8400 StateLine C | Reference manual
Motor control (MCTRL)
Selecting the control mode
118
L
Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
V/f characteristic control (VFCplus)
The V/f characteristic control (VFCplus) is a motor control mode for standard frequency
inverter applications based on a simple and robust control process which is suitable for the
operation of asynchronous motors with linear or square-law load torque characteristic
(e.g. fans). Furthermore, this motor control mode is also suitable for group drives and
special motors. Due to the low parameterisation effort, commissioning of such
applications is fast and easy.
The V
min
-boost (
C00016
) and slip compensation (
C00021
) required for optimising the drive
behaviour are dimensioned for asynchronous motors with power adaptations to the
inverter in the Lenze setting.
V/f characteristic control (VFCplus)
(
125)
Energy-saving V/f characteristic control (VFCplusEco)
From version 10.00.00
In contrast to the V/f characteristic control mode (VFCplus), this motor control mode uses
a cos
ϕ
control in partial load operational range to automatically reduce the power loss in
the asynchronous motor (energy optimisation).
The motor data required for the cos
ϕ
control and the V
min
boost (
C00016
) and slip
compensation (
C00021
) required for optimising the drive behaviour are dimensioned for
asynchronous motors with power adaptations to the inverter in the Lenze setting.
The required motor data (motor rotor resistance, motor stator resistance, motor stator
leakage inductance and mutual motor inductance) only affect the extent of energy
optimisation but not the stability.
In case of applications with dynamically very high sudden load variations from the
unloaded operation, this motor control mode should not be used since a motor stalling
cannot be excluded.
Energy optimisation for dynamic applications is not possible with this motor control mode.
V/f characteristic control - energy-saving (VFCplusEco)
(
144)
V/f control (V encoder)
The V/f control can be selected for operating asynchronous motors with speed feedback.
With this motor control, a slip regulator can be additionally parameterised which adjusts
the actual speed value dynamically to the speed setpoint.
V/f control (V encoder)
(
154)
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