8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
V/f characteristic control (VFCplus)
112 L Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010
5.4 V/f characteristic control (VFCplus)
In case of the V/f characteristic control (VFCplus), the motor voltage of the inverter is
determined by means of a linear or quadratic characteristic depending on the field
frequency or motor speed to be generated. The voltage follows a preselected characteristic.
Stop!
• The following must be observed when operating drives with quadratic V/f
characteristic:
– Please always check whether the corresponding drive is suitable for
operation with a quadratic V/f characteristic!
– If your pump drive or fan drive is not suitable for operation with a quadratic
V/f characteristic, you must use either use the V/f characteristic control
function with a linear V/f characteristic or the SLVC operating mode
(sensorless vector control), respectively SC (servo control).
• For adjustment, observe the thermal performance of the connected
asynchronous motor at low output frequencies.
– Usually, standard asynchronous motors with insulation class B can be
operated for a short time with their rated current in the frequency range 0
Hz ≤ f ≤ 25 Hz.
– Contact the motor manufacturer to get the exact setting values for the
max. permissible motor current of self-ventilated motors in the lower
speed range.
– If you select the quadratic V/f characteristic, we recommend to set a lower
V
min
.
• The nameplate data of the motor (at least rated speed and rated frequency)
must be entered if, instead of a standard motor, an asynchronous motor is
used with the following values:
– rated frequency ≠ 50 Hz (star) or
– rated frequency ≠ 87 Hz (delta) or
– number of pole pairs ≠ 2
efesotomasyon.com - Lenze
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