YASKAWA A1000 Series Technical Manual page 257

Figure 5.97
Figure 5.97 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.
L3-02: Stall Prevention Level during Acceleration
■
Sets the output current level at which the Stall Prevention during acceleration is activated.
No.
L3-02
<1> The upper limit and default value is determined by the duty rating and the carrier frequency derating selection (C6-01 and L8-38 respectively).
• Stalling may occur when the motor is rated at a smaller capacity than the drive and the Stall Prevention default settings
are used. Set L3-02 as appropriate if stalling occurs.
• When operating the motor in the constant power range, also set parameter L3-03.
■ L3-03: Stall Prevention Limit during Acceleration
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.
L3-03
Figure 5.98
L3-22: Deceleration Time at Stall Prevention during Acceleration
■
Sets the brief deceleration time used when stalling occurs while accelerating a PM motor. When set to 0, this function is
disabled and the drive will decelerate at the selected deceleration time when stalling occurs.
The function is effective only in Open Loop Vector Control for PM motors and if parameter L3-01 is set to 1.
No.
L3-22
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Output current
L3-02
Output frequency
L3-27
Name
Stall Prevention Level during Acceleration
Name
Stall Prevention Limit during Acceleration
Stall Prevention level during Acceleration
Base frequency
Figure 5.98 Stall Prevention Level and Limit During Acceleration
Name
Deceleration Time at Stall Prevention During Acceleration
Time
L3-27
Time
Deceleration
using L3-22
L3-02
L3-03
Output frequency
E1-06
5.8 L: Protection Functions
15 % of L3-02
Setting Range
0 to 150%
<1>
Setting Range
0 to 100%
Setting Range
0 to 6000.0 s
Default
<1>
Default
50%
5
Default
0.0 s
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