12.9 L: Protection Functions
712 YASKAWA SIEPC71061753C GA500 Technical Manual
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:
• An output frequency less than 6 Hz disables Stall Prevention during Run. The setting values of L3-05 and L3-06 [Stall Prevent Level
during Run] do not have an effect.
• The setting range changes when the A1-02 [Control Method Selection] value changes:
–A1-02 = 0, 5 [V/f, OLV/PM] : 0 to 2
–A1-02 =8 [EZOLV] : 0, 3
0 : No
The drive runs at the set frequency reference. A heavy load can cause the motor to stall and trip the drive with oC
[Overcurrent] or oL1.
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 is at the set frequency.
2 : Deceleration Time 2 (C1-04)
This setting functions the same as Setting 1 [Deceleration Time 1 (C1-02)]. When you enable the Stall Prevention
function, the drive decelerates in the time set in C1-04 [Deceleration Time 2].
3 : Intelligent (Ignore Decel Ramp)
Enabled when A1-02 = 8 [EZOLV]. The drive operates with the largest possible output current to prevent motor
stalling.
■ L3-06: Stall Prevent Level during Run
No.
(Hex.)
Name Description
Default
(Range)
L3-06
(0494)
Stall Prevent Level during
Run
Sets the output current level at which the Stall Prevention function is enabled during run when the
drive rated output current is 100%.
Determined by C6-01
(5 - 150%)
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 to the setting range changes when the setting for C6-01 [Normal / Heavy Duty Selection] changes.
–150% when C6-01 = 0 [Heavy Duty Rating]
–120% when C6-01 = 1 [Normal Duty Rating]
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 use the input gain and bias
settings for terminals A1 and A2 to change the stall prevention level during run.
If you set the input level for terminals A1 and A2 [H3-xx = 8] and L3-06, the drive will use the smaller value for
Stall Prevent Level during Run.
Figure 12.124 Stall Prevention Level during Run with Analog Input
■ L3-11: Overvoltage Suppression Select
No.
(Hex.)
Name Description
Default
(Range)
L3-11
(04C7)
Overvoltage Suppression
Select
Sets the overvoltage suppression function.
0
(0, 1)
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