Indirect Position Sensing - Siemens SIMODRIVE 611 Planning Manual

05.01
2.4.2

Indirect position sensing

Measuring
systems which can
S
be evaluated
S
Analog
The controls are equipped, as standard with the connection for the measuring
system system integrated in the feed and main spindle motors.
An HGL module (option) is available to condition position sensing signals from
the 1PH motor directly coupled to the spindle (built–in motor). Signals can be
derived from the motor signal using pulse multiplication for use in the CNC
position measuring circuit. These signals have a resolution of up to:
90,000 increments/revolution, e.g. C–axis quality for feed operation
2048 increments/revolution, e.g. for the "thread cutting" function
SIMODRIVE 611
For the digital coupling between SINUMERIK 810D/840D/840C and SIMO-
digital/universal DRIVE 611, the measuring system is connected to the digital control modules.
The controls are, as standard, equipped with the connection for the measuring
system integrated in the feed and main spindle motors. In conjunction with the
high–resolution position sensing of the digital signal control, with the integrated
motor measuring system, a resolution of 4,000,000 increments per revolution is
achieved (Performance control). This means that it is not necessary to use an
additional C–axis encoder even for the main spindle. The high–resolution posi-
tion actual value is additionally made available to CNC position control loops via
the drive bus. This means, that for the appropriate mechanical arrangement, it is
not necessary to use a direct table measuring system. The same secondary
conditions apply for SIMODRIVE 611 universal and POSMO SI/CD/CA. The
drive coupling is different, which is realized via PROFIBUS.
 Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
2.4 Position sensing/speed actual value sensing
Incremental, integrated encoders in the feed and main spindle motors
Absolute integrated encoder with EnDat interface in the feed motors
2 System Configuration
2-29
2