12.8 L: PROTECTION
744 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
• KEB Ride-Thru 1 set for the MFDI terminal becomes enabled (terminal is deactivated when H1-xx = 40 or
terminal is activated when H1-xx = 41).
The drive uses the mode selected L2-29 [KEB Method] to start KEB operation.
• KEB Ride-Thru 2 set for the MFDI terminal becomes enabled (terminal is deactivated when H1-xx = 42 or
terminal is activated when H1-xx = 43).
The drive automatically starts Single KEB Ride-Thru 2 and it ignores the setting of L2-29.
• The DC bus voltage is less than the level set in L2-05 [RidThruMode@PwrLoss].
The KEB operation will start as specified in L2-29.
Note:
If you try to set KEB Ride-Thru 1 and 2 to the MFDI terminals at the same time, it will trigger oPE03 [Multi-Function Input Setting
Err].
In this example, the drive detects that the DC bus voltage is less than the level set in L2-05 and starts the KEB
operation. When you return power during KEB operation, the drive will continue KEB operation when the KEB
Ride-Thru is input, although the time set in L2-10 [Minimum KEB Time] expired. The motor accelerates again
after you cancel the KEB Ride-Thru.
Figure 12.120 KEB Operation through KEB Ride-Thru Input
■ KEB Ride-Thru End Detection
Parameter L2-01 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
Figure 12.121 shows an example that uses this configuration:
• L2-01 = 1 [RideThru@PwrLoss = Enabled] and L2-50 = 2 [RidThruMode@PwrLoss = KEB Mode].
• KEB Ride-Thru is not used.
The drive starts deceleration through KEB operation. The drive stops the 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 [RideThrough Time@Power Loss], the drive
detects Uv1 [DC Bus Undervoltage] and the drive turns off its output.
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