Parameter L2-01 [Power Loss Ride Through Select] and a digital input programmed for KEB set the KEB function end detection.
Use the Momentary Power Loss Ride-Thru Time to Cancel KEB Operation
shows an example with this configuration:
The drive starts deceleration through KEB operation. When the time set in L2-10 [Minimum KEB Time] expires, the drive stops the KEB operation and then it accelerates the motor again until it is at the frequency reference value used before the power loss.
If you do not return the DC bus voltage in the time set in L2-02 [Power Loss Ride Through Time], the drive detects Uv1 [DC Bus Undervoltage] and the drive turns off its output.
Figure 1. Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Is Expired without KEB Ride-Thru
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Use the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
shows an example with this configuration:
The drive starts deceleration through KEB operation. The drive decelerates for the time set in parameter L2-10, then it measures the DC bus voltage and the status of the digital input terminal set for KEB Ride-Thru. When the DC bus voltage is less than the level set in L2-11 [KEB DC Bus Voltage Setpoint], or if the KEB digital input is active, KEB deceleration continues. When the DC bus voltage is more than the level set in L2-11, the drive ends KEB operation. The drive accelerates the motor to the frequency reference value before the power loss, and usual operation continues. If the time set in L2-02 is expired, the drive detects Uv1. When you cancel the KEB Ride-Thru, the motor accelerates again, and usual operation continues.
Figure 2. Use the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
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Cancel KEB Operation When Restoration of Power Occurs while the Control Power (Power Supply to the Control Board) is Maintained
shows an example with this configuration:
The drive starts deceleration through KEB operation. The drive decelerates for the time set in parameter L2-10, and then measures the DC bus voltage level. When the DC bus voltage is lower than the level set in L2-11, the drive uses the KEB Ride-Thru function to continue deceleration. When the DC bus voltage is more than the level set in L2-11, usual operation continues. The drive accelerates the motor to the frequency reference value before the power loss, and usual operation continues.
Figure 3. Cancel KEB Operation without Using the KEB Ride-Thru if Restoration of Power Occurs while the Control Power (Power Supply to the Control Board) is Maintained
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Use the KEB Ride-Thru to Cancel KEB Operation when Restoration of Power Occurs while the Control Power (Power Supply to the Control Board) is Maintained
shows an example with this configuration:
The drive starts deceleration through KEB operation. When the motor decelerates for the time set in L2-10, the drive measures the DC bus voltage and the status of the digital input set for KEB Ride-Thru. When the DC bus voltage is less than the level set in L2-11, or if the digital input set to KEB Ride-Thru is active, deceleration continues. When the DC bus voltage is more than the level set in L2-11, the drive ends KEB operation. The drive accelerates the motor to the frequency reference value before the power loss, and usual operation continues. When the KEB Ride-Thru continues to be input after the time set in L2-02 is expired, the drive uses the KEB Ride-Thru function to continue to decelerate. When you cancel the KEB Ride-Thru, the motor accelerates again, and usual operation continues.
Figure 4. Use the KEB Ride-Thru to Cancel KEB Operation when Restoration of Power Occurs while the Control Power (Power Supply to the Control Board) is Maintained
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KEB Operation when L2-01 = 5 [Kinetic Energy Backup: DecelStop]
The drive starts deceleration through KEB operation. If you do not input the Run command, the motor cannot restart. The drive will continue to decelerate until the motor comes to the minimum output frequency or a complete stop. If you return power during deceleration, the drive continues to decelerate.
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When L2-07 = 0.00 [Kinetic Energy Backup Accel Time = 0.00 s], the drive accelerates again as specified by the applicable Acceleration Time [C1-01, C1-03, C1-05, C1-07], and usual operation continues.
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When L2-07 = 0.00, the drive accelerates again as specified by the applicable Acceleration Time [C1-01, C1-03, C1-05, C1-07], and usual operation continues.
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When L2-07 = 0.00 s, the drive accelerates again as specified by the applicable Acceleration Time [C1-01, C1-03, C1-05, C1-07], and usual operation continues.