11.9 L: Protection Functions
962 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Note:
• If stall prevention during deceleration function causes ov [Overvoltage] and Uv1 [DC Bus Undervoltage] faults when you start
deceleration and L2-29 = 1, H1-xx = 7A or 7B, or L3-04 = 2, gradually increase this parameter in 0.1-unit increments. If the setting
value is too high, it can cause large speed or current ripples.
• If sudden increases in the regenerative load cause ov faults and L3-11 = 1, gradually increase this parameter in 0.1-unit increments. If
the setting value is too high, it can cause large speed or current ripples.
■ L3-21: OVSuppression Accel/Decel P Gain
No.
(Hex.)
Name Description
Default
(Range)
L3-21
(0466)
Expert
OVSuppression
Accel/Decel P Gain
Sets the proportional gain to calculate acceleration and deceleration rates.
Determined by A1-02
(0.10 - 10.00)
Set one of these parameters to enable L3-21:
• L2-29 = 1 [KEB Method Selection = Single Drive KEB Ride-Thru 2]
• L3-04 = 2 [Decel Stall Prevention Selection = Automatic Decel Reduction]
• L3-11 = 1 [OV Suppression Function Select = Enabled]
• H1-xx = 7A or 7B [MFDI Function Select = KEB Ride-Thru 2 (N.O./N.C.)]
Note:
• If stall prevention during deceleration function causes large speed or current ripples and L2-29 = 1, H1-xx = 7A or 7B, or L3-04 = 2,
gradually decrease this parameter in 0.05-unit increments. If the drive detects ov [Overvoltage] or oC [Overcurrent], decrease this
parameter. If you decrease the gain too much, it can cause a delay in control in the DC bus voltage or the deceleration time could be
longer than the best deceleration time.
• If sudden increases in the regenerative load cause ov faults and L3-11 = 1, gradually increase this parameter in 0.1-unit increments. If
there are large speed ripples, gradually decrease this parameter in 0.05-unit increments.
■ L3-22: PM Stall Prevention Decel Time
No.
(Hex.)
Name Description
Default
(Range)
L3-22
(04F9)
PM Stall Prevention
Decel Time
Sets the momentary deceleration time that the drive will use when it tries to
accelerate a PM motor and detected motor stalls. This function is applicable
when L3-01 = 1 [Stall Prevent Select duringAccel = General Purpose].
0.0 s
(0.0 - 6000.0 s)
Set this parameter to 0.0 s to disable this function. The drive will decelerates in the deceleration time applicable at
the time when a motor stall occurs.
■ L3-23: Stall P Reduction at Constant HP
No.
(Hex.)
Name Description
Default
(Range)
L3-23
(04FD)
Stall P Reduction at
Constant HP
Sets the function to automatically decrease the Stall Prevention Level
during Run for constant output ranges.
0
(0, 1)
0 : Use L3-06 for Entire Speed Range
The drive uses the level set in L3-06 [Stall Prevent Level during Run] through the full speed range.
1 : Automatic Reduction @ CHP Region
The drive decreases the Stall Prevention level during run in the constant power range. The lower limit is 40% of
the L3-06 value.
■ L3-24: Motor Accel Time @ Rated Torque
No.
(Hex.)
Name Description
Default
(Range)
L3-24
(046E)
Expert
Motor Accel Time @
Rated Torque
Sets the motor acceleration time to reach the maximum frequency at the
motor rated torque for stopped single-drive motors.
Determined by o2-04,
C6-01, E2-11, and
E5-01
(0.001 - 10.000 s)
Set one of these parameters to enable L3-24:
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