SEW-Eurodrive MOVISAFE DCS21B

62
Manual – MOVIDRIVE® MDX61B Safety Module Option MOVISAFE® DCS..B
5
Connecting the position and velocity sensors
Installation
5.10.2 General installation notes for encoders
• Maximum length of encoder cables:
100 m (328 ft) with a capacitance per unit length ≤ 120 nF/km.
• Core cross section: 0.2 – 0.5 mm (AWG24 – AWG21)
• Use shielded cables with twisted pair conductors and make sure they are grounded
on both ends over a large surface area:
– At the encoder in the cable gland or in the encoder plug
– At the inverter in the housing of the D-sub connector, or
– At the metal clamp / strain relief at the bottom of the inverter
• Observe the notes in chapter "Measures for electromagnetic compatibility (EMC)".
5.10.3 Combination of different encoder types
You always have to provide the DCS..B option with two encoder signals. You can con-
nect the encoders directly to the X84 and X85 terminals of the DCS..B option. You can
also use the encoder values of MOVIDRIVE
®
B via the backplane bus. Whether one or
2 encoders are used for monitoring mainly depends on the required performance level
and has to be assessed separately. Furthermore, measures have to be taken against a
possible malfunction of an encoder system if the malfunction can negatively influence
the application (example: position processing with only one SSI absolute encoder). Var-
ious encoder types can be combined depending on the specific application. Observe the
following notes.
If you change the encoder configuration at a later date in the MOVISAFE
®
Assist/Config
software interface, the existing parameters for the monitoring functions might no longer
be compatible with the new encoder configuration. In this case, check the parameter set-
tings and value ranges of all the monitoring functions in use.
Encoder 1 Encoder 2 Safe speed Safe direction Safe
absolute
position
Remark
Backplane bus inc. TTL incremental X 1-encoder system
Backplane bus inc. HTL incremental X 1-encoder system
Backplane bus inc. TTL incremental X X 2-encoder system
Backplane bus inc. HTL incremental X X 2-encoder system
Backplane bus inc. SIN/COS X X 1-encoder system
(via split cable)
Backplane bus inc. SIN/COS X X 2-encoder system
Backplane bus inc. SSI absolute X X X 2-encoder system
SIN/COS TTL incremental X X
SIN/COS HTL incremental X X
SIN/COS SIN/COS X X 2-encoder system
SIN/COS SSI absolute X X X
SIN/COS Backplane bus abs. X X X
TTL incremental TTL incremental X X 2-encoder system
HTL incremental HTL incremental X X 2-encoder system
TTL incremental SIN/COS X X
HTL incremental SIN/COS X X
TTL incremental SSI absolute X X X
HTL incremental SSI absolute X X X
TTL incremental Backplane bus abs. X X X
HTL incremental Backplane bus abs. X X X
SSI absolute TTL incremental X X
SSI absolute HTL incremental X X
SSI absolute SIN/COS X X