BONFIGLIOLI Act 201 Operating Instructions Manual page 98

In contrast to field-oriented control systems, sensor-less control systems feature a
current controller which controls the starting behavior. The PI controller checks the
current impression by parameter
ing parts of current controller can be adjusted via parameters
Integral Time
the parameters to 0.
No.
621 Amplification
622 Integral Time
96
96
Operation mode
Magnetization +
3 -
IxR compensation
Magnetization +
4 - current imp. + IxR
compensation
Magnetization +
12 - current imp. w.
ramp stop
Magnetization +
14 - current imp. w. r.
+ IxR comp.
622, respectively. The control functions can be deactivated by setting
Parameter
Description
Operating Instructions ACTIVE
Operating Instructions ACTIVE
Starting Behavior
Operation mode 3 includes operation mode 1 of the start
function. When the output frequency reaches the value
Frequency Limit
set with parameter
the output voltage by the IxR compensation becomes
effective. The V/f characteristic is displaced by the portion
of voltage which depends on the stator resistance.
In this operation mode, the current set with the parame-
Current during Flux-Formation
ter
the motor for magnetization after release. The output
frequency is kept at zero Hz for the
Formation Time
780. After the time has elapsed, the
output frequency is increased according to the set accel-
eration. If the output frequency reaches the value set
Frequency Limit
with the parameter
Current
623 is withdrawn. There is a smooth transition
to the V/f characteristic, and a load-dependent output
current is obtained. At the same time, the increase of the
output voltage by the IxR compensation becomes effec-
tive as from this output frequency. The V/f characteristic
is displaced by the portion of voltage which depends on
the stator resistance.
Operation mode 12 contains an additional function to
guarantee a starting behavior under heavy duty condi-
tions. The magnetization and starting current impression
are done according to operation mode 2. The ramp stop
takes the current consumption of the motor at the corre-
sponding operating point into account and controls the
frequency and voltage change by stopping the ramp. The
Controller Status
275 signals the intervention of the con-
troller by displaying the message "RSTP".
In this operation mode, the functions of operation mode
12 are extended by the compensation of the voltage drop
across the stator resistance. When the output frequency
reaches the value set with parameter
624, the increase of the output voltage by the IxR com-
pensation becomes effective. The V/f characteristic is
displaced by the portion of voltage which depends on the
stator resistance.
Starting Current
623. The proportional and integrat-
Min.
0.01
1 ms
624, the increase of
781 is impressed into
Maximum Flux-
Starting
624, the
Frequency Limit
Amplification
621 and
Settings
Max. Fact. sett.
10.00 1.00
30000 ms 50 ms
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