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1.8 L: Protection Functions
Setting 0: Disabled
The drive decelerates according to the set deceleration time. High inertia loads or rapid deceleration may trigger an overcurrent
(oC) fault. Switch to another L3-04 selection if an oC fault occurs.
Setting 1: General-purpose Stall Prevention
The drive tries to decelerate within the set deceleration time. The drive pauses deceleration when the output current exceeds
the Stall Prevention level and then continues deceleration when the output current drops below that level. Stall Prevention
may be triggered repeatedly to avoid an overcurrent (oC) fault.
Figure 1.67
illustrates the function of Stall Prevention during deceleration.
Setting 4: Overexcitation Deceleration
Overexcitation Deceleration (increasing the motor flux) is faster than deceleration with no Stall Prevention (L3-04 = 0). Setting
4 changes the selected decel time and functions to provide protection from an overvoltage trip.
Deceleration (Induction Motors) on page 130
Setting 6: Enable (Current Limit)
The deceleration rate is automatically adjusted during deceleration of the load while limiting the regeneration current at the
setting value of the stall prevention level during deceleration (L3-14).
The stall prevention level may be reached if an external force is applied in the regeneration direction, dramatically decreasing
the possibility of stopping the motor.
n
L3-05: Stall Prevention Selection during Run
Determines how Stall Prevention works during Run. Stall Prevention during run prevents the motor from stalling by
automatically reducing the speed when a transient overload occurs while the motor is running at constant speed.
No.
L3-05
Note:
Stall Prevention during run is disabled when the output frequency is 6 Hz or lower regardless of the L3-05 and L3-06 settings.
Setting 0: Disabled
Drive runs at the set frequency reference. A heavy load may cause the motor to stall and trip the drive with an oC or oL fault.
114
Output Frequency
specified deceleration time
Figure 1.67 Stall Prevention During Deceleration
for details.
L3-14
Figure 1.68 Deceleration for Current Limit
Name
Stall Prevention Selection During Run
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual
Deceleration characteristics
when Stall Prevention was
triggered during deceleration
Time
15% of rated current
Frequency reference
Setting Range
0 to 2
Refer to Overexcitation
Default
1
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