Encoder Power Supply For Ssi Encoders - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

3 Motor Selection, Position/Speed Sensing
3.4 Direct position sensing
3.4.3

Encoder power supply for SSI encoders

General
information
What has to be
observed?
3-74
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.
S
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.
S
The external 24 V power supply must have "safe separation" (PELV).
S
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
S
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.
S
Maximum cable length between the 24 V supply and the filter v 10 m
S
Maximum encoder cable = 40 m
S
The technical data of the encoder manufacturer must be carefully observed.
S
Third–party encoders must be connected using the adapter cables provided
by the particular manufacturer.
Filter
6SN1161–1DA00–0AA0
Power supply cables l  20 cm
Fig. 3-7 Connecting SSI encoders to SIMODRIVE 611
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
0.8 A
Z
6FX8002–2CC80–.../OEM l
SSI
SIMODRIVE 611
encoder
© Siemens AG 2012 All Rights Reserved
02.07
05.01
L +
24 V
DC
L–
e.g. at terminal X131
of the NE module
v
40 m