Lenze 8400 TopLine - Manual (Page 226)

5 Motor control (MCTRL)
5.9 Servo control (SC)
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Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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5.9 Servo control (SC)
Field-oriented servo control (SC) is based on a decoupled, separate control of the torque-producing
and the field-producing current component. The motor control is based on a field-oriented,
cascaded controller structure with feedback function and enables dynamic and stable operation in
all of the four quadrants. It can be used for synchronous motors (PSM) and asynchronous motors
(ASM).

Stop!
• Servo 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 .
• We recommend to select a power-adapted combination of inverter and motor.
• The Lenze setting permits the operation of a power-adapted motor. Optimal
operation is only possible if either:
• the motor is selected via the »Engineer« motor catalogue,
• the motor nameplate data are entered and motor parameter identification is
carried out afterwards
- or -
• the nameplate data and equivalent circuit data of the motor are entered manually.
• When you enter the motor nameplate data, take into account the phase connection
implemented for the motor (star or delta connection). Only enter the data applying to
the selected connection type.

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 .
• In case of servo control for synchronous motors (PSM), no change-over to "F/f
emergency operation" takes place.