Frequency reference
L3-14
15% of rated current
Figure 5.96 Deceleration for Current Limit
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L3-05: Stall Prevention Selection during Run
Determines how Stall Prevention works during Run. Stall Prevention during run prevents the motor from stalling by
automatically reducing the speed when a transient overload occurs while the motor is running at constant speed.
No. Name Setting Range Default
L3-05 Stall Prevention Selection During Run 0 to 2 1
Note: 1. This parameter is available in V/f, V/f w/PG, and OLV/PM.
2. Stall Prevention during run is disabled when the output frequency is 6 Hz or lower regardless of the L3-05 and L3-06 settings.
Setting 0: Disabled
Drive runs at the set frequency reference. A heavy load may cause the motor to stall and trip the drive with an oC or oL fault.
Setting 1: Decelerate Using C1-02
If the current exceeds the Stall Prevention level set in parameter L3-06, the drive will decelerate at decel time 1 (C1-02). When
the current level drops below the value of L3-06 minus 2% for 100 ms, the drive accelerates back to the frequency reference
at the active acceleration time.
Setting 2: Decelerate Using C1-04
Same as setting 1 except the drive decelerates at decel time 2 (C1-04).
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L3-06: Stall Prevention Level during Run
Sets the current level to trigger Stall Prevention during run. Depending on the setting of parameter L3-23, the level is
automatically reduced in the constant power range (speed beyond base speed). A setting of 100% is equal to the drive rated
current.
The Stall Prevention level can be adjusted using an analog input. Refer to Multi-Function Analog Input Terminal
Settings on page 301 for details.
No. Name Setting Range Default
L3-06 Stall Prevention Level During Run
30 to 150%
<1> <1>
<1> The upper limit and default for this setting is determined by C6-01 and L8-38.
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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 decelerates at the selected deceleration time when stalling occurs.
The function is effective only in OLV/ PM control and when parameter L3-01 is set to 1.
No. Name Setting Range Default
L3-22 Deceleration Time at Stall Prevention During Acceleration 0.0 to 6000.0 s 0.0 s
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L3-23: Automatic Reduction Selection for Stall Prevention during Run
Reduces the Stall Prevention during run level in the constant power range.
No. Name Setting Range Default
L3-23 Automatic Reduction Selection for Stall Prevention During Run 0, 1 0
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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5
Parameter Details
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