YASKAWA GA700 Technical Manual page 850

11.9 L: Protection Function
Note:
• If the velocity or current ripples are significant while the stall prevention during deceleration function is operating, and the drive is set
such that L2-29 = 1, H1-xx = 7A or 7B, or L3-04 = 2, gradually reduce the setting value in increments of 0.05. Reduce the setting value
of L3-21 if ov [Overvoltage] or oC [Overcurrent] issues occur. If the gain is reduced too significantly, delay in control could develop in
the DC bus voltage or the actual deceleration time could be longer than the optimal deceleration time.
• Gradually increase the setting value in increments of 0.1 when ov issues occur due to sudden increases in regenerative load while L3-11
= 1. Gradually reduce the setting value in increments of 0.05 if speed ripples are significant.
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L3-22: DecTime atStallPrevent duringAcc
No.
Name
(Hex.)
L3-22 DecTime
atStallPrevent
(04F9)
duringAcc
When set to 0.0 s, this function is disabled. Decelerates in the deceleration time valid at the time when a motor
stall occurs.
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L3-23: CHP Stall P Selection
No.
Name
(Hex.)
L3-23 CHP Stall P Selection
(04FD)
0 : Level set in L3-06
The level set in L3-06 [Stall Prevent Level during Run] is used throughout the entire speed range.
1 : Automatic Reduction
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-
06.
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L3-24: Motor Accel Time for Inertia Cal
No.
Name
(Hex.)
L3-24 Motor Accel Time for
Inertia Cal
(046E)
This parameter is enabled when any of the following settings are made.
• L2-29 = 1 [KEB Method Selection = Single Drive KEB Ride-Thru 2]
• L3-04 = 2 [Decel Stall Prevention Selection = Automatic Decel Reduction]
• L3-11 = 1 [OV Suppression Function Select = Enabled]
• H1-xx = 7A or 7B [MFDI Function Select = KEB Ride-Thru 2 (N.O./N.C.)]
Note:
The value of Yaskawa standard motors (4 poles) is automatically set to the value of L3-24 when the setting of E2-11 [Motor Rated
Power (kW)] is changed by the Auto-Tuning process. When using PM motors, the setting value of L3-24 is changed in accordance with
the setting of E5-01 [PM Motor Code Selection].
Automatic Adjustment of Parameters
Execute the Inertia Tuning process when A1-02 = 3 or 7 [Control Method Selection = Closed Loop Vector
Control or PM Closed Loop Vector Control]. Parameters are automatically adjusted.
Manual Parameter Input
Derive the motor acceleration time using the following expression.
• J = Moment of inertia of motor (kg m
Motor
• n = Motor rated speed (min
rated
850
V/f CL-V/f OLV CLV AOLV
Sets the brief deceleration time used when stalling occurs while accelerating
a PM motor. This function is valid when L3-01 = 1 [Stall Prevent Select
duringAccel = General Purpose].
V/f CL-V/f OLV CLV AOLV
Selects whether to automatically diminish the Stall Prevent Level during
Run for constant output ranges.
V/f CL-V/f OLV CLV AOLV
Sets the motor acceleration time taken to reach the maximum frequency at
the motor rated torque for single drive motors that are stopped.
2 )
-1 , r/min)
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
0.0 s
(0.0 - 6000.0 s)
Default
(Range)
0
(0, 1)
Default Setting
(Range)
Determined by o2-04,
C6-01, E2-11, and
E5-01
(0.001 - 10.000 s)