When L2-01 = 3, 4, 5 [Power Loss Ride Through Select = Kinetic Energy Backup: L2-02, Kinetic Energy Backup: CPU Power, Kinetic Energy Backup: DecelStop], the drive starts the KEB operation immediately after it detects a momentary power loss. When one of these conditions occur, the drive will activate KEB Ride-Thru:
-
KEB Ride-Thru 1 set for the MFDI terminal becomes enabled (terminal is deactivated when H1-xx = 65 or terminal is activated when H1-xx = 66).
The drive uses the mode selected L2-29 [Kinetic Energy Backup Method] to start KEB operation.
-
KEB Ride-Thru 2 set for the MFDI terminal becomes enabled (terminal is deactivated when H1-xx = 7A or terminal is activated when H1-xx = 7B).
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 [Undervoltage Detection Lvl (Uv1)].
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].
n 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 1. KEB Operation through KEB Ride-Thru Input
