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5.8 L: Protection Functions
306
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
illustrates the function of Stall Prevention during deceleration.
Figure 5.96
Figure 5.96 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. Refer to
Overexcitation Deceleration (Induction Motors) on page 322
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.
Figure 5.97
Figure 5.97 Deceleration for Current Limit
■
L3-05: Stall Prevention Selection during Run
Stall Prevention during run can prevent a motor from stalling by automatically reducing the speed when a transient
overload occurs while the motor is running at constant speed.
This parameter determines how Stall Prevention works during run.
Note: 1.
This parameter is available in V/f, V/f w/PG, and OLV/PM.
2.
When output frequency is 6 Hz or less, Stall Prevention during run is disabled regardless of the setting in L3-05 and L3-06.
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.
Setting 1: Decelerate using C1-02
If the current exceeds the Stall Prevention level set in parameter L3-06, then the drive will decelerate at decel time
(C1-02, C1-04, C1-06, C1-08). Once the current level drops below the value of L3-06 minus 2% for 100 ms, the drive
accelerates back to the frequency reference at the active acceleration time.
Setting 2: Decelerate using C1-04
Same as setting 1 except the drive decelerates at decel time 2 (C1-04).
No.
Name
Setting Range
Default
L3-05
Stall Prevention Selection during Run
0 to 2
1
Output Frequency
Deceleration characteristics
when Stall Prevention was
triggered during deceleration
Time
specified deceleration time
Frequency reference
L3-14
15% of rated current
SIEP_C710636_02B_1_0.book 306 ページ 2015年11月25日 水曜日 午後4時56分