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About this document
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Safety information
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Generally applicable notes
8015842/1EF5/2021-12-15 | SICK
Subject to change without notice
SICK encoders are measuring instruments produced in accordance with recognized
industrial regulations.
The installation of the encoder is to be carried out by trained personnel with
b
knowledge of electrical engineering and precision engineering.
The encoder must be used only for the purpose appropriate to its design.
b
CAUTION
•
Observe the professional safety and accident prevention regulations applicable to
your country.
•
Switch off the voltage to all the devices/machines during mounting.
•
Never electrically connect or disconnect the encoder with the voltage switched on,
otherwise this may lead to damage to the encoder.
•
Avoid striking the shaft of the encoder.
•
To ensure reliable operation, high quality ground and shield connections should be
provided. Shield connections should be made at both ends of the encoder cable.
Accurate centering of the encoder reduces the angular offset and shaft offset after the
installation and lowers stress applied to the stator coupling and encoder bearings. To
minimize stress on the stator coupling during the installation, mount the encoder by its
stator coupling first and then fasten the clamping ring on the hollow shaft clamp.
The cable shield is connected to the encoder housing on encoders equipped with
integral cables.
To ensure the signal quality and protect against external interference, a shielded
twisted-pair cable should be used with complementary signals (e.g. A and AN) twisted
in pairs. Consult the relevant table in these instructions for signal allocation informa‐
tion.
To ensure reliable operation, the housing or cable shield should be connected to earth
ground. This can be done by connecting the shield braid or shield drain wire of the
cable to a suitable ground.
We recommend the use of SICK accessory cables, or cables of an equivalent quality.
Information relating to SICK accessory cables can be found in the corresponding data
sheets.
Braided cable shields should be connected over a large area; preferably over its entire
circumference.
OPERATING INSTRUCTIONS
O P E R A T I N G I N S T R U C T I O N S | DFS20, DFS25, DFS21, DFS22
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