11.11 L: Protection Functions
422 YASKAWA SIEPC71061753C GA500 Technical Manual
No.
(Hex.)
Name Description
Default
(Range)
Ref.
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)
713
L3-22
(04F9)
PM Stall Prevention
Decel Time
Sets the momentary deceleration time that the drive will use when it tries to accelerate a
PM motor and detected motor stalls. This function is applicable when L3-01 = 1 [Stall
Prevention during Accel = Enabled].
0.0 s
(0.0 - 6000.0 s)
714
L3-23
(04FD)
Stall P Reduction at
Constant HP
Sets the function to automatically decrease the Stall Prevention Level during Run for
constant output ranges.
0 : Use L3-06 for Entire Speed Range
1 : Automatic Reduction @ CHP Region
0
(0, 1)
714
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,
C6-01, E2-11, and E5-01
(0.001 - 10.000 s)
714
L3-25
(046F)
Expert
Load Inertia Ratio
Sets the ratio between motor inertia and machine inertia.
1.0
(0.1 - 1000.0)
714
L3-26
(0455)
Expert
Additional DC Bus
Capacitors
Sets the capacity for external main circuit capacitors. Usually it is not necessary to
change this setting. Sets this parameter when you use the KEB Ride-Thru function.
0 μF
(0 to 65000 μF)
715
L3-27
(0456)
Stall Prevention
Detection Time
Sets a delay time between reaching the Stall Prevention level and starting the Stall
Prevention function.
60 ms
(0 - 5000 ms)
715
L3-34
(016F)
Expert
Torque Limit Delay
Time
Sets the filter time constant that returns the torque limit to its initial value when KEB
operation operates in Single Drive KEB Ride-Thru mode.
Determined by A1-02
(0.000 - 1.000 s)
715
L3-35
(0747)
Expert
Speed Agree Width for
Auto Decel
Sets the width for speed agreement when L3-04 = 2 [Stall Prevention during Decel =
Intelligent (Ignore Decel Ramp)]. Usually it is not necessary to change this setting.
0.00 Hz
(0.00 - 1.00 Hz)
715
L3-36
(11D0)
Current Suppression
Gain@Accel
Sets the gain to suppress current and motor speed hunting during operation when L3-01
= 3 [Stall Prevention during Accel = Current Limit Method]. Usually it is not necessary
to change this setting.
Determined by A1-02
(0.0 - 100.0)
715
L3-37
(11D1)
Expert
Current Limit P Gain
@Accel
Suppresses current hunting during acceleration. Usually it is not necessary to change
this setting.
5 ms
(0 - 100 ms)
715
L3-38
(11D2)
Expert
Current Limit I Time @
Accel
Suppresses current hunting and overshooting that occurs when the drive stalls during
acceleration. Usually it is not necessary to change this setting.
10.0
(0.0 - 100.0)
716
L3-39
(11D3)
Current Limit Filter
Time@Accel
Sets the time constant to adjust the acceleration rate when L3-01 = 3 [Stall Prevention
during Accel = Current Limit Acceleration]. Usually it is not necessary to change this
setting.
100.0 ms
(1.0 - 1000.0 ms)
716
L3-40
(11D4)
Current Limit S-Curve
@ Acc/Dec
Sets the function to enable and disable the best S-curve characteristic used for current-
limited acceleration.
0 : Disable
1 : Enabled
0
(0, 1)
716
◆ L4: Speed Detection
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L4-01
(0499)
Speed Agree Detection
Level
Sets the level to detect speed agree or motor speed.
Sets the level to detect speed agree or motor speed when H2-01 to H2-03 = 2, 3, 4, 5
[MFDO Function Selection = Speed Agree 1, User-set Speed Agree 1, Frequency
Detection 1, Frequency Detection 2].
Determined by A1-02
(Determined by A1-02)
716
L4-02
(049A)
Speed Agree Detection
Width
Sets the width to detect speed agree or motor speed.
Sets the width to detect speed agree or motor speed when H2-01 to H2-03 = 2, 3, 4, 5
[MFDO Function Selection = Speed Agree 1, User-set Speed Agree 1, Frequency
Detection 1, Frequency Detection 2].
Determined by A1-02
(Determined by A1-02)
716
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