Lenze 8400 motec - Manual (Page 115)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 115
5 Motor control (MCTRL)
5.7 V/f control (VFCplus + encoder)
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5.7 V/f control (VFCplus + encoder)
This function extension is available from version 02.00.00!
The V/f characteristic control (VFCplus) described above can be operated with a speed feedback.
This has the following advantages:
• Steady-state accuracy of the speed
• Less parameterisation effort compared to the sensorless vector control (SLVC)
• Improved dynamics compared to V/f characteristic control without feedback or to sensorless
vector control (SLVC).
• Suitability for group drives

The descriptions in chapter " V/f characteristic control (VFCplus) " also apply to the V/f
control. ( 96)

Note!
• The speed feedback mandatory for this motor control type can be fed in at the digital
input terminals (DI1/DI2) via an HTL encoder.
• In order that the HTL encoder can be evaluated correctly, the digital input terminals
(DI1/DI2) must be configured as frequency inputs.  Configuring DI1 and DI2 as
frequency inputs ( 185)
• Make sure that the maximum input frequency of 10 kHz is not exceeded when the
motor control with speed feedback is used.
• As the slip is calculated in the feedback V/f operation and injected through the slip
regulator, the slip compensation ( C00021 ) is deactivated with V/f control.