YASKAWA A1000 Series Quick Start Manual page 90

4 Start-Up Programming & Operation
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
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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.
No.
L3-06
<1> The upper limit and default for this setting is determined by C6-01 and L8-38.
L7-01 to L7-04: Torque Limits
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These parameters set the torque limits in each operation mode.
No.
L7-01
L7-02
L7-03
L7-04
Note: If the multi-function analog input is programmed for "10: Forward torque limit", "11: Reverse torque limit", "12: Regenerative
torque limit", or "15: General torque limit", the drive uses the lower value in L7-01 through L7-04, or analog input torque limit.
Figure 79
REV motor rotation
90
Name
Stall Prevention Selection During Run
Name
Stall Prevention Level During Run
Name
Forward Torque Limit
Reverse Torque Limit
Forward Regenerative Torque Limit
Reverse Regenerative Torque Limit
positive torque reference
REV run regenerative
10: Positive Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-04
quadrant 2
quadrant 3
11: Negative Torque Limit
15: Torque Limit
Parameter L7-03
REV run motoring
negative torque reference
Figure 79 Torque Limit Parameters and Analog Input Settings
quadrant 1
quadrant 4
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide
Setting Range
0 to 2
Setting Range
30 to 150
<1>
Setting Range
0 to 300%
0 to 300%
0 to 300%
0 to 300%
FWD run motoring
10: Positive Torque Limit
15: Torque Limit
Parameter L7-01
FWD motor rotation
11: Negative Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-02
FWD run regenerative
YEC_QSGonly
Default
1
Default
<1>
Default
200%
200%
200%
200%