Parameter Details
5
5.8 L: Protection Functions
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 327
Note:
• If stall prevention during deceleration function causes ov [Overvoltage] and Uv1 [DC Bus Undervoltage] faults when you start deceleration
and 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.
â– 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. 1.00
(0.10 - 10.00)
Set one of these parameters to enable L3-21:
• L3-04 = 2 [Stall Prevention during Decel = Intelligent (Ignore Decel Ramp)]
• L3-11 = 1 [Overvoltage Suppression Select = Enabled]
Note:
• If stall prevention during deceleration function causes large speed or current ripples and 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.
â– 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.
â– 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, E2-11
(0.001 - 10.000 s)
Set one of these parameters to enable L3-24:
• L3-04 = 2 [Stall Prevention during Decel = Intelligent (Ignore Decel Ramp)]
• L3-11 = 1 [Overvoltage Suppression Select = Enabled]
Note:
When Auto-Tuning changes the value of E2-11 [Motor Rated Power], the drive will automatically set L3-24 to the value for a Yaskawa
standard motor (4 poles).
Manually Adjust Parameters
Use this formula to find the motor acceleration time:
• J
Motor
= Moment of inertia of motor (kg m
2
)
• n
rated
= Motor rated speed (min
-1
, r/min)
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