Inovance MD800 Series - Power Dip Ride-Through Function

Function Applications
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4.6.8 Power Dip Ride-Through Function
The power dip ride-through function enables the system to run continuously at occurrence of
instantaneous power loss. When an instantaneous power loss occurs, the AC drive keeps the motor in
the power generation state to keep the bus voltage at a value around the "Threshold of power dip ride-
through function enabled", preventing the AC drive from stopping due to undervoltage, as shown in
the following figure.
Figure 4-66 Power dip ride-through
In the bus voltage constant control mode, when line voltage recovers, the AC drive output frequency
increases gradually to the target frequency based on the acceleration time. In the decelerate to stop
mode, when the line voltage recovers, the AC drive decelerates to 0 Hz and stops. The AC drive will
start again only when a new startup command is received.