L3: Stall Prevention - YASKAWA A1000 Technical Manual


L2-29: KEB Method Selection
Selects the way the Kinetic Energy Buffering function operates.
The KEB function is not active when L2-01 is set to 4.
Note: If a multi function input is set for Single KEB Ride-Thru 2 (H1- = 7A, 7B) the setting of L2-29 is disregarded and the KEB
mode equal to L2-29 = 1 is automatically selected.
No.
L2-29
Setting 0: Single Drive KEB Ride-Thru 1
Setting 1: Single Drive KEB Ride-Thru 2
Setting 2: System KEB Ride-Thru 1
Setting 3: System KEB Ride-Thru 2
Refer to KEB Ride-Thru Function on page 275
 L3: Stall Prevention
When the load is too high or acceleration and deceleration times are too short, the motor may be unable to keep up with
the frequency reference, resulting in excessive slip. During acceleration, this usually causes an overcurrent fault (oC),
drive overload (oL2), or motor overload (oL1). During deceleration, it can cause excessive regenerative power to flow
back into the DC bus capacitors, eventually causing the drive to fault out from overvoltage (oV). The drive can prevent
the motor from stalling and still reach the desired speed without the user needing to change the acceleration or
deceleration time settings. The Stall Prevention function can be set separately for acceleration, operating at constant
speeds, and deceleration.

L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration (L3-01) prevents tripping with overcurrent (oC), motor overload (oL1), or drive
overload (oL2) faults common when accelerating with heavy loads.
L3-01 determines the type of Stall Prevention the drive should used during acceleration.
No.
L3-01
<1> Setting 2 is not available for PM OLV.
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to
speed fast enough, thus tripping an overload fault.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Name
KEB Method Selection
for detailed explanations.
Name
Stall Prevention Selection during Acceleration
5.8 L: Protection Functions
Setting Range Default
0 to 3
Setting Range Default
0 to 2
<1>
0
1
5
281