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No.
Name
Description
Range
Def.
Control
Mode
Addr.
Hex
Pg.
V/
f
O
L
V
P
M
L3-04
Stall Prevention Selection
during Deceleration
When using a braking resistor, use setting "0". Setting "3" is
used in specific applications.
0: Disabled - The drive decelerates at the active deceleration
rate. If the load is too large or the deceleration time is too short,
an ov fault may occur.
1: General Purpose - The drive decelerates at the active
deceleration rate, but if the main circuit DC bus voltage
reaches the Stall Prevention level, deceleration will stop.
Deceleration will continue once the DC bus level drops below
the Stall Prevention level.
2: Intelligent - The active deceleration rate is ignored and the
drive decelerates as fast as possible without hitting ov fault
level. Range: C1-02 / 10.
3: Stall Prevention with Braking Resistor - Stall Prevention
during deceleration is enabled in coordination with dynamic
braking.
4: Overexcitation Deceleration - Decelerates with the flux
level determined by n3-13 (Overexcitation Gain).
7: Overexcitation Deceleration 3 - Applies more braking
power than normal overexcitation deceleration. Yaskawa
recommends extra caution due to the heavy load on the motor.
0 to 4; 7
<9>
1
S
S
S
492
L3-05
Stall Prevention Selection
during Run
Selects the Stall Prevention method to use to prevent drive
faults during run.
0: Disabled - Drive runs a set frequency. A heavy load may
cause the drive to trip on an oC or oL fault.
1: Decel Time 1 - The drive will decelerate at Decel Time 1
(C1-02) if the output current exceeds the level set by L3-06.
Once the current level drops below the L3-06 level, the drive
will accelerate back to its frequency reference at the active
acceleration rate.
2: Decel Time 2 - Same as setting 1 except the drive decelerates
at Decel Time 2 (C1-04).
When output frequency is 6 Hz or less, Stall Prevention during
run is disabled regardless of the setting in L3-05.
0 to 2
1
A − A
493
L3-06
Stall Prevention Level during
Run
Enabled when L3-05 is set to "1" or "2". 100% is equal to the
drive rated current.
Decrease the set value if stalling or excessive current occurs
with the default settings.
30 to 150
<18>
<8>
<18>
A − A
494
L3-11
ov Suppression Function
Selection
Enables or disables ov suppression function, which allows the
drive to change the output frequency as the load changes, thus
preventing an ov fault.
0: Disabled
1: Enabled
Note:
The frequency reference and motor speed diverge as the
regenerative energy begins to flow back into the DC bus and
triggers the ov suppression function. Disable this function
when using a braking resistor.
0, 1
0
A A A
4C7
L3-17
<5>
Overvoltage Suppression and
Stall Prevention Desired DC
Bus Voltage
Sets the desired value for the DC bus voltage during
overvoltage suppression and Stall Prevention during
deceleration. Enabled only when L3-04 = 2 or L3-11 = 1.
150 to 400
V
370 V
<6>
A A A
462
L3-20
Main Power Circuit Voltage
Adjustment Gain
Sets the proportional gain used by KEB, Stall Prevention and
overvoltage suppression.
If ov or Uv1 occurs at the beginning of KEB deceleration,
slowly increase this setting by 0.1.
0.00 to
5.00
1.00
A A A
465
L3-21
Accel/Decel Rate Calculation
Gain
Sets the proportional gain used to calculate the deceleration
rate during KEB, ov suppression function and Stall Prevention
during deceleration (L3-04 = 2).
This parameter does not typically require adjustment. Increase
the value in steps of 1.0 if overcurrent and overvoltage occur.
0.00 to
200.00
1.00
A A A
466
L3-22
Deceleration Time at Stall
Prevention during
Acceleration
Sets the deceleration time used for Stall Prevention during
acceleration in Open Loop Vector Control for PM motors.
When set to 0, the drive decelerates at the normal deceleration
time.
0.0 to
6000.0
0.0 s
−
− A
4F9
B.2 Parameter Table
386
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual