Lenze 8400 User Manual

Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 185
5 Motor control (MCTRL)
5.6 V/f control (VFCplus + encoder)
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5.6 V/f control (VFCplus + encoder)
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
 Stop!
The V/f control requires a speed feedback!
• The speed sensor used has to be set in C00495
. This setting is not made automatically
with the selection of the motor from the »Engineer« motor catalogue!
•If no
speed sensor is set in C00495 and the controller is enabled, an impermissibly
high motor current occurs which may destroy the motor thermally!
• From version 14.00.00, the error response set in C00571/2
(Lenze setting: "Fault")
takes place if in case of controller enable it is detected that a motor control type with
feedback is set in C00006
but no speed encoder is set in C00495.
 Stop!
V/f emergency operation
From version 15.00.00 , it is internally switched to the encoderless V/f characteristic
control in case of an encoder open circuit in order to avoid impermissible motor
movements.
• In order that this "V/f emergency operation" works properly, the parameters relevant
for the V/f characteristic control (base frequency, Vmin boost, slip compensation, etc.)
have to be set correctly. As an alternative, a motor parameter identification can be
executed as well.
• The change-over to "V/f emergency operation" is reported via bit 4 in C01000
and via
the bWirebreakUfLinearActive status signal at the SB LS_DeviceMonitor
.
• The change-over to "V/f emergency operation" can be suppressed by setting bit 8 to
"1" in C02864/1
.
 Note!
• Make sure that, when the motor control with speed feedback is in use, the maximum
input frequency of 100 kHz is not exceeded. Using DI1(6) and DI2(7) as frequency
inputs ( 327)
• 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.

Lenze 8400 Specifications

General

Category	DC Drives
Series	8400
Protection class	IP20
Control Type	Vector control
Communication	CANopen, PROFIBUS, Ethernet
Protection Features	Overcurrent, overvoltage, undervoltage, overtemperature
Input Voltage	AC 230/400/480 V