Flying Start / Ride-Through - WEG CFW100 Programming Manual

Functions Common to All the Control Modes
P135 – Maximum Output Current
Adjustable
Range:
Properties:
Description:
Current level to activate the current limitation for the Ramp Hold and Decelerate Ramp modes, as per
11.5 on page 11-6
P135 > 1.9xI .
nom
11

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 assume the special case in which the motor is spinning in the same direction and at a frequency
close to the frequency reference, thus, by immediately applying the frequency reference to the output and increasing
the output voltage in ramp, the slip and the starting torque are minimized.
11-6 | CFW100
0.0 to 10.0 A
(a) and (b), respectively. In order to disable the current limitation, you must set parameter
Motor current
P135
Output
frequency
Ramp
acceleration
(P100)
During
Acceleration
Motor current
P135
Output
frequency
It decelerates
by emergency
(b) "Ramp Deceleration"
Figure 11.5: (a) and (b) Actuation modes of Current Limitation via P135
Motor current
P135
Output
frequency
Ramp
deceleration
(P101)
Time
Deceleration
(a) "Ramp Hold"
Time
ramp
Time
Return Advance
Factory 1.5 x I
nom
Setting:
Figure
Time
Time