12.8 L: PROTECTION
758 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
■ L3-21 OVSup Acc/Dec Gain
No.
(Hex.)
Name Description
Default
(Range)
L3-21
(0466)
Expert
OVSup Acc/Dec Gain
Sets the proportional gain to calculate acceleration and deceleration rates.
Determined by A1-02
(0.10 - 10.00)
Set one of these parameters to enable L3-21:
• L2-29 = 2 [KEB Method = Single KEB2 Ride-Thru]
• L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 = 1 [StallP@Decel Mode = Automatic Decel
Reduction]
• L3-11 = 1 [Overvolt Supression Select = Enabled]
• H1-xx = 42 or 43 [DI Function Select = KEB Thru2 NC or KEB Thru2 NO]
Note:
• If stall prevention during deceleration function causes large speed or current ripples and L2-29 = 1, H1-xx = 42 or 43, or L3-04 = 2,
gradually decrease this parameter in 0.05-unit increments. If the drive detects ov [Overvoltage] or oC [Overcurrent], decrease this
parameter. If you decrease the gain too much, it can cause a delay in control in the DC bus voltage or the deceleration time could be
longer than the best deceleration time.
• If sudden increases in the regenerative load cause ov faults and L3-11 = 1, gradually increase this parameter in 0.1-unit increments. If
there are large speed ripples, gradually decrease this parameter in 0.05-unit increments.
■ L3-22 StallP@Acc Deceleration Time
No.
(Hex.)
Name Description
Default
(Range)
L3-22
(04F9)
StallP@Acc Deceleration
Time
Sets the momentary deceleration time that the drive will use when it tries to accelerate a PM
motor and detected motor stalls. This function is applicable when L3-01 = 2 [StallP Mode@Accel
= General Purpose].
0.0 s
(0.0 - 6000.0 s)
Set this parameter to 0.0 s to disable this function. The drive will decelerates in the deceleration time applicable at
the time when a motor stall occurs.
■ L3-23 CHP Stall P Selection
No.
(Hex.)
Name Description
Default
(Range)
L3-23
(04FD)
CHP Stall P Selection
Sets the function to automatically decrease the Stall Prevention Level during Run for constant
output ranges.
1
(1, 2)
1 : Level@L3-06
The drive uses the level set in L3-06 [StallP Level@Run] through the full speed range.
2 : Automatic Reduction
The drive decreases the Stall Prevention level during run in the constant power range. The lower limit is 40% of
the L3-06 value.
■ L3-24 Acc@Rated Torque
No.
(Hex.)
Name Description
Default
(Range)
L3-24
(046E)
Expert
Acc@Rated Torque
Sets the motor acceleration time to reach the maximum frequency at the motor rated torque for
stopped single-drive motors.
Determined by o2-04, C6-
01, E2-11, and E5-01
(0.001 - 10.000 s)
Set one of these parameters to enable L3-24:
• L2-29 = 2 [KEB Method = Single KEB2 Ride-Thru]
• L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 = 1 [StallP@Decel Mode = Automatic Decel
Reduction]
• L3-11 = 1 [Overvolt Supression Select = Enabled]
• H1-xx = 42 or 43 [DI Function Select = KEB Thru2 NC or KEB Thru2 NO]
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