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5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
305
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L3-02/L3-14: Stall Prevention Level during Acceleration/Deceleration
There is normally no need to change these parameters from their default values.
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.
• 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.
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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.
Figure 5.95
Figure 5.95 Stall Prevention Level and Limit During Acceleration
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L3-04: Stall Prevention Selection during Deceleration
Stall prevention during deceleration prevents the motor from stalling when a large load is imposed on the motor or rapid
deceleration is performed.
Setting 0: Disabled
The drive decelerates according to the set deceleration time.
High inertia loads or rapid deceleration may trigger an overcurrent (oC) fault. Switch to another L3-04 selection if an oC
fault occurs.
Setting 1: General-purpose Stall Prevention
With this setting the drive tries to decelerate within the set deceleration time. When the output current exceeds the Stall
Prevention level, the drive pauses deceleration. Deceleration continues as soon as the output current drops below that
level. Stall Prevention may be triggered repeatedly to avoid an overcurrent (oC) fault.
No.
<1> The upper limit and the default setting depend on C6-01, Drive Duty Selection, and L8-38, Carrier Frequency Reduction Selection.
Name
Setting Range
Default
L3-02
Stall Prevention Level during Acceleration
0 to 150%
L3-14
Stall Prevention Level during Deceleration
80 to 150%
No.
Name
Setting Range
Default
L3-03
Stall Prevention Limit during Acceleration/Deceleration
0 to 100%
50%
No.
<1> Settings 4 are not available in OLV/PM, AOLV/PM and CLV/PM.
Name
Setting Range
Default
L3-04
Stall Prevention Selection during Deceleration
0, 1, 4, 6
1
Stall Prevention level during Acceleration
Output frequency
L3-03
E1-06
Base frequency
L3-02
L3-14
SIEP_C710636_02B_1_0.book 305 ページ 2015年11月25日 水曜日 午後4時56分