Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 751
When you input KEB Ride-Thru, KEB operation continues after the time set in L2-10 is expired. When you
cancel KEB Ride-Thru, the motor accelerates again. When you do not input KEB Ride-Thru during the time set in
L2-10, the drive accelerates to the frequency reference that the drive had before power loss in the applicable
acceleration time.
When L2-01 = 1 and L2-50 = 2, 3, or 4, and the DC bus voltage is a minimum of the value of L2-11 [KEB DC
Volt Setpoint], the drive accelerates again after the time set in L2-10 is expired. If the DC bus voltage is less than
the L2-11 value, KEB operation continues after the time set in L2-10 is expired.
Note:
• When L2-01 = 0 [Disabled], or L2-01 = 1 and L2-50 = 0 or 1 [Timer Controlled or While CPU Active], increase the value of L2-10.
Set L2-10 to cancel KEB operation if the KEB Ride-Thru is not input
• Set this parameter to 0 to disable the function.
■ L2-11 KEB DC Volt Setpoint
No.
(Hex.)
Name Description
Default
(Range)
L2-11
(0461)
Expert
KEB DC Volt Setpoint
Sets the target value that controls the DC bus voltage to a constant level in Single Drive KEB
Ride-Thru 2. Sets the DC bus voltage level that completes the KEB operation for all other KEB
methods.
Determined by E1-01
(Determined by E1-01)
■ L2-29 KEB Method
No.
(Hex.)
Name Description
Default
(Range)
L2-29
(0475)
Expert
KEB Method
Sets the KEB function operation mode.
1
(1 - 4)
Set L2-01 = 1 [RideThru@PwrLoss = Enabled], and set L2-50 = 2, 3, or 4 [RidThruMode@PwrLoss = KEB
Mode, KEB Stop Mode, or KEB Decel to Stop] or KEB Ride-Thru 1/2 [H1-xx = 40, 41, 42, or 43], to enable the
KEB function.
1 : Single KEB1 Ride-Thru
The drive monitors the DC bus voltage and uses regenerative energy from the motor to hold the DC bus voltage at
the level set in L2-11 [KEB DC Volt Setpoint].
The KEB operation continues and the deceleration rate changes as specified by C1-09 [Fast Stop Time].
Note:
• If the drive detects Uv1 [DC Bus Undervoltage] during KEB operation, decrease the value of C1-09.
• If the drive detects ov [Overvoltage] during KEB operation, increase the value of C1-09.
2 : Single KEB2 Ride-Thru
The drive does KEB operation and automatically calculates the deceleration rate to make sure that the main circuit
electrical energy and main current voltage from motor regenerative energy is equal to L2-11 [KEB DC Volt
Setpoint].
3 : System KEB1 Ride-Thru
The drive does not monitor the DC bus voltage and decelerates as specified by the KEB deceleration time set in
L2-06.
Set L2-06 to the time necessary to decelerate from the frequency reference to 0 Hz when the drive detects a
momentary power loss. The drive can decelerate and keep constant deceleration rates for more than one drive.
Note:
If you keep constant deceleration rates for more than one drive, it can trigger ov faults. Use the dynamic braking option with System
KEB Ride-Thru 1 to prevent ov faults.
4 : System KEB2 Ride-Thru
The drive monitors the DC bus voltage and decelerates for the deceleration time set in L2-06.
If the DC bus voltage increases, the drive momentarily holds the frequency to prevent ov while deceleration
continues.
Note:
When you cannot use a dynamic braking option, use System KEB Ride-Thru.
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