SEW-Eurodrive MOVISAFE DCS B Series

64
Manual – MOVIDRIVE® MDX61B Safety Module MOVISAFE® DCS..B Option
5
Connecting the position and velocity sensors
Installation
Example:
Sensor system with single- and dual-channel subsystem (e.g. incremental encoder,
single-channel mechanics, dual-channel signal generation). Diagnostics by means of
separate signal processing in two channels and cross comparison in the DCS..B option
(PES) as well as further specific diagnostics.
Depending on the selected encoder type and encoder combination, several diagnostic
measures have been implemented in the DCS..B option to detect faults in the sensor
system. They are activated automatically when selecting the encoder type in the
MOVISAFE
®
Assist/Config software interface. You can use the diagnostic coverage
values for the encoder sensors in chapter "Diagnostic values" for a safety-relevant
evaluation of the overall system.
Observe the following notes:
• The DCS..B option usually supplies the connected sensors with voltage. This voltage
is monitored by a diagnostic process. If the sensors are powered by an external volt-
age supply, you must include the possibility of a voltage supply failure in the error
discussion for the overall system. Particularly with shared external voltage supplies,
you must document that this fault will be detected when the minimum operating volt-
age of the encoder system is not maintained.
• The current consumption of the encoders in use should not exceed DC 300 mA.
When using encoders with higher operating currents, the encoder voltage supply
must be provided separately.
• Observe the notes in chapter "General installation notes for encoders".
• The connected encoders must not impact each other. This refers to both the electri-
cal and mechanical part.
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PES = Programmable electronic system
I
A
= Input channel A
I
B
= Input channel B
L
A
= Logic channel A
L
B
= Logic channel B
O
A
= Output channel A
O
B
= Output channel B
c = Cross comparison
m = Monitoring
S
A
= Sensor 1 channel A
S
B
= Sensor 1 channel B
Sig
A
= Signal track A of the incremental encoder
Sig
B
= Signal track B of the incremental encoder
Sig A
Sig B
S
A
S
B
Sensor
I
A
O
A
L
A
I
B
O
B
L
B
c
PES
m
m