Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 749
■ L2-03 Min Baseblck Time
No.
(Hex.)
Name Description
Default
(Range)
L2-03
(0487)
Min Baseblck Time
Sets the minimum baseblock time when the drive restores power after a momentary power loss.
Determined by o2-04 and
C6-01
(0.1 - 5.0 s)
Sets the length of time that the drive will wait for the residual voltage in the motor to dissipate in estimation to the
secondary circuit time constant of the motor. If oC [Overcurrent] or ov [DC Bus Overvoltage] occur at the start of
Speed Search, after a power loss, or during DC Injection Braking, increase this setting.
■ L2-04 Powloss Ramp Time@recovery
No.
(Hex.)
Name Description
Default
(Range)
L2-04
(0488)
Powloss Ramp
Time@recovery
Sets the time for the drive output voltage to go back to correct voltage after completing speed
searches.
Determined by o2-04 and
C6-01
(0.0 - 5.0 s)
Sets the time for voltage to recover from 0 V to the value set in E1-05 [Max Output Voltage].
■ L2-05 UV Detection Lvl (Uv1)
No.
(Hex.)
Name Description
Default
(Range)
L2-05
(0489)
UV Detection Lvl (Uv1)
Sets the voltage at which a Uv1 [DC Bus Undervoltage] fault is triggered or at which the KEB
function is activated. Usually it is not necessary to change this setting.
Determined by E1-01
(Determined by E1-01)
NOTICE: Damage to Equipment. Install an AC reactor option on the input side of the power supply when setting this parameter
lower than the default value. Failure to obey will cause damage to drive circuitry.
Note:
If the low voltage detection level is near the lower limit value of L2-05, the drive will detect Uv1 during KEB Ride-Thru operation. Do
not set the value too low when you use the KEB Ride-Thru function.
■ L2-06 KEB Decel Time
No.
(Hex.)
Name Description
Default
(Range)
L2-06
(048A)
Expert
KEB Decel Time
Sets the deceleration time during KEB operation used to decrease the maximum output frequency
to 0.
0.0 s
(0.0 to 6000.0 s)
Set L2-29 = 3 or 4 [KEB Method = System KEB1 Ride-Thru or System KEB2 Ride-Thru] to enable this function.
When L2-29 = 2, 3 , 4 [KEB Method = Single KEB2 Ride-Thru, System KEB1 Ride-Thru, System KEB2 Ride-
Thru] and you do KEB Auto-Tuning, the drive will automatically set this value.
Sets the deceleration time necessary to decelerate from the frequency reference to 0 Hz when the drive detects a
momentary power loss. If a Uv1 [DC Bus Undervoltage] fault occurs during KEB operation, decrease the
deceleration time. If an ov [Overvoltage] fault occurs, increase the deceleration time.
• L2-06 = 0
The drive automatically decreases C1-09 [Fast Stop Time] to the base value to keep the DC bus voltage above
the low voltage detection level. The drive ignores L2-02 [RideThrough Time@Power Loss] in this condition.
• L2-06 ≠ 0
As shown in Figure 12.126, the frequency reference decelerates to the KEB frequency level as specified by the
deceleration rate set in L2-06 and then returns to the initial frequency reference as specified by C1-01 [Accel
Time 1]. The drive uses the setting value of the KEB frequency rate as shown in the this formula to set the KEB
frequency level:
KEB frequency level = Output frequency before power loss × (1 - (L2-02)/ (L2-06))
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