3
05.01
3.4 Direct position sensing
3-74
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 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 connected to the
encoder cable.
The following must be observed (refer to Fig. 3-7):
Note
SSI encoders are likely to have lower noise immunity due to the encoder and
the 24 V power supply.
The encoders must be supplied with a separately regulated 24 V voltage
(e.g. SITOP power) in order to avoid disturbances/noise due to contactors, etc.
The external 24 V power supply must have ”safe separation” (PELV).
Filter data:
–
The special filter is required in order to filter–out noise and disturbances
–
Maximum continuous operating current = 0.8 A (use a fuse!)
–
Max. voltage = 30 V
–
One filter is designed for two encoders with a maximum current = 0.4 A
The 24 V supply (reference potential) should be connected to the electronics
ground of the system (e.g. terminal X131 on the NE module) if this connec-
tion is not already provided in the encoder.
Maximum cable length between the 24 V supply and the filter
10 m
Maximum encoder cable = 40 m
The technical data of the encoder manufacturer must be carefully observed.
Third–party encoders must be connected using the adapter cables provided
by the particular manufacturer.
Filter
6SN1161–1DA00–0AA0
6FX8002–2CC80–.../OEM l
40 m
Power supply cables l
20 cm
0.8 A
24 V
DC
L–
e.g. at terminal X131
of the NE module
L +
SSI
encoder
SIMODRIVE 611
Fig. 3-7
Connecting SSI encoders to SIMODRIVE 611
General
information
What has to be
observed?
3 Motor Selection, Position/Speed Sensing
02.07
