs.
• Also set parameter L3-03 when operating the motor in the constant power range.
n L3-03: Stall Prevention Limit during Acceleration/Deceleration
The Stall Prevention level is automatically reduced when the motor is operated in the constant power range. L3-03 sets the
lower limit for this reduction as a percentage of the drive rated current.
No. Name Setting Range Default
L3-03 Stall Prevention Limit during Acceleration/Deceleration 0 to 100% 50%
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual 317
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Parameter Details