YASKAWA A1000 Technical Manual page 114

4.6 Basic Drive Setup Adjustments
Setting 4: Overexcitation Deceleration 1
Overexcitation Deceleration 1 (increasing the motor flux) is faster than deceleration with no Stall Prevention (L3-04 = 0).
Setting 4 changes the selected decel time and functions to provide protection from an overvoltage trip.
Setting 5: Overexcitation Deceleration 2
Overexcitation Deceleration 2 slows down the motor while trying to maintain the DC bus voltage at the level set to parameter
L3-17. This function shortens the achievable deceleration time more than by using Overexcitation Deceleration 1. Setting 5
will shorten/lengthen the decel time to maintain the L3-17 bus level.
n 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.
L3-05
Note: 1. This function 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).
n 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.
No.
L3-06
<1> The upper limit and default for this setting is determined by C6-01 and L8-38.
n L7-01 to L7-04: Torque Limits
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 lowest value from L7-01 through L7-04, or analog input torque limit.
114
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
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide
Setting Range
0 to 2
Setting Range
<1>
30 to 150
Setting Range
0 to 300%
0 to 300%
0 to 300%
0 to 300%
Default
1
Default
<1>
Default
200%
200%
200%
200%