Operating Instructions ACTIVE 06/0796
96 Operating Instructions ACTIVE 06/07
Operation mode Starting Behavior
3 -
Magnetization +
IxR compensation
Operation mode 3 includes operation mode 1 of the start
function. When the output frequency reaches the value
set with parameter
Frequency Limit 624, the increase of
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.
4 -
Magnetization +
current imp. + IxR
compensation
In this operation mode, the current set with the parame-
ter
Current during Flux-Formation 781 is impressed into
the motor for magnetization after release. The output
frequency is kept at zero Hz for the
Maximum Flux-
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
with the parameter
Frequency Limit 624, the Starting
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623 is withdrawn.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.
12 -
Magnetization +
current imp. w.
ramp stop
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“.
14 -
Magnetization +
current imp. w. r.
+ IxR comp.
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
Frequency Limit
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.
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
Starting Current 623. The proportional and integrat-
ing parts of current controller can be adjusted via parameters
Amplification 621 and
Integral Time 622, respectively. The control functions can be deactivated by setting
the parameters to 0.
Parameter Settings
No. Description Min. Max. Fact. sett.
621 Amplification 0.01 10.00 1.00
622 Integral Time 1 ms 30000 ms 50 ms
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