V/F Ride-Through - WEG CFW-11 Programming Manual

12.7.3 V/f Ride-Through

The Ride-Through function in the V/f mode will disable the output pulses (IGBT) of the inverter as soon as the
input voltage reaches a value below the undervoltage level. The undervoltage fault (F021) does not occur and
the DC link voltage will decrease slowly until the line voltage returns.
If the line takes too long to return (more than 2 seconds), the inverter may indicate F021 (DC Link Undervoltage).
If the line voltage returns before a fault, the inverter will enable the pulses again, imposing the speed reference
instantaneously (as in the Flying Start function) and applying a voltage ramp with the time defined by P0331.
Refer to the figures 12.7(a) and (b).
Line Returns
P0332
Enabled
Disabled
(a) with the line returning before the time adjusted in P0332
The actuation of the Ride-Through function can be visualized at the outputs DO1/RL1, DO2/RL2, DO3/RL3,
DO4 and/or DO5 (P0275 to P0279), provided that they have been programmed in "24=Ride-Through".
P0331 – Voltage Ramp
Adjustable 0.2 to 60.0 s
Range:
Properties: V/f and VVW
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DC Link Voltage
F021 Level
Output Pulses
P0331
Output Voltage
0 V
Output Speed
(P0002)
0 rpm
Figure 12.7 (a) and (b) - Ride-Through actuation in V/f mode
44 FlyStart/RideThru
Functions Common to All the Control Modes
Line Returns
Enabled
P0332
P0331
Disabled
(b) with the line returning after the time adjusted in P0332, but
before 2 s (for P0332 ≤ 1 s), or before 2 x P0332
(for P0332 > 1 s)
DC Link Voltage
F021 Level
Output Pulses
Time adjusted in P0332
Output Voltage
0 V
Output Speed (P0002)
0 rpm
Factory 2.0 s
Setting:
12-15
12