V/F Flying Start; Vector Flying Start; P0202=3 - WEG CFW-11 Programming Manual

Functions Common to All the Control Modes

12.7.1 V/f flying Start

In the V/f mode, the inverter imposes a fixed frequency at the start, defined by the speed reference, and applies a
voltage ramp defined at the parameter P0331. The Flying Start function will be activated after the time adjusted
in P0332 elapses (to allow the motor demagnetization), every time a "Run" command is driven.

12.7.2 Vector flying Start

12.7.2.1 P0202=3

In the Sensorless vector mode, the Flying Start initiates soon after the "Run/Stop=Run" command is applied. At
this moment the inverter initiates a sweep (search) using I/f scalar control, where I is constant and f varies from
the P0134 value down to zero. The rate of the frequency change is determined by (P0329 x P0412). When the
motor speed is found the control mode is changed from I/f to vector sensorless, and the motor is driven to the
speed reference indicated in P0001.
The used parameters are P0327 to P0329 and the not used ones are P0182, P0331 and P0332.
Note!
When the general enable command is activated, the motor magnetization will not occur.
Note!
For a better performance of the function, the activation of the braking without losses is recommended
by setting the parameter P0185 according to the table 11.9.
P0327 – f.S. current Ramp i/f
Adjustable
Range:
Description:
It defines the time for the I/f current to change from 0 to the level used in the frequency sweep (f). It is determined
by: P0327=P0412/8.
P0328 – flying Start filter
Adjustable
Range:
Description:
It establishes the time of permanence in the condition that indicates that the speed of the motor was found. It is
defined by: P0328=(P0412/8 + 0.015 s).
P0329 – frequency Ramp i/f f.S.
12
Adjustable
Range:
Proprieties:
Access groups
via HMI:
12-12
0.000 to 1.000 s
0.000 to 1.000 s
2.0 to 50.0
Sless
01 PARAMETER GROUPS
44 FlyStart/RideThru
Factory 0.070 s
Setting:
Factory 0.085 s
Setting:
Factory 6.0
Setting: