Operating instructions

Rexroth IndraDrive Commissioning and Parameterization 7-121
DOK-INDRV*-FU*********-IB01-EN-P
Mechanical system Encoder Useful scaling type settings
Motorr Load gear Feed spindle
Motor
encoder
External
encoder
Motor
reference
Load
reference Modulo
rotary available not available rotary no rotary rotary possible
rotary available/
not available
available rotary no rotary --- possible
rotary available/
not available
available rotary no --- linear possible
rotary available not available rotary rotary rotary rotary possible
rotary available/
not available
available rotary rotary rotary --- possible
rotary available/
not available
available rotary rotary --- linear possible
rotary available/
not available
available rotary linear rotary --- possible
rotary available/
not available
available rotary linear --- linear possible
linear not available not available linear --- --- linear not possible
Fig. 7-54: Useful scaling type settings depending on mechanical drive system
and measuring systems
7.5 Voltage-Controlled Operation (Open-Loop U/f Control)
Overview
The drive function "voltage-controlled operation of asynchronous motors
without encoder in open-loop U/f control" is made available in the base
package "open-loop" in the "velocity control" mode. When the expansion
package "synchronization" has been enabled, the operating mode
"velocity synchronization with real/virtual master axis" is additionally
available.
master
oper. mode 2
oper. mode 1
DF000090v01_en.fh7
open-loop drive control
cmd. value adjustment
(depending on oper. mode)
drive controller
open-loop
motor control
(U/f)
- without encoder -
limitation
torque/current
Fig. 7-55: Principle of open-loop U/f control
Open-loop U/f motor control is characterized by the following features or
core functions:
• monitoring and limitation of the maximum stator frequency change
that results from the command velocity change
Features