•
A shor
t-circuit or cross-circuit on one or more channels of the static control inputs
can cause the wrong monitoring case to be activated.
°
Some safety controllers detect the short-circuit or cross-circuit and switch off
the outputs concerned or all their outputs.
°
Due to the short-circuit or cross-circuit, one or more input channels of the
safety laser scanner can nevertheless deliver the HIGH signal level. This may
result in a valid input signal so that a monitoring case is activated.
°
For this reason, laying the cables for the input signals in a protected manner
is recommended. Otherwise, setting the switch-on delay to 0 s and activating
sequence monitoring is recommended. Carrying out regular thorough checks
at short intervals is also recommended.
Further topics
•
"Se
ttings for monitoring case tables", page 135
•
"Configure switching sequence", page 136
4.4.5.2 Dynamic control inputs
Overview
A d
ynamic control input receives speed information from an incremental encoder.
Important information
WARNING
F
ailure of both encoders due to a common cause
If both encoders fail at the same time, the device will receive no speed information.
Therefore, the device switches to the monitoring case defined for standstill, although
the vehicle may be moving.
b
Exclude faults with a common cause in the encoders.
Prerequisites
•
D
efects of an incremental encoder are detected. Therefore, 2 incremental encod‐
ers are used which function independently of one another and transmit their
signals on separate pathways.
•
Only a single safety laser scanner is connected to each incremental encoder.
•
Each incremental encoder (with one wire each for 0° and 90°) is connected to
only one control input.
•
The voltage supply for the incremental encoders is provided by the safety laser
scanner. Each incremental encoder is supplied with voltage from the connection at
which the associated dynamic input is located.
•
The connecting cable of each incremental encoder is routed in its own sheathed
cable.
Incremental encoder
Eac
h incremental encoder must have a 0° output and a 90° output so that the
direction of travel can be detected.
Requirements for incremental encoders:
•
Dual-channel encoder with 90° phase separation
•
Supply voltage: 24 V DC
•
Outputs: Push-pull
•
Enclosure rating: IP54 or better
•
Shielded cable
•
Max. pulse frequency: 100 kHz
•
Min. number of pulses: 50 pulses per cm
4 P
ROJECT PLANNING
68
O P E R A T I N G I N S T R U C T I O N S | microScan3 Pro I/O 8025424/1ELL/2022-01-21 | SICK
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