Operating Instructions ACTIVE06/07 95
06/07 Operating Instructions ACTIVE 95
11 Operational Behavior
The operational behavior of the frequency inverter can be adjusted to the application
by setting the parameters appropriately. In particular the starting and stopping behav-
ior can be selected according to the selected
Configuration 30. Additionally, features
such as Auto Start, synchronization and positioning functions facilitate the integration
in the application.
11.1 Starting Behavior
The start of the 3-phase machine can be parameterized in accordance with the control
functions and methods. In contrast to the sensor-less control method, the field-
oriented control methods only require the definition of the limit values
Max. Flux For-
mation Time
780 and Current during Flux Formation 781 for the adjustment of the
starting behavior. The acceleration behavior of the sensor-less control method in con-
figurations 110 and 111 can be selected as described in the following chapter.
11.1.1 Starting Behavior of Sensorless Control System
The parameter
Operation Mode 620 for the starting behavior is available in configu-
rations 110 and 111. Depending on the operation mode selected, the machine is mag-
netized first or a starting current is impressed. The voltage drop across the stator
resistance which reduces the torque in the lower frequency range can be compen-
sated by the IxR compensation.
To ensure the correct function of the IxR compensation, the stator resistance is de-
termined during the guided commissioning. The IxR compensation is only activated
after the stator resistance was determined correctly.
Operation Mode 620 Starting Behavior
0 - Off
At the start the voltage with the th value of parameter
Starting Voltage 600 is set at an output frequency of
0 Hz. After this, the output voltage and the output fre-
quency are changed according to the control method.
The break-away torque and the current at the start is
determined by the adjusted starting voltage. It may be
necessary to optimize the starting behavior via the pa-
rameter
Starting Voltage 600.
1 - Magnetization
In this operation mode, the
Current during Flux-
Formation
781 for magnetization is impressed into the
motor after release. The output frequency is kept at zero
Hz for the
Maximum Flux-Formation Time 780. After
this time has expired, the output frequency follows the
adjusted V/f characteristic. (see operation mode 0- Off)
2 -
Magnetization +
current impression
Operation mode 2 includes operation mode 1. After the
Maximum Flux-Formation Time 780 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 1.4 times the frequency limit to the set V/f characteris-
tic. As from this operating point, the output current de-
pends on the load.
Table "Operation Modes for Starting Behavior" continued on next page.
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