Operating instructions

Principles of Rotary Encoders
13
Pepperl+Fuchs Inc. • 1600 Enterprise Parkway • Twinsburg, Ohio 44087-2245 • www.am.pepperl-fuchs.com
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PEPPERL+FUCHS
Installation Instructions
Anti-interference Measures
Because of the sensitive nature of today’s electronics, a
consistently applied anti-interference and wiring protocol
should be designed into any encoder system. The following
procedures should be followed whenever mounting an
encoder in a normal industrial environment (please note that
no two environments are the same—if you have questions,
please contact your local P+F representative for a detailed
analysis of your application).
• Terminate a serial line with a 120
Ω resistor at the controller
and the last encoder in the loop. The resistor should be
installed between the Receive/Transmit terminals.
• Keep encoder wiring away from power cables and conduit.
If crossing power cables is necessary, make sure the wires
are perpendicular, not parallel.
• Make sure your cable’s shield has a cross section of at
least 12 AWG (4 mm
2
).
• Make sure your cable’s wire has a cross section of at least
26 AWG (0.14 mm
2
).
• Do not kink or bend the cables.
• Do not exceed the minimum bending radius as shown on
the cable data sheet. Avoid tensile and shearing loads on
the cable.
Operating Instructions
Every encoder manufactured by Pepperl+Fuchs is tested
before leaving the factory. To ensure continued operation,
please observe the following precautions:
• Do not strike or hammer on the encoder housing or shaft.
• Do not overload the encoder shaft, either axially or radially.
• The accuracy and service life of the encoder is guaranteed
only if a suitable coupling is used.
• Power to the encoder and controller must be applied at the
same time.
• Do not service wiring with power applied to the system
• Do not exceed maximum operating voltage.
Notes on Electrical Shielding
• Apply shielding on both sides to a common ground.
• The shield has to be installed behind the insulation and
must be clamped to a large surface below the strain relief.
• With screw-type cable connections, the strain relief must
be grounded.
• Use only metallic plugs (such as sub-D plugs with metallic
housings).
Safety Instructions
Please observe the national safety and accident
prevention regulations as well as the subsequent
safety instructions in these operating instructions
when working on encoders.
If failures cannot be remedied, the device must
be shut down and secured against accidental
operation.
Repairs may be carried out only by the
manufacturer.
Entry into and modifications of the device are not
permissible.
Tighten the clamping ring only, if a shaft has been
fitted in the area of the clamping ring (hollow
shaft encoders).
Tighten all screws and plug connectors prior to
operating the encoder.
Warning
Caution
Do not stand on the encoder!
Do not remachine the drive shaft!
Avoid impact!
Do not remachine the housing!