12.9 L: Protection Functions
710 YASKAWA SIEPC71061753C GA500 Technical Manual
Note:
The function to automatically reduce the stall prevention level does not operate when L3-01 = 3 [Stall Prevention during Accel =
Current Limit Method].
Figure 12.122 Stall Prevent Level during Accel/Limit
■ L3-04: Stall Prevention during Decel
No.
(Hex.)
Name Description
Default
(Range)
L3-04
(0492)
Stall Prevention during
Decel
Sets the method that the drive will use to prevent overvoltage faults when decelerating.
1
(Determined by A1-02)
Note:
1. To connect a dynamic braking option (braking resistor or braking resistor unit) to the drive, set this parameter to 0 or 3. Parameter
settings 1, 2, 4, 5, and 7 will enable Stall Prevention function during deceleration, and the dynamic braking option will not function.
2. The setting range changes when the A1-02 [Control Method Selection] value changes:
• When A1-02 = 5 [OLV/PM], the setting range is 0 to 2.
• When A1-02 = 6 or 8 [AOLV/PM or EZOLV], the setting range is 0 or 1.
Stall Prevention during deceleration controls the deceleration as specified by the DC bus voltage and does not let
high inertia or fast deceleration cause ov [Overvoltage] faults.
0 : Disabled
The drive decelerates as specified by the deceleration time. If the deceleration time is too short, the drive can
detect an ov fault.
Note:
If an ov fault occurs, connect a dynamic braking option to the drive. If an ov fault occurs when you connect a dynamic braking option
and A1-02 = 0 or 2 [Control Method Selection = V/f or OLV] and L3-04 = 0, set L3-04 = 3.
1 : General Purpose
The drive decelerates as specified by the deceleration time. When the DC bus voltage is more than the Stall
Prevention level, the drive stops deceleration until the DC bus voltage is less than the Stall Prevention Level. The
drive then starts to decelerate at the set deceleration time. Frequent use of Stall Prevention will help prevent ov
faults when the deceleration time is shorter than the drive can usually accept.
Note:
The Decel Stall Prevention function will increase the deceleration time to stop and the deceleration time will be longer than the setting.
This function is not applicable for conveyor applications because the precision of the stop position is very important. As an alternative,
use a dynamic braking option in these applications.
The input voltage setting of E1-01 [Input AC Supply Voltage] sets the DC bus voltage level for Stall Prevention.
Table 12.68 Stall Prevention Level during Deceleration
Drive Input Voltage Stall Prevention Level during Deceleration
200 V Class 377 V
400 V Class 754 V
Figure 12.123 shows the Stall Prevention during deceleration function.
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