Parameter Details
5
5.8 L: Protection Functions
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 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.
■ L3-05: Stall Prevention during RUN
No.
(Hex.)
Name Description
Default
(Range)
L3-05
(0493)
Stall Prevention during RUN Sets the function to enable and disable Stall Prevention During Run. 2
(0 - 2)
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].
■ L3-06: Stall Prevent Level during Run
No.
(Hex.)
Name Description
Default
(Range)
L3-06
(0494)
Stall Prevent Level during
Run
Sets the output current level to enable the Stall Prevention function during operation as a percentage
of the drive rated output current.
Determined by L8-38
(5 - 120%)
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.
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