YASKAWA AC Drive GA700 High Performance Type Technical Manual
No.
(Hex.)
Name
Description
Default
(Range)
Ref.
L3-01
(048F)
Stall Prevention during Accel
Sets the method of the Stall Prevention During Acceleration.
1
(0 - 3)
Details
L3-02
(0490)
Stall Prevent Level during Accel
Sets the output current level to activate the Stall Prevention function during acceleration as a percentage of the drive rated output current.
The upper limit of the setting range changes when C6-01 [Normal / Heavy Duty Selection] changes.
150% when C6-01 = 0 [Heavy Duty Rating].
110% when C6-01 = 1 [Normal Duty Rating].
Determined by C6-01 and L8-38
(0 - 150%)
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%)
L3-04
(0492)
Stall Prevention during Decel
Sets the method that the drive will use to prevent overvoltage faults when decelerating.
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.
The setting range changes when the A1-02 [Control Method Selection] value changes:
When A1-02 = 5 [OLV/PM], the setting range is 0 to 2.
When A1-02 = 6, 7, 8 [AOLV/PM, CLV/PM, EZOLV], the setting range is 0, 1.
The drive decelerates as specified by the deceleration time. If the deceleration time is too short, the drive can detect an ov [Overvoltage] fault.
If the DC bus voltage is more than the Stall Prevention during deceleration level, the drive stops deceleration.
The drive decelerates for the shortest time possible, keeps DC bus voltage, and prevents ov faults.
A braking resistor is necessary for this setting. The braking resistor and the drive work together for the Stall Prevention during deceleration function.
(Determined by A1-02)
L3-05
(0493)
Stall Prevention during RUN
Sets the function to enable and disable Stall Prevention During Run.
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.
The setting range changes when the A1-02 [Control Method] value changes:
A1-02 = 0, 1, 5 [V/f, CL-V/f, OLV/PM]: 0 to 2
A1-02 =8[EZOLV]: 0, 3
Determined by A1-02
(0 - Determined by A1-02)
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.
This parameter is applicable when L3-05 = 1, 2 [Stall Prevention during RUN = Deceleration Time 1 (C1-02), Deceleration Time 2 (C1-04)].
150% when C6-01 = 0 [Heavy Duty Rating 1 (HD1) for Constant Torque Applications].
110% when C6-01 = 1 [Normal Duty Rating 1 (ND1) for Variable Torque Applications].
(5 - 150%)
L3-11
(04C7)
Overvoltage Suppression Select
Sets the overvoltage suppression function.
The drive does not adjust the regenerative torque limit or the output frequency. If you apply a regenerative load, the drive can detect an ov [Overvoltage] fault. Use this setting with a dynamic braking option.
When a regenerative load increases the DC bus voltage, the drive decreases the regenerative torque limit and increases the output frequency to prevent ov
0
(0, 1)
L3-17
(0462)
DC Bus Regulation Level
Sets the target value for the DC bus voltage when the overvoltage suppression function and 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)
L3-20
(0465)
Expert
DC Bus Voltage Adjustment Gain
Sets the proportional gain used to control the DC bus voltage.
(0.00 - 5.00)
L3-21
(0466)
OVSuppression Accel/Decel P Gain
Sets the proportional gain to calculate acceleration and deceleration rates.
(0.10 - 10.00)
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 Horse Power (CHP) part of the speed range.
L3-24
(046E)
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)
Load Inertia Ratio
Sets the ratio between motor inertia and machine inertia.
1.0
(0.1 - 1000.0)
L3-26
(0455)
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.
50 ms
(0 - 5000 ms)
L3-34
(016F)
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.
(0.000 - 1.000 s)
L3-35
(0747)
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.
(0.0 - 100.0)
L3-37
(11D1)
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)
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
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.
