Flying-Start / Ride-Through; Flying Start Function - WEG CFW501 V1.8X Programming Manual

11.3 FLYING-START / RIDE-THROUGH

The Flying Start function allows driving a motor that is in free spinning, accelerating it from the rotation in which
it is. The Ride-Through function allows recovering the inverter, with no locking by undervoltage, when there is an
instant drop in the power supply.
Both functions have as a premise the special case in which the motor is spinning in the same direction and at
a speed close to the speed reference, and, thus, immediately applying to the output the speed reference and
increasing the output voltage in ramp, the slip and the starting torque are minimized.
P0320 – Flying Start (FS) / Ride Through (RT)
Adjustable 0 = Inactive
Range:
1 = Flying Start
2 = Flying Start / Ride-Through
3 = Ride-Through
Properties: cfg
Description:
Parameter P0320 selects the use of the Flying Start and Ride-Through functions. More details in the following
sections.
P0331 – Voltage Ramp for FS and RT
Adjustable
0.2 to 60.0 s
Range:
Description:
This parameter determines the rising time of the output voltage during the execution of the Flying Start and
Ride-Through functions.

11.3.1 Flying Start Function

In order to activate this function, just program P0320 in 1 or 2; thus the inverter will impose a fixed frequency at
the start, defined by the speed reference, and apply the voltage ramp defined in parameter P0331. In this way,
the start current is reduced. On the other hand, if the motor is at rest, the speed reference and the real speed of
the motor are very different or the direction of rotation is inverted; the result in such cases may be worse than the
conventional start without Flying Start.
The Flying Start function is applied on loads with high inertia or systems that require start with the motor
spinning. Besides, the function may be deactivated dynamically by a digital input P0263 to P0270 programmed
for "15 = Disable Flying Start". In this way, the user may activate the function in a convenient way according to
the application.
Functions Common to all the Control Modes
Factory 0
Setting:
Factory
2.0 s
Setting:
CFW501 | 11-9
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