YASKAWA A1000 Series Technical Manual page 259

Setting 4: Overexcitation Deceleration 1
Overexcitation Deceleration 1 (increasing the motor flux) is faster than deceleration with no Stall Prevention (L3-04 = 0).
Refer to Overexcitation Deceleration (Induction Motors) on page 277
Setting 5: Overexcitation Deceleration 2
Overexcitation Deceleration 2 slows down the motor while trying to maintain the DC bus voltage at the level set in
parameter L3-17. By doing this, the achievable deceleration time can even be shorter than with Overexcitation
Deceleration 1. Refer to Overexcitation Deceleration (Induction Motors) on page 277
L3-05: Stall Prevention Selection during Run
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Stall Prevention during run can prevent a motor from stalling by automatically reducing the speed when a transient
overload occurs while the motor is running at constant speed.
This parameter determines how Stall Prevention works during run.
No.
L3-05
Note: 1. This function is available in V/f, V/f w/PG, and OLV/PM.
2. When output frequency is 6 Hz or less, Stall Prevention during run is disabled regardless of the setting in L3-05 and L3-06.
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, then the drive will decelerate at decel time 1 (C1-
02). Once 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).
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).
The Stall Prevention level can be adjusted using an analog input. Refer to
Settings on page 237 for details.
No.
L3-06
<1> The upper limit and default for this setting is determined by C6-01 and L8-38.
L3-23: Automatic Reduction Selection for Stall Prevention during Run
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This function reduces the Stall Prevention during run level in the constant power range.
No.
L3-23 Automatic Reduction Selection for Stall Prevention During Run
Setting 0: Disabled
The level set in L3-06 is used throughout the entire speed range.
Setting 1: Enabled
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-06.
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Name
Stall Prevention Selection During Run
Name
Stall Prevention Level During Run
Name
5.8 L: Protection Functions
for details.
for details.
Setting Range
0 to 2
Multi-Function Analog Input Terminal
Setting Range
30 to 150
<1>
Setting Range
0 or 1
Default
1
Default
<1>
5
Default
0
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