3
05.01
3.4 Direct position sensing
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© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) -- 05/2008 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.
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 ≤ 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
6SN1 161--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?
Mo
o
Selec
on
Po
on
S
ee
Sen
n
02.07
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