3.11 L: Protection Functions
148 YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
No.
(Hex.)
Name Description
Default
(Range)
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)
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)
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)
L3-25
(046F)
Expert
Load Inertia Ratio Sets the ratio between motor inertia and machine inertia. 1.0
(0.1 - 1000.0)
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)
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)
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)
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)
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)
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)
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)
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)
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 : Disabled
1 : Enabled
0
(0, 1)
◆ L4: Speed Detection
No.
(Hex.)
Name Description
Default
(Range)
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)
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)
L4-03
(049B)
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 = 13, 14, 15, 16 [MFDO
Function Selection = Speed Agree 2, User-set Speed Agree 2, Frequency Detection 3, Frequency
Detection 4].
Determined by A1-02
(Determined by A1-02)
L4-04
(049C)
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 = 13, 14, 15, 16 [MFDO
Function Selection = Speed Agree 2, User-set Speed Agree 2, Frequency Detection 3, Frequency
Detection 4].
Determined by A1-02
(Determined by A1-02)
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