Nord Drivesystems NORDAC FLEX SK 200E Series User Manual page 101

control fans, certain types of pump drives or agitators. Operation according to a V/f characteristic
curve is activated via parameters (P211) and (P212) (each set to "0").
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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).
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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).
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BU 0200 en-3118
4 Commissioning
101