SEW-Eurodrive MOVISAFE DCS B Series

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Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
5
Connecting the position and velocity sensors
Installation
Position
processing
• If position processing is enabled, at least one of the two encoder signals must come
from an SSI absolute encoder. If you provide the DCS..B option with only one SSI
absolute value, then it has to be assigned to "encoder 2".
• When using SSI absolute encoders it is important that velocities are calculated from
the position signals. For this purpose, the encoder must have the respective resolu-
tion and reproducibility of the accuracy.
Process and
diagnostic sensor
• In the DCS..B option, the two encoders are distinguished as process sensor and
reference sensor. The process sensor is primarily used for all calculations. For infor-
mation on which encoder is the process or reference sensor, refer to the "Encoder
combinations" chapter.
• One encoder signal has the function of a process sensor, the other one the function
of a reference sensor. The process sensor, i.e. usually "encoder 1" is used for all
calculations in the DCS..B option.
• If position processing is used in the DCS..B option, "encoder 2" will be the process
sensor. An exception is the combination with two SSI absolute encoders. In this
case, "encoder 1" is the process sensor.
• During operation without position processing, the reference and process sensors are
compared cyclically. The reference sensor is adjusted to the process sensor.
Linear:
– Every 2500 mm
– Every 12.5 m
Rotational:
– Every 125 revolutions
Not possible in combination with two SSI absolute encoders.
Encoder 1 Encoder 2 Safe speed Safe direction Safe
absolute
position
Remark
Backplane bus inc. TTL incremental X 1-encoder system
Backplane bus inc. TTL 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 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
TTL incremental SIN/COS X X
TTL incremental SSI absolute X X X
TTL incremental Backplane bus abs. X X X
SSI absolute TTL incremental X X
SSI absolute SIN/COS X X
SSI absolute SSI absolute X X X 2-encoder system
SSI absolute Backplane bus abs. X X X 2-encoder system