Power Fault Ride-through Setting
Code
Name
Setting range
Default
Min.
Attri.
C0.40 Power loss ride-through mode
0: Inactive
1: Output disabled
2: Regain kinetic energy
3: Regain kinetic energy, de-
celerate to stop
0
–
Stop
When AC power is lost or not stable for a short time, the frequency converter
will enter the power fault ride-through mode as long as the DC-bus voltage is
still maintained stable (1P: DC-bus voltage above 180 V; 3P: DC-bus voltage
above 370 V). The power fault ride-through operation will be decided by the se-
lected option as below:
When option 1 is selected, the frequency converter output will be switched off.
When the power supply resumes, the frequency converter will execute speed
capture and resume its previous operation.
When option 2 is selected, the converter will decrease the output frequency to
regain the kinetic energy from the rotating motor, to stabilized the DC bus volt-
age. When DC bus voltage is recovered, then converter output frequency will
rise again and converter will enter the normal running mode.
When option 3 is selected, the converter regains kinetic energy from the motor
in generator mode with a defined ramp (defined by deceleration time (C0.44)
that is the time from max frequency to 0 Hz). Even when the power supply
comes up again before the kinetic energy is consumed the drive will continue to
decelerate down to stop. When the kinetic energy is consumed and the drive
reaches the power fail voltage level the drive will be shut down.
When option 3 is selected, special care must be taken by configura-
tion of the deceleration time. If the time is too short overvoltage will
occur. If the time is too long undervoltage will occur. For the prob-
lem of overvoltage a braking resistor may help.
EFC x610 Series
Bosch Rexroth AG
Functions and Parameters
DOK-RCON03-EFC-X610***-IT05-EN-P
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