YASKAWA HV600 Technical Reference page 325

The drive adjusts the deceleration rate to keep the DC bus voltage at the L3-17 [DC Bus Regulation Level] level. This
makes the shortest possible deceleration time and will not let the motor stall. The drive ignores the selected
deceleration time and the possible deceleration time cannot be less than 1/10 of the set deceleration time.
This function uses these parameters to adjust the deceleration rate:
• L3-20 [DC Bus Voltage Adjustment Gain]
• L3-21 [OVSuppression Accel/Decel P Gain]
• L3-24 [Motor Accel Time @ Rated Torque]
• L3-25 [Load Inertia Ratio]
4 : Overexcitation/High Flux
The drive enables Overexcitation/High Flux and enables a shorter deceleration time than when L3-04 = 0.
Note:
• If the overexcitation time is long and you decelerate frequently, the drive can detect oL1 [Motor Overload] faults. If the drive detects oL1,
decrease the deceleration time.
• The deceleration time during Overexcitation Deceleration changes when the motor characteristics and machine inertia change. Adjust the
n3-13 [OverexcitationBraking (OEB) Gain] and n3-23 [Overexcitation Braking Operation] levels. Refer to "n3: HighSlip/
OverexciteBraking" for more information about the overexcitation function.
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L3-05: Stall Prevention during RUN
No.
Name
(Hex.)
L3-05 Stall Prevention during RUN Sets the function to enable and disable Stall Prevention During Run.
(0493)
Stall Prevention function during run automatically decreases the speed when an oL1 [Motor Overload] occurs while
the motor is running at constant speed to prevent the motor from stalling.
Note:
An output frequency lower than 6 Hz will disable Stall Prevention during Run. The L3-05 and L3-06 [Stall Prevent Level during Run]
settings do not have an effect.
0 : Disabled
The drive runs at the set frequency reference. A heavy load can cause the drive to detect oC [Overcurrent] or oL1 and
stall the motor.
1 : Deceleration Time 1 (C1-02)
The drive will decelerate for the time set in C1-02 [Deceleration Time 1] when the current is more than the Stall
Prevention level set in L3-06. When the current level is less than the "L3-06 setting value - 2%" for 100 ms, the drive
accelerates again for the acceleration time applicable at that time until it reaches the set frequency.
2 : Deceleration Time 2 (C1-04)
This setting functions the same as Setting 1 [Deceleration Time 1 (C1-02)]. When the Stall Prevention function is
enabled, the drive decelerates with the value set in C1-04 [Deceleration Time 2].
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L3-06: Stall Prevent Level during Run
No.
Name
(Hex.)
L3-06 Stall Prevent Level during
Run
(0494)
Note:
• This parameter is applicable when L3-05 = 1, 2 [Stall Prevention during RUN = Deceleration Time 1 (C1-02), Deceleration Time 2 (C1-
04)].
• When L3-23 = 1 [Stall P Reduction at Constant HP = Automatic Reduction @ CHP Region], the drive will automatically decrease the level
in the constant output range.
Use an Analog Input to Change the Stall Prevent Level during Run
When H3-xx = 8 [MFAI Function Selection = Stall Prevent Level During Run], you can change the stall prevention
level during run through the input gain and bias settings for terminals A1 and A2.
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Sets the output current level to enable the Stall Prevention function during operation as a percentage
of the drive rated output current.
Description
Description
5.8 L: Protection Functions
Default
(Range)
2
(0 - 2)
Default
(Range)
Determined by L8-38
(5 - 120%)
5
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