YASKAWA iQpump Series Programming Manual page 100

L2-04 Momentary Power Loss Voltage Recovery Ramp Time
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Setting Range: 0.0 to 5.0 sec
Factory Default: Model Dependent
When momentary power loss recovery is enabled (L2-01≠0), a speed search is executed to catch the potentially spinning motor shaft. As
part of the speed search function full voltage is not immediately applied to the motor but is ramped up. The setting of parameter L2-04
determines the ramp time for increasing the output voltage from zero to maximum voltage (E1-05).
If a UV1 fault occurs during the current detection speed search function, increase the setting of L2-04.
L2-05 Undervoltage Detection Level
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Setting Range: 150 to 210 Vdc
Factory Default: 190 Vdc
The L2-05 parameter sets the DC Bus undervoltage level. The setting of L2-05 affects the voltage at which a UV alarm or a UV1 fault
will occur. If the setting of L2-05 is lowered below the factory default level (190 Vdc for a 240 Vac drive and 380 Vdc for a 480 Vac
drive), then an AC Input Reactor must be installed on the input AC line to prevent inrush current from damaging the Drive's input diodes.
An AC Line dip and fast voltage recovery can potentially cause a large inrush current.
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YASKAWA TM.iQp.02 iQpump Drive Programming Manual