Siemens SINAMICS Series Operating Instructions Manual page 223

Parameter
"Zero pulse inactive time"
(before and after A=B=high)
"Zero pulse active time"
(while A=B=high and beyond)
Other signal levels according to the RS422 standard
1)
The absolute level of the individual signals varies between 0 V and V CC of the encoder system.
2)
t is not a specified value, but is the time between the falling edge of track A and the next but one rising edge of
3)
ALo-BHi
track B.
Additional information on setting the "Zero pulse active time" can be found in the Function Manual: /FH1/ SINAMICS
4)
S120, tolerant encoder monitoring for SMC30.
Table 7- 20 Connectable encoders
HTL bipolar 24 V
HTL unipolar 24 V
1)
TTL bipolar 24 V
TTL bipolar 5 V
SSI 24 V/5 V
TTL unipolar
Because the physical transmission properties are more robust, the bipolar connection should always be used. The
1)
unipolar connection should only be used if the encoder type does not output push-pull signals.
A controller compares the encoder system supply voltage - sensed via the Remote Sense cables - with the reference
2)
supply voltage of the encoder system, and adjusts the supply voltage for the encoder system at the output of the drive
module until the required supply voltage is obtained directly at the encoder system (only for 5 V encoder system power
supply).
Maximum encoder cable length
Table 7- 21
Encoder type
TTL
HTL unipolar
HTL bipolar
SSI
For TTL encoders at X520 → Remote Sense → 100 m
1)
Because the physical transmission properties are more robust, the bipolar connection should
2)
always be used. The unipolar connection should only be used if the encoder type does not output
push-pull signals.
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
Designation
t
Lo
t
Hi
4)
X520 X521
(SUB-D) (terminal)
No/yes
No/yes Yes (however, a bipolar
connection is recommended)
Yes
Yes
Yes
Maximum encoder cable length
1)
2)
7.3 Sensor Module Cabinet-Mounted SMC30
Threshold Min.
640
640
X531
(terminal)
Yes
1)
Yes
Yes
Yes
No
Maximum encoder cable length in m
Additional system components
Max.
(t - t )/2
3)
ALo-BHi Hi
t - 2*t
Lo 3)
ALo-BHi
Track Remote Sense
monitoring
No/yes
No
Yes
Yes To X520
No
100
100
300
100
Unit
ns
ns
2)
No
No
No
No
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