3
05.01
3.4 Direct position sensing
3-64
Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
3.4.3 Encoder power supply for SSI encoders
For SIMODRIVE, an internal 5 V is provided to supply encoders. When using
SSI encoders, the power supply voltage must be externally fed–into the enco-
der cable.
The following must be observed (refer to Fig. 3-8):
S The encoders should be supplied with a separate regulated 24 V voltage
(e.g. SITOP power), in order to prevent disturbances caused by contactors
etc.
S The external 24 V power supply must have protective separation (PELV).
S Filter data:
– The special filter is required to filter out noise
– Max. continuous operating current = 0.8 A (use a fuse!)
– Max. voltage = 30 V
– 1 filter is designed for 2 encoders with max. current = 0.4 A
S The 24 V supply (reference potential) should be connected to the electronics
ground of the system (e.g. terminal X131 at the NE module) if this connec-
tion is not already provided in the encoder.
S Max. cable length between the 24 V supply and filter = 9.9 m
S Max. encoder cable length = 50 m
S The technical data of the encoder manufacturer must be observed.
Filter
6SN1161–1DA00–0AA0
6FX8002–2CC80–... l 50m
Power supply cables I 20cm
0.8 A
24 V
DC
L–
e.g. at terminal X131
of the NE module
L+
SSI
encoders
Z
SIMODRIVE
611
Fig. 3-8 Connecting SSI encoders to SIMODRIVE 611
General
information
What has to be
observed?
3 Motor Selection, Position/Speed Sensing
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