Siemens SINUMERIK 840D Description Of Functions page 177

11.03
3.11 Encoder mounting arrangements
Connection
of motor
encoder
(IMS)
Connection
of direct
position
encoder
(DMS)
Fig. 3-44 Motor for a drive subject to slip
Configuring options In the configuration shown in Fig. 3-46 "Configuration of spindle with a drive
subject to slip and two encoders", the SI actual values for the NCK and drive
are derived from one encoder (the motor encoder).
As the actual value of the motor encoder is used for both monitoring channels,
the slip is ignored in this configuration (the same behavior as for 1-encoder
system).
If there is no free actual value input, an additional module must be used.
An actual value input on another drive module must be used for spindle
positioning. This drive may not be an SI axis.
Fig. 3-45
Machine data for The MD values refer to two cases (refer to Fig. 3-46 "Configuration of spindle
840D/611 digital with a drive subject to slip and 2 encoders"):
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Incremental
encoder
Motor
(MSD)
MSD
Drive
1 2 3 4
1)
2)
1)
2)
Configuration of spindle with a drive subject to slip and 2 encoders
3 Safety-Related Functions
Belt drive slip
Indexing
mechanism
Spindle
Incremental
encoder
GEBER_04.DSF
Belt drive slip
Incremental
encoder
Motor
(MSD)
Shift gearbox
Incremental encoder
GEBER_05.DSF
Spindle
3-177