10.11 L: Protection Functions
516 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
◆ L3: Stall Prevention
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L3-01
(048F)
Stall Prevention during
Accel
Sets the method of the Stall Prevention During Acceleration.
0 : Disable
1 : Enabled
2 : Intelligent (Ignore Accel Ramp)
3 : Current Limit Acceleration
1
(0 - 3)
751
L3-02
(0490)
Stall Prevent Level
during Accel
Sets the output current level as a percentage of the drive rated output current that the
drive uses when the Stall Prevention function is enabled during acceleration.
Note:
The upper limit of this setting is determined by L8-38 [Carrier Frequency
Reduction].
Determined by L8-38
(0 - 150%)
752
L3-03
(0491)
Stall Prevent Limit
during Accel
Sets the lower limit for the stall prevention level used in the constant output range as a
percentage of the drive rated output current.
50%
(0 - 100%)
752
L3-04
(0492)
Stall Prevention during
Decel
Sets the method that the drive will use to prevent overvoltage faults when it decelerates.
Note:
To connect a dynamic braking option (braking resistor or braking resistor unit) to
the drive, set this parameter to 0 or 3. Parameter values 1, 2, 4, and 5 will enable
Stall Prevention function during deceleration, and the dynamic braking option will
not function.
0 : Disable
1 : General Purpose
2 : Intelligent (Ignore Accel Ramp)
3 : General Purpose w/ DB resistor
4 : Overexcitation/High Flux 1
5 : Overexcitation/High Flux 2
0
(0 - 5)
752
L3-05
(0493)
Stall Prevention during
RUN
Sets the function to enable and disable Stall Prevention During Run.
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 : Disable
1 : Deceleration Time 1 (C1-02)
2 : Deceleration Time 2 (C1-04)
1
(0 - 2)
754
L3-06
(0494)
Stall Prevent Level
during Run
Sets the output current level at which the Stall Prevention function is enabled during run
when the drive rated output current is 100%.
Note:
• This parameter is valid if L3-05 = 1, 2 [Stall Prevent Select during Run = Decel
time 1, Decel time 2].
• The upper limit of this setting is determined by L8-38 [Carrier Frequency
Reduction].
Determined by L8-38
(30 - 150%)
754
L3-17
(0462)
DC Bus Regulation
Level
Sets the target value for the DC bus voltage when the Decel Stall Prevention function
(Intelligent Stall Prevention) are active.
200 V Class: 375 V, 400
V Class: 750 V
(200 V Class: 150 to 400
V, 400 V Class: 300 to
800 V)
755
L3-20
(0465)
Expert
DC Bus Voltage
Adjustment Gain
Sets the proportional gain used to control the DC bus voltage.
Determined by A1-02
(0.00 - 5.00)
755
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)
755
L3-23
(04FD)
Stall P Reduction at
Constant HP
Sets the function to automatically decrease the Stall Prevention Level during Run for
Constant Horse Power (CHP) part of the speed range.
0 : Use L3-06 for Entire Speed Range
1 : Automatic Reduction @ CHP Region
0
(0, 1)
755
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
and E2-11
(0.001 - 10.000 s)
755
L3-25
(046F)
Expert
Load Inertia Ratio
Sets the ratio between motor inertia and machine inertia.
1.0
(1.0 - 1000.0)
756
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