Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 745
Figure 12.121 Cancel the KEB Operation after the Momentary Power Loss Ride-Thru Time Is Expired without KEB
Ride-Thru
*1 When L2-07 = 0.00 [KEB 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.
Use the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
Figure 12.122 shows an example that uses this configuration:
• L2-01 = 3.
• Use KEB Ride-Thru 1 [H1-xx = 40, 41] or KEB Ride-Thru 2 [H1-xx = 42, 43].
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 Volt Setpoint] or if the KEB digital input is active,
KEB deceleration continues. If the voltage level is more than the level set in L2-11, it continues usual operation.
The drive accelerates the motor to the frequency reference value used 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 12.122 Use the Momentary Power Loss Ride-Thru Time and KEB Ride-Thru to Cancel KEB Operation
*1 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.
Cancel KEB Operation When Restoration of Power Occurs while the Control Power (Power Supply to the
Control Board) is Maintained
Figure 12.123 shows an example with this configuration:
• L2-01 = 1, and L2-50 = 3 [KEB Stop Mode] is set.
• KEB Ride-Thru is not used.
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.
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