4 Commissioning
BU 0505 EN-3021 87
2. CFC closed-loop mode (P300, setting "1")
In contrast to the "0" setting "VFC open-loop mode" this is a form of control with current controlled
flux orientation (Current Flux Control). For this operating mode, which for ASMs is functionally
identical to the previously used designation "servo control", use of an encoder is essential. The
precise speed behaviour of the motor is detected and included in the calculation for control of the
motor. Determination of the position of the rotor is also possible through the use of the encoder,
whereby the initial value of the rotor position must also be determined for the operation of a PMSM.
This enables even more precise and rapid control of the drive unit.
This operating mode provides the best possible results for the control behaviour of both ASMs and
PMSMs and is especially suitable for lifting equipment applications or applications with
requirements for the highest possible dynamic behaviour (ramp times ≥ 0,05 sec). The greatest
advantage of this operating mode is gained in combination with an IE4 motor (energy efficiency,
dynamics, precision).
Pos: 115.5 /Anleitung en/Elektronik/F U und Starter/4. Inbetri ebnahme/Inbetriebn ahme Betriebsarten M otorregler (P300) [ SK 1x0E, SK 2xxE]/Er läuterung der Betriebsarten ( P300)_03 [SK 1x0E, SK 2xxE , SK 5xxE] @ 8\mod_1441288721267_3 88.docx @ 239804 @ @ 1
3. CFC open-loop –mode (P300, setting "2")
CFC mode is also possible with the open-loop method, i.e. in operation without an encoder. Here,
the speed and position detection are determined by "observation" of measurements and setting
values. Precise setting of the current and speed controller is also essential for this operating mode.
This mode is especially suitable for applications with higher demands for dynamics in comparison
with VFC control (ramp times ≥ 0.25 s) and e.g. also for pump applications with high starting
torques).
Pos: 115.6 /Anleitung en/Elektronik/F U und Starter/4. Inbetr iebnahme/Auswahl Motor regelverfahren/ Parameterübersic ht Reglereinstellung [ SK 2xxE, SK 5xxE] @ 6\mod_1421067 020960_388.doc x @ 198341 @ 3 @ 1
4.2.2 Overview of control parameter settings
The following provides an overview of all parameters which are of importance, depending on the
selected operating mode. Among other things, a distinction is made between "relevant" and
"important", which provides an indication of the required precision of the particular parameter setting.
However, in principle, the more precisely the setting is made, the more exact the control, so that
higher values for dynamics and precision are possible for the operation of the drive unit. A detailed
description of these parameters can be found in Section 5 "Parameters".
"Ø" = Parameter has no significance "-" = Leave the parameter in the factory setting
Setting of the parameter is relevant
Setting of the parameter is important
Group Parameter Operating mode
VFC open-loop CFC open-loop CFC closed-loop
ASMs PMSMs ASMs PMSMs ASMs PMSMs
Motor data
2)
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