Parameter Details
2
2.9 L: Protection Functions
YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING 365
■ KEB Ride Thru Start
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 2.103 KEB Operation through KEB Ride-Thru Input
■ KEB Ride-Thru End Detection
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:
• L2-01 = 3 [Kinetic Energy Backup: L2-02] is set.
• KEB Ride-Thru is not used.
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.
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