WEG CFW300 V1.3X, Programming Manual

Page: 88 / 157

Functions Common to All the Control Modes
11-8 | CFW300
11
11.3.2 Ride-Through Function
The Ride-Through function will disable the inverter output pulses (IGBT) as soon as the supply voltage reaches a
value below the undervoltage value. A fault due to undervoltage (F021) does not occur and the DC link voltage will
slowly drop until the supply voltage returns. In case it takes the supply voltage too long to return (over 2 seconds),
the inverter may indicate F021 (undervoltage on the DC link). If the supply voltage returns before, the inverter will
enable the pulses again, imposing the frequency reference instantly (like in the Flying Start function) and making a
voltage ramp with time defined by parameter P331. Refer to
Figure 11.6 on page 11-8 .
DC Link voltage
Level F021
Output pulses
t
disab.
> t
dead
Enabled
Disabled
Return line
Output voltage
0 V
0 Hz
Output frequency
(P002)
P331
Figure 11.6: Actuation of the Ride-Through function
The Ride-Through function allows recovering the inverter without locking by undervoltage F021 for momentary
power supply drops. The time interval accepted during a fault is at most two seconds.
11.4 DC BRAKING
The DC Braking allows stopping the motor by applying direct current to it. The current applied at the DC Braking
is proportional to the braking torque and may be set in P302. It is set in percentage (%) of the inverter rated current
considering the motor of power compatible with the inverter.
P299 - DC Braking Time at Start
Adjustable
Range:
0.0 to 15.0 s
Factory
Setting:
0.0 s
Properties:
Description:
DC braking duration at the start.