YASKAWA GA800 Programming Manual page 457

Stall Prevention function during run prevents the motor from stalling by automatically reducing the speed when an
oL1 [Motor Overload] occurs while the motor is running at constant speed.
Note:
1. 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.
2. The setting range changes when A1-02 [Control Method] changes:
• A1-02 = 0, 1, 5 [V/f, CL-V/f, OLV/PM]: 0 to 2
• A1-02 = 8 [EZOLV]: 0, 3
0 : Disabled
The drive runs at the set frequency reference. A heavy load can cause the drive to detect oC [Overcurrent] or oL1 and
stall the motor.
1 : Deceleration Time 1 (C1-02)
The drive will decelerate for the time set in C1-02 [Deceleration Time 1] when the current is more than the Stall
Prevention level set in L3-06. When the current level is less than the "L3-06 setting value - 2%" for 100 ms, the drive
accelerates again for the acceleration time applicable at that time until it reaches the set frequency.
2 : Deceleration Time 2 (C1-04)
This setting functions the same as Setting 1 [Deceleration Time 1 (C1-02)]. When the Stall Prevention function is
enabled, the drive decelerates with the value set in C1-04 [Deceleration Time 2].
3 : Intelligent (Ignore Decel Ramp)
Available when A1-02 = 8 [EZOLV]. The drive operates with the largest possible output and prevents motor stalling.
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L3-06: Stall Prevent Level during Run
No.
Name
(Hex.)
L3-06 Stall Prevent Level during
Run
(0494)
Note:
• This parameter is applicable when L3-05 = 1, 2 [Stall Prevention during RUN = Deceleration Time 1 (C1-02), Deceleration Time 2 (C1-
04)].
• When L3-23 = 1 [Stall P Reduction at Constant HP = Automatic Reduction @ CHP Region], the drive will automatically decrease the level
in the constant output range.
• The upper limit of the setting range changes when C6-01 [Normal / Heavy Duty Selection] changes.
–150% when C6-01 = 0 [Heavy Duty Rating (HD) for Constant Torque Applications].
–110% when C6-01 = 1 [Normal Duty Rating (ND) for Variable Torque Applications].
Use an Analog Input to Change the Stall Prevent Level during Run
When H3-xx = 8 [MFAI Function Select = Stall Prevent Level During Run], you can change the stall prevention level
during run through the input gain and bias settings for terminals A1, A2, and A3.
If you set the input level for terminals A1, A2, and A3 [H3-xx = 8] and L3-06, the drive will use the smaller value for
Stall Prevent Level during Run.
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
V/f CL-V/f OLV CLV
Sets the output current level to enable the Stall Prevention function during operation as a percentage
of the drive rated output current.
Stall Prevention Level during Run (%)
100
30
0 3 V
(4 mA) (8.8 mA) (20 mA)
Figure 2.135 Stall Prevention Level during Run with Analog Input
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Input level of multi-function
analog input terminals A1,
10 V
A2, and A3
2.9 L: Protection Functions
Default
(Range)
Determined by C6-01 and
L8-38
(5 - 150%)
2
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