Ride-Through Function; Dc Braking - WEG CFW501 V1.8X Programming Manual

Functions Common to all the Control Modes

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 (F0021) 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 F0021 (undervoltage on the DC link). If the supply voltage returns before, the
inverter will enable the pulses again, imposing the speed reference instantly (like in the Flying Start function) and
making a voltage ramp with time defined by parameter P0331. Refer to
function on page
The Ride-Through function allows recovering the inverter without locking by undervoltage F0021 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 P0302. It is set in percentage (%) of the inverter rated current
considering the motor of power compatible with the inverter.
11
P0299 – DC Braking Time at Start
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
DC braking duration at the start.
11-10 | CFW501
11-10.
Return line
t
desab.
Disabled
Figure 11.7: Actuation of the Ride-Through function
0.0 to 15.0 s
MOTOR
DC link voltage
F021 Level
Enabled
> t
dead
Output pulses
P0331
Output voltage
0 V
Output speed
(P0002)
0 rpm
Figure 11.7: Actuation of the Ride-Through
Factory
Setting:
0.0 s