nord NORDAC FLEX SK 200E Series User Manual page 102

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
Operation according to a V/f characteristic curve is only suitable for drive applications with relatively
low demands on the quality of speed control and dynamics (ramp times ≥ 1 s). For machines which
tend to have relatively large mechanical vibrations due to their construction, control according to a
V/f characteristic curve can also be advisable. Typically, V/f characteristic curves are used to
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
field 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 behavior of the motor is detected and included in the calculation for control of the
motor. Determining 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 behavior of both ASMs and
PMSMs and is especially suitable for lifting equipment applications or applications with
requirements for the highest possible dynamic behavior (ramp times ≥ 0.05 s). 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)
The CFC mode is also possible with the open-loop method, i.e. operation without an encoder.
Speed and position here 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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102 BU 0200 en-US-4920