BONFIGLIOLI ACTIVE Cube ACU 201-01, Operating Instructions Manual

Page: 137 / 292

12.1.2 Flux Formation
Field-oriented control in the configurations 2xx and 4xx are based on separate regu-
lation of the flux-forming and torque-forming current components. Upon startup, the
machine is magnetized and a current is impressed first. With the parameter
Current
during flux formation
781 the magnetization current I
sd
is set, with the parameter
Maximum Flux-Formation Time
780 the maximum time for the current impression is
set.
The current impression is done until the reference value of the rated magnetizing
current is reached or the
Maximum Flux-Formation Time
780 is exceeded.
Parameter Settings
No. Description Min. Max. Fact. sett.
780 Maximum Flux-Formation Time 1 ms 10000 ms
300 ms
1)
1000 ms
2)
50 ms
3)
781 Current during flux formation 0.1 ⋅ I
FUN
ü ⋅ I
FUN
I
FUN
The factory setting of parameter
Maximum Flux Formation Time
780 depends on
the setting of parameter
Configuration
30:
1)
-
configurations 1xx
2)
-
configurations 2xx/4xx
3)
-
configurations 6xx
The magnetizing current changes according to the rotor time constant of the motor.
By setting the parameters
Max. Flux-Formation Time
780 and
Min. Flux-Formation
Time
779 a constant flux formation time can be achieved. With parameter
Min. Flux-
Formation Time
779 the minimum time for flux-forming current can be set. This
enables a defined time between start signal and run-up of the drive. For an optimum
setting of the parameters the rotor time constant, the required starting torque and
Current during Flux-Formation
781 have to be considered.
Parameter Settings
No. Description Min. Max. Fact. sett.
779 Min. Flux-Formation Time 1 ms 10000 ms
10 ms
1)
50 ms
2)
The factory setting of parameter
Min. Flux-Formation Time
779 depends on the
setting of parameter
Configuration
30:
2)
-
configurations 2xx/4xx
3)
-
configurations 6xx
Min. Flux-Formation Time
779 = 0 Flux-forming ends when
− reference flux value is reached or
− after flux-formation time
Min. Flux-Formation Time
779 > 0 The current for flux-forming is impressed at
least for this time, even if the reference flux
value is reached.
Min. Flux-Formation Time
779 =
Max. Flux-Formation Time
780
Flux-forming ends after flux-formation time,
even if the reference flux value is not
reached.
Min. Flux-Formation Time
779 >
Max. Flux-Formation Time
780
Flux-forming ends after maximum flux-
formation time.
06/13 Operating Instructions ACU 137