YASKAWA HV600 Technical Reference page 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.
■
L3-21: OVSuppression Accel/Decel P Gain
No.
Name
(Hex.)
L3-21 OVSuppression Accel/Decel
P Gain
(0466)
Expert
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.
■
L3-23: Stall P Reduction at Constant HP
No.
Name
(Hex.)
L3-23 Stall P Reduction at
Constant HP
(04FD)
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.
Name
(Hex.)
L3-24 Motor Accel Time @ Rated
Torque
(046E)
Expert
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
= Moment of inertia of motor (kg m
Motor
• n
= Motor rated speed (min
rated
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Sets the proportional gain to calculate acceleration and deceleration rates.
Sets the function to automatically decrease the Stall Prevention Level during Run for constant output
ranges.
Sets the motor acceleration time to reach the maximum frequency at the motor rated torque for
stopped single-drive motors.
2
)
-1
, r/min)
Description
Description
Description
5.8 L: Protection Functions
Default
(Range)
1.00
(0.10 - 10.00)
Default
(Range)
0
(0, 1)
Default
(Range)
Determined by o2-04, E2-11
(0.001 - 10.000 s)
5
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